Patent Application
20240294482
The invention relates to the field of organic synthesis, in particular, the invention provides a method for catalytic activating carbon dioxide as a carbonylation reagent by inorganic sulfur.
The development of new green and sustainable organic synthesis methods has attracted more and more attention. Basic components which are pollution-free and recyclable is critical for such methods. Since CO2 is a non-toxic, abdunant and recyclable, it has been regarded as an ideal carbon resource. CO2 is not only the waste gas of fossil fuels, but also a cheap, non-toxic, non-flammable and renewable C1 resource. From the perspective of green chemistry, due to the unique carbonyl structure of CO2, using CO2 as a carbonyl reagent in chemical conversion can provide high value added fine chemicals. Such method could be both an effective way to reduce atmospheric CO2 concentration, and also an important strategy for sustainable energy development. Therefore, it is important to sustainably use CO2 in the synthesis of high value added chemical products.
Among the various organic transformations of CO2, the use of CO2 in carbonylation synthesize to provide heterocyclic structures containing carbonyl groups has attracted increasing attention. CO2 is used to replace carbon source gases which are toxic and unsafety to users such as CO and phosgene. In recent years, remarkable progress had been made on carbonylation of C—H bonds with CO2 due to its' high atomicity and economic value. More importantly, since the carbon valance of CO2 is higher than that of CO, the CO2 can be idealizedly regarded as a combination of CO and an oxidant (CO2=CO+[O]), thus being suitable for carbonylation reactions by redox reactions under neutral conditions, and reducing production costs, heavy metal residues and solve safety hazards.
In summary, there is an urgent need in the art to develop a method for preparing carbonyl compounds using CO2 as a carbon source.
The purpose of the present invention is to develop a method for preparing carbonyl compounds using CO2 as a carbonyl source.
The invention provides a method for preparing carbonyl compounds using CO2 as a carbonylation reagent, wherein H2S is used as a catalyst.
The present invention also provides a method for preparing carbonyl compounds using CO2 as a carbonylation reagent and H2S involved in the reaction, wherein H2S is used as both a catalyst to catalyze the carbonylation reaction and as a reactant in the reaction.
The present invention also provides a method for preparing carbonyl compounds using CO2 as a carbonylation reagent and H2S involved in the reaction, wherein H2S is used as both a catalyst to catalyze the carbonylation reaction and as a reductant in the reaction.
The first aspect of the present invention provides a method for preparing carbonyl compounds using carbon dioxide as a carbonylation reagent, wherein the method is performed in the presence of H2S and optional a base.
In another preferred embodiment, said method comprises the steps (i) or (ii):
R3 is one or more groups on the ring A and selected from the group consisting of: H, halogen, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkyl, NH2, NO2, SO2CH3, and phenyl unsubstituted or substituted with 1-4 substituents selected from the group consisting of: halogen, C1-C6alkyl, C1-C6haloalkyl, C1-C6alkoxy, OH, NO2, NH2, SO2CH3; or R5 and R6 together form a —(CH2)n—, wherein, n is selected from 2, 3, 4, 5 or 6;
In another preferred embodiment, the base is an organic base; preferably, the base is selected from the group consisting of: C1-C12tertiary amines, C1-C12secondary amines, C1-C12primary amines, C2-C12amidines, C2-C12 guanidines, C3-C12 pyridines, C3-C12 imidazoles; preferably, the base is selected from the group consisting of: DBU, TBD, MTBD, DBN, TMG, DABCO, ethylenediamine, triethylamine, DIPEA, DMAP, pyridine, and combinations thereof; preferably, the molar ratio of the reaction substrate to the base is 1:0-5 (e. g., 1:0.1-5).
In another preferred embodiment, the method comprises steps (a), (b), (c), (d), (e), (f) or (g):
In another preferred embodiment, the inert solvent is selected from the group consisting of: NMP, DMF, THF, DMSO, 1,4-dioxane, HMPA, CH2Cl2, CHCl3, CCl4, toluene, ethyl acetate, supercritical CO2, and combinations thereof.
In another preferred embodiment, in the reaction, the molar ratio of the reaction substrate to the CO2 is 1:1-100.
In another preferred embodiment, during the reaction, the CO2 is continuously introduced into the reactor, and the pressure of the CO2 in the reactor is 0.1-12 MPa.
In another preferred embodiment, in the reaction, the molar ratio of the reaction substrate to the H2S is 1:0.05-20.
In another preferred embodiment, during the reaction, the H2S is continuously introduced into the reactor, and the pressure of the H2S in the reactor is 0.05-1.5 MPa.
In another preferred embodiment, in the reaction, the reaction temperature is from room temperature to 150° C.
It should be understood that within the scope of the present invention, the above-described technical features of the present invention and the technical features described in detail below (e.g., embodiments) may be combined with each other to constitute a new or preferred technical solution. Limited to space, I will not repeat them here.
After a long and thorough research, the present inventors unexpectedly found that H2S can be used as a catalyst to catalyze the reaction of CO2 as a carbonyl source with a series of substrates to prepare carbonylated compounds with high efficiency. This carbonylation reaction can occur alone or together with other reactions involving CO2 or H2S to prepare a series of products, which has potential application value in the field of fine chemical synthesis. Based on the above findings, the inventors completed the present invention.
The present invention provides a method for preparing carbonyl compounds using carbon dioxide as a carbonylation reagent, wherein the method is performed in the presence of H2S.H2S can be used as a catalyst only, or as a reactant at the same time as the catalyst, thereby reacting further with the reaction substrate or generating an intermediate.
Specifically, the method comprises step (i) or step (ii):
In a preferred embodiment of the present invention, the step is carried out in the presence of a base, which may preferably be an organic base. Preferably, the base is selected from the group consisting of: C1-C12 tertiary amines, C1-C12 secondary amines, C1-C12 primary amines, C2-C12 amidines, C2-C12 guanidines, C3-C12 pyridines, C3-C12 imidazoles, DBU, TBD, MTBD, DBN, TMG, DABCO, ethylenediamine, triethylamine, DIPEA, DMAP, pyridine, and combinations thereof; preferably, the molar ratio of the reaction substrate to the base is 1:0.1-5.
In the method, a conventional inert solvent that does not affect the reaction may be used, and the preferred solvent includes: NMP, DMF, THF, DMSO, 1,4-dioxane, HMPA, CH2Cl2, CHCl3, CCl4, toluene, ethyl acetate, or a combination thereof. In particular, since the method of the invention requires the use of a CO2 flow, a preferred embodiment is to use supercritical CO2 as a solvent.
The molar ratio of reaction substrate to CO2 in the method is not particularly limited, which can be 1:1-100.
In the reaction process, CO2 is continuously introduced into the reactor. In a preferred reaction method, the pressure of the CO2 in the reactor is 0.1-12 MPa; such as 0.2-10 MPa, 0.5-10 MPa, 0.6-10 MPa, 0.8-8 MPa, or 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa or 6 MPa.
In the reaction, the molar ratio of the reaction substrate to the inorganic sulfur is preferably 1:0.05-20.
In the reaction process, H2S is continuously introduced into the reactor, and preferably the pressure of the H2S in the reactor is 0.08-1.5 MPa, such as 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1 MPa, 1.1 MPa, 1.2 MPa, 1.3 MPa, or 1.4 MPa.
The temperature of the reaction is not particularly limited, and preferably can be carried out at room temperature (typically 0-40° C.) to 150° C., such as 20° C., 30° C., 40° C., 50° C., 60° C., 70° C., 80° C., 90° C., 100° C., 110° C., 120° C., 130° C., or 140° C.
The above reaction can be used to prepare a series of compounds with characteristic structures, for example, compounds with corresponding structural units can be prepared by steps (a), (b), (c), (d), (e) or (f);
In an inert solvent, reacting an o-iodoaniline with CO2 and H2S in the presence of a base to obtain a benzothiazolone derivative. In the above reaction, the base is preferably DABCO, DBU, TBD, or Et3N; more preferably DBU or Et3N. The solvent is preferably NMP or DMF, and the amount of base is preferably 1-3 equivalents. In particular, when the reactant is an organic base or can be used as a solvent, the reaction may also be carried out without a solvent or without an organic base.
In another preferred embodiment, in step (a), the pressure ratio of the CO2 to the H2S is (1-8):(0.1-0.8).
In another preferred embodiment, in step (a), the process is reacted at 70-100° C., preferably 80-90° C.
In another preferred embodiment, in step (a), in the process, the pressure of the CO2 in the reactor is 2-5 MPa, and the pressure of the H2S in the reactor is 0.3-0.5 MPa.
In an inert solvent, reacting an o-nitroiodobenzene with CO2 and H2S in the presence of a base to synthesize a benzothiazolone derivative. In the above reaction, the base is preferably DBU or Et3N; the solvent is preferably NMP or NMP/H2O; and the amount of base is preferably 2-5 equivalents, preferably 2-4 equivalents.
In another preferred embodiment, in step (b), the pressure ratio of CO2 to H2S is (1-8):(0.5-1.5), preferably 2-4:1.
In another preferred embodiment, the reaction may be carried out under CuI catalysis.
In another preferred embodiment, in step (b), the process is reacted at 70-100° C., preferably 80-90° C. In another preferred embodiment, in step (a), in the process, the pressure of the CO2 in the reactor is 2-5 MPa, and the pressure of the H2S in the reactor is 0.5-1 MPa.
In an inert solvent, reacting an propargylamine derivative with CO2 and H2S in the presence of a base to synthesize a thiazolidin-2-one derivative.
In the above reaction, the base is preferably DBU, Et3N, TBD or K2CO3, more preferably DBU, Et3N or TBD; the solvent is preferably CH3OH, DMF, NMP or DMSO, preferably DMSO; and the amount of the base is preferably 0.5-1.5 equivalents, preferably 0.6-1.2 equivalents.
In another preferred embodiment, in step (c), the pressure ratio of the CO2 to the H2S is 1:(0.2-1.5), preferably 1:0.8-1.2.
In another preferred embodiment, in step (c), the process is reacted at 20-60° C., preferably at 20-40° C.
In another preferred embodiment, in step (c), in the process, the pressure of the CO2 in the reactor is 0.8-1.2 MPa, and the pressure of the H2S in the reactor is 0.5-1 MPa (preferably 0.8-1 MPa).
In an inert solvent, reacting an o-aminobenzonitrile with CO2 and H2S in the presence of a base to synthesize a thiobenzamide or a thioquinazolindione derivative; in the reaction, CO2 and H2S are both used as reactants to form a six-membered ring structure. In the above reaction, the base is preferably DBU; the solvent is preferably DMF, and the amount of the base is preferably 0.2-2 equivalents, preferably 0.8-2 equivalents.
In another preferred embodiment, in step (d), the pressure ratio of CO2 to H2S is (2-5):(0.2-1.2), preferably 3-10:1.
In another preferred embodiment, in step (d), the process is reacted at 40-60° C., preferably 45-55° C. In another preferred embodiment, in step (d), in the process, the pressure of the CO2 in the reactor is 2-5 MPa, and the pressure of the H2S in the reactor is 0.4-1 MPa.
In an inert solvent, in the presence of a base, reacting an aromatic o-aminodisulfide with CO2 in the presence of H2S to synthesize a benzothiazolone derivative; in the above reaction, the base is preferably DBU, TMG, or Et3N; the solvent is preferably NMP, CH3OH, 1,4-dioxane, or DMSO, more preferably NMP; the amount of base used is preferably 0.2-2 equivalents, more preferably 0.4-1.2 equivalent.
In another preferred embodiment, in step (e), the pressure ratio of the CO2 to the H2S is (1-5):(0.1-1.2).
In another preferred embodiment, in step (e), the process is reacted at 25-100° C., preferably at 80-90° C.
In another preferred embodiment, in step (e), in the process, the pressure of the CO2 in the reactor is 1-5 MPa, and the pressure of the H2S in the reactor is 0.2-1.0 MPa.
In the above reaction, the base is preferably DABCO, DBU, TMG or Et3N, preferably DBU or TMG; the solvent is preferably NMP, DMF, ethylene glycol or dichloromethane, preferably NMP; and the amount of the base is preferably 0.1-2 equivalents. In particular, when the reactant is an organic base or can be used as a solvent, the reaction may also be carried out without a solvent or without an organic base.
In another preferred embodiment, in step (f), the pressure ratio of CO2 to H2S is (1-65):1.
In another preferred embodiment, in step (f), the process is reacted at 20-60° C., preferably at 30-50° C. In another preferred embodiment, in step (f), in the process, the pressure of the CO2 in the reactor is 1-5 MPa, and the pressure of the H2S in the reactor is 0.05-1.5 MPa.
In the above reaction, the base is preferably DBU, TBD, DIPEA or Et3N, preferably DBU, DIPEA or Et3N; the solvent is preferably NMP, DMF, ethylene glycol or dichloromethane, preferably NMP; and the amount of base is preferably 0.1-1 equivalent, more preferably 0.2-0.6 equivalent. In particular, when the reactant is an organic base or can be used as a solvent, the reaction may also be carried out without a solvent or without an organic base.
In another preferred embodiment, in step (f), the pressure ratio of CO2 to H2S is (3-35):1, preferably (3-25):1.
In another preferred embodiment, in step (f), the process is reacted at 80-120° C.
In another preferred embodiment, in step (f), in the process, the pressure of the CO2 in the reactor is 1-5 MPa, and the pressure of the H2S in the reactor is 0.2-1 MPa.
In the above reaction, the base is preferably DABCO, DBU, TMG, TBD or Et3N, preferably DBU, Et3N, or TMG; the solvent is preferably NMP, DMF, ethylene glycol or dichloromethane, preferably NMP or DMF; and the amount of base is preferably 0.1-2 equivalents.
In particular, when the reactant is an organic base or can be used as a solvent, the reaction may also be carried out without a solvent or without an organic base. In addition, it can also be performed in the absence of solvent when the pressure of CO2 and the reaction temperature are compatible with the conditions for the formation of supercritical CO2.
In another preferred embodiment, in step (f), the pressure ratio of CO2 to H2S is (3-25):1.
In another preferred embodiment, in step (f), the process is reacted at 20-60° C., preferably at 30-50° C.
In another preferred embodiment, in step (f), in the process, the pressure of the CO2 in the reactor is 3-12 MPa, and the pressure of the H2S in the reactor is 0.2-1.0 MPa.
R9 are selected from the group consisting of: H, substituted or unsubstituted C1-C12alkyl (such as substituted or unsubstituted C1-C6alkyl, substituted or unsubstituted C1-C8alkyl), substituted or unsubstituted C3-C8cycloalkyl, phenyl, 5-12-membered heteroaryl, and 5-12-membered saturated or partially unsaturated heterocycle, and the phenyl, heteroaryl or heterocycle is unsubstituted or substituted with 1-4 substituents selected from the group consisting of: halogen, C1-C6alkyl, C1-C6haloalkyl, C1-C6alkoxy, OH, NO2, NH2, and SO2CH3;
In the above reaction, the base is preferably DBU, TMG or Et3N, preferably DBU; the solvent is preferably NMP, DMF or methanol, preferably NMP; the amount of base is preferably 0.1-2 equivalents, however, since the substrate organic amine can be used as a base or solvent, the reaction can also be carried out in the absence of an organic base, and/or in the absence of a solvent.
In another preferred embodiment, in step (f), the pressure ratio of CO2 to H2S is (5-20):1.
In another preferred embodiment, in step (f), the method is reacted at 90-130° C., preferably at 30-50° C.
In another preferred embodiment, in step (f), in the process, the pressure of the CO2 in the reactor is 5-20 MPa, and the pressure of the H2S in the reactor is 0.5-2 MPa.
The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The following embodiments do not indicate the specific conditions of the experimental method, usually according to the conventional conditions, or according to the conditions recommended by the manufacturer. Percentages and servings are calculated by weight unless otherwise stated.
1 mol of o-halogenated aniline, 2 mol of base, 0.2 mol of cuprous iodide (CuI) and 2 ml of solvent were weighed and added into the reactor sequentially and the reactor was tightened. The corresponding amount of H2S was introduced into the reactor, and the reaction was stirred at 90° C. for 30 min, then the corresponding amount of CO2 was introduced into the reactor, and the reaction was continued to be stirred at the corresponding temperature for 24 h. After the reaction, the reactor was cooled to room temperature, and the reactor was opened after the gas in the reactor was slowly exhausted, then the reaction mixture was transferred to a 250 ml partition funnel and extracted with ethyl acetate. The organic phase was dried with anhydrous magnesium sulfate, then separated by column chromatography to obtained the product.
The conditions were optimized according to the above steps, and the reaction results are shown in the following table:
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing solvent, 144 mg of white solid benzothiazolone was obtained with a yield after separation of 95%.
Characterization data of benzothiazol-2-one (2a): 1H NMR (CDCl3, 500 MHz): δ (ppm) 10.01 (brs, 1H), 7.41 (d, 1H, J=7.5 Hz), 7.30-7.26 (m, 1H), 7.17-7.14 (m, 2H). 13C NMR (CDCl3, 125 MHz): δ (ppm) 172.8, 135.3, 126.5, 123.9, 123.3, 122.6, 111.7; MS (EI): m/z calcd for C7H5NOS [M]+: 151.0, found 151.0. m.p.: 139-140° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 138 mg of white solid was obtained with a yield after separation of 84%.
Characterization data of 6-methylbenzothiazol-2-one:1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.75 (brs, 1H), 7.36 (s, 1H), 7.07-7.09 (m, 1H), 7.00(d, 1H, J=8 Hz), 2.30 (s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.8, 133.9, 131.7, 127.0, 123.2, 122.5, 111.1, 20.5; MS (ESI): m/z calcd for C8H7NOS [M+1]+: 166.0, found 165.0. m.p.: 170-171° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, 13 4 mg of white solid was obtained with a yield after separation of 82%.
Characterization data of 5-methylbenzothiazole-2-one:1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.79 (s, 1H), 7.42 (d, J=7.9 Hz, 1H), 6.98-6.91 (m, 2H), 2.32 (s, 3H). 13C NMR (DMSO-d6, 126 MHz) δ (ppm) 170.31, 136.34, 136.04, 123.49, 122.37, 119.95, 111.84, 20.98; MS (ESI): m/z calcd for C8H7NOS [M+1]+: 166.1, found 165.0.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 158 mg of white solid was obtained with a yield after separation of 88%.
Characterization data of 6-methoxybenzothiazol-2-one:1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.66 (brs, 1H), 7.23 (d, 1H, J=2.5 Hz), 7.02 (d, 1H, J=8.5 Hz), 6.86 (dd, 1H, J1=8.5 Hz, J2=2.5 Hz), 3.73(s, 3H); 13C NMR (DMSO-d6, 126 MHz): δ (ppm) 169.8, 155.2, 129.9, 124.3, 113.2, 112.1, 107.8, 55.6; MS (ESI): m/z calcd for C8H7NO2S [M+1]+: 182.1, found 181.1.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 144 mg of white solid was obtained with a yield after separation of 85%.
Characterization data of 6-fluorobenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 11.91 (s, 1H), 7.57 (ddt, J=9.1, 2.2, 0.8 Hz, 1H), 7.16-7.08 (m, 2H). 13C NMR (DMSO-d6, 126 MHz) δ (ppm) 169.83, 157.89 (d, J=119.3 Hz), 132.85 (d, J=1.9 Hz), 124.66 (d, J=5.5 Hz), 113.55 (d, J=12.0 Hz), 112.38 (d, J=4.3 Hz), 109.95 (d, J=13.7 Hz). MS (ESI): m/z calcd for C7HFNOS [M+1]+: 170.1, found 169.1.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 175 mg of white solid was obtained with a yield after separation of 81%.
Characterization data of 6-trifluoromethylbenzothiazol-2-one: 1H NMR (DMSO-d 6,500 MHz): δ (ppm) 12.22 (brs, 1H), 7.85 (d, 1H, J=8.5 Hz), 7.48 (dd, 1H, J1=8.0 Hz, J2=1.0 Hz), 7.33 (d, 1H, J=1.5 Hz); 13C NMR (DMSO-d 6, 125 MHz): δ (ppm) 169.7, 136.7, 128.4 (d, J=1.25 Hz), 126.9 (q, J=31.9.5 Hz), 124.0 (q, J=270.5 Hz), 123.8, 119.0 (q, J=3.9 Hz), 107.6 (q, J=4.1 Hz); MS (EI): M/z calcd for C8H4F3NOS [M+1]+: 220.0, found 219.0. m.p .: 216-218° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 144 mg of white solid was obtained with a yield after separation of 63%.
Characterization data of 6-bromobenzothiazol-2-one: 1H NMR (DMSO-d6, 500 MHZ): δ (ppm) 12.02 (brs, 1H), 7.86 (d, 1H, J=2.0 Hz), 7.44 (dd, 1H, J1=8.5, J2=2.5 Hz), 7.05 (d, 1H, J=8.5 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 135.6, 129.2, 125.6, 125.0, 114.0, 113.1; MS (EI): m/z calcd for C7H4BrNOS [M+1]+: 229.9, found 228.9. m.p. : 231-232° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=100:3 as developing agent, 121 mg of white solid was obtained with a yield after separation of 66%.
Characterization data of 6-chlorobenzothiazol-2-one: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.02 (brs, 1H), 7.74 (d, 1H, J=2.0 Hz), 7.32 (dd, 1H, J1=8.5, J2=2.5 Hz), 7.11 (d, 1H, J=8.5 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 135.3, 126.4, 125.2, 122.4, 122.7; MS (ESI): m/z calcd for C7H4ClNOS [M+1]+: 186.0, found 185.0. m.p. : 212-214° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=100:3 as developing agent, 124 mg of white solid was obtained with a yield after separation of 76%.
Characterization data of 2-methylbenzothiazole -2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 7.64 (d, J=7.8 Hz, 1H), 7.39 (t, J=7.7 Hz, 1H), 7.30 (d, J=8.1 Hz, 1H), 7.21 (t, J=7.6 Hz, 1H), 3.41 (s, 3H). 13C NMR (126 MHz, DMSO-d6) δ (ppm)137.61, 126.60, 123.17, 122.70, 121.28, 111.32.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 110 mg of white solid was obtained with a yield after separation of 67%.
Characterization data of 6-aminobenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 11.34 (s, 1H), 6.80 (d, J=8.4 Hz, 1H), 6.69 (d, J=2.2 Hz, 1H), 6.51 (dd, J=8.4, 2.3 Hz, 1H), 4.94 (s, 2H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 169.31, 144.70, 126.35, 124.07, 112.92, 111.98, 107.03. MS (ESI): m/z calcd for C7H6N2OS [M+1]+: 167.1, found 166.1.
The reaction method was as follows:
1 mmol of o-halogenated nitrobenzene, 2 mmol of base, 0.2 mmol of cuprous iodide (CuI) and 2 ml of solvent were weighed and added to the reactor sequentially and the reactor was tightened. The corresponding amount of H2S was introduced into the reactor, and the reaction was stirred at the corresponding temperature for 30 min, then the corresponding amount of CO2 was introduced into the reactor, and the reaction was continued to be stirred at the corresponding temperature for 24 h. After the reaction, the reactor was cooled to room temperature, and the reactor was opened after the gas in the reactor was slowly exhausted, then the reaction mixture was transferred to a 250 ml partition funnel and extracted with ethyl acetate. The organic phase was dried with anhydrous magnesium sulfate, and separated by column chromatography to obtain the product.
The conditions were optimized according to the above steps, and the reaction results were shown in the following table:
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 117 mg of white solid was obtained with a yield after separation of 71%.
Characterization data of 5-methylbenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 11.80 (s, 1H), 7.42 (d, J=7.9 Hz, 1H), 6.97-6.92 (m, 2H), 2.32 (s, 3H). 13C NMR (126 MHz, DMSO-d6) δ (ppm)170.35, 136.35, 136.06, 123.52, 122.39, 119.97, 111.87, 21.00; MS (ESI): m/z calcd for C8H7NOS [M+1]+: 166.0, found 165.0.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 117 mg of white solid was obtained with a yield after separation of 71%.
Characterization data of 7-methylbenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ 11.87 (s, 1H), 7.20 (t, J=7.8 Hz, 1H), 6.97 (dd, J=7.7, 5.0 Hz, 2H), 2.28 (s, 3H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 169.57, 136.09, 131.62, 126.25, 123.07, 122.98, 109.03, 19.70; MS (ESI): m/z calcd for C8H7NOS [M+1]+: 166.0, found 165.0.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 127 mg of white solid was obtained with a yield after separation of 70%.
Characterization data of 5-methoxybenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm)11.80 (s, 1H), 7.44 (d, J=8.7 Hz, 1H), 6.74 (dd, J=8.7, 2.5 Hz, 1H), 6.66 (d, J=2.5 Hz, 1H), 3.75 (s, 3H). 13C NMR (126 MHz, DMSO-d6) δ (ppm)170.91, 158.48, 137.27, 123.40, 114.19, 109.48, 97.39, 55.39; MS (ESI): m/z calcd for C8H7NO2S [M+1]+: 182.1, found 181.1.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 140 mg of white solid was obtained with a yield after separation of 67%.
Characterization data of 5-methyl ester benzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 12.14 (s, 1H), 7.75-7.68 (m, 3H), 7.63 (s, 1H), 3.87 (s, 4H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 169.69, 165.75, 136.52, 129.31, 127.63, 123.14, 122.96, 111.50, 111.46, 52.29. MS (ESI): m/z calcd for C9H7NO3S [M+1]+: 220.0, found 219.0.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=5:1 as developing agent, 116 mg of white solid was obtained with a yield after separation of 63%.
Characterization data of 7-chlorobenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 12.22 (s, 1H), 7.33 (t, J=8.0 Hz, 1H), 7.26 (d, J=7.1 Hz, 1H), 7.11 (d, J=7.9 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 168.56, 137.50, 127.83, 126.19, 122.61, 122.19, 110.34, 110.30, 109.54; MS (ESI): m/z calcd for C7H4ClNOS [M+1]+: 186.0, found 185.0.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 126 mg of white solid was obtained with a yield after separation of 75%.
Characterization data of 5-fluorobenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 12.02 (s, 1H), 7.60 (dd, J=8.7, 5.4 Hz, 1H), 7.00 (td, J=9.1, 2.6 Hz, 1H), 6.93 (dd, J=9.3, 2.6 Hz, 1H). 13C NMR (DMSO-d6, 126 MHz) δ (ppm) 170.68, 161.02 (d, J=57.9 Hz), 137.31 (d, J=6.1 Hz), 124.17 (d, J=4.8 Hz), 118.72 (d, J=1.2 Hz), 109.74 (d, J=11.7 Hz), 99.22 (d, J=13.7 Hz). MS (EI): m/z calcd for C7H5NOS [M]+: 169.0, found 169.0. m.p.: 172-174° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 118 mg of white solid was obtained with a yield after separation of 64%.
Characterization data of 5-chlorobenzothiazole-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 12.05 (s, 1H), 7.61 (d, J=8.4 Hz, 1H), 7.19 (dd, J=8.4, 2.1 Hz, 1H), 7.12 (s, 1H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 170.12, 137.47, 130.83, 124.26, 122.45, 122.22, 122.19, 111.24; MS (ESI): m/z calcd for C7H4ClNOS [m+1]+: 186.0, found 185.0. m.p.: 224-226° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, 154 mg of white solid was obtained with a yield after separation of 67%.
Characterization data of 5-bromobenzothiazol-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 12.04 (s, 1H), 7.56 (d, J=8.4 Hz, 1H), 7.31 (dd, J=8.4, 2.0 Hz, 1H), 7.24 (d, J=1.9 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 169.91, 137.70, 125.20, 124.59, 122.71, 118.74, 113.96; MS (ESI): m/z calcd for C7H4BrNOS [M+1]+: 229.9, found 228.9.
2 mmol of propargylamine, 1.2 mmol of base and 2 mL of solvent were added into a 10 mL reactor, a magnet was placed and the reactor was tightened. After the air in the reactor was replaced with N2 gas for three times, the corresponding amount of H2S was introduced, and stirred until the pressure was stabilized. 1 MPa CO2 was introduced, and the reaction was stirred at the corresponding temperature for 24 h. The reaction mixture was extracted with ethyl acetate after the reaction was completed, then the organic phase was collected and combined, dried with anhydrous magnesium sulfate for 30 min, filtered to remove the desiccant, and the solvent was removed under reduced pressure to obtain the crude product. The crude product was purified by column chromatography (eluent: petroleum ether/ethyl acetate or dichloromethane/methanol) to obtain the target product.
The conditions were optimized according to the above steps, and the results are shown in the following table:
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=1:2 as developing agent, the yield after separation was 24%.
5-methylenethiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 6.53 (s, 1H), 5.23 (q, J=2.2 Hz, 1H), 5.18-5.11 (m, 1H), 4.31 (s, 2H) ppm; 13C NMR (125 MHz, CDCl3) δ 173.1, 138.8, 106.9, 49.4 ppm; HRMS(ESI) m/z:[M+H]+ Calcd for C4H5NOS 116.0165; Found 116.0167.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 81%.
4,4-dimethyl-5-methylenethiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 6.32 (s, 1H), 5.19 (d, J=2.2 Hz, 1H), 5.11-5.06 (m, 1H), 1.50 (s, 6H) ppm; 13C NMR (125 MHz, CDCl3) δ 169.7, 149.3, 104.9, 62.7, 29.9 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C6H9NOS 144.0478; Found 144.0474
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:methanol (V/V)=200:1 as developing agent, the yield after separation was 80%.
(Z)-5-benzylidene-3-butyl-4,4-diethylthiazolidin-2-one:1H NMR (500 MHz, CDCl3) δ 7.40-7.31 (m, 4H), 7.25-7.21 (m, 1H), 6.39 (s, 1H), 3.21-3.14 (m, 2H), 1.95-1.83 (m, 2H), 1.78-1.69 (m, 2H), 1.69-1.63 (m, 2H), 1.41-1.32 (m, 2H), 0.96 (t, J=7.4 Hz, 3H), 0.86 (t, J=7.2 Hz, 6H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.8, 136.4, 136.3, 128.8, 128.1, 127.1, 118.2, 75.9, 42.6, 34.1, 31.0, 20.8, 13.9, 7.8 ppm; HRMS(ESI) m/z:[M+H]+ Calcd for C18H25NOS 304.1730; Found 304.1725.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 92%.
(Z)-4-benzylidene-1-butyl-3-thia-1-azaspiro[4.5]decan-2-one: 1H NMR (500 MHz, CDCl3) δ 7.40-7.30 (m, 4H), 7.28-7.22 (m, 1H), 6.96 (s, 1H), 3.29-3.21 (m, 2H), 2.07 (d, J=10.4 Hz, 2H), 1.87-1.72 (m, 7H), 1.63-1.50 (m, 2H), 1.40-1.25 (m, 3H), 0.94 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.1, 139.6, 136.3, 128.6, 128.5, 127.5, 122.7, 69.7, 42.4, 33.7, 32.2, 24.7, 22.8, 20.5, 13.9 ppm; HRMS(ESI) m/z:[M+H]+ Calcd for C19H25NOS 316.1730; Found 316.1722.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=3:1 as developing agent, the yield after separation was 92%.
(Z)-5-benzylidene-3-butyl-4-phenylthiazolidin-2-one: According to general procedure, the crude residue was purified by flash chromatography (PE/EA=3/1) to give the product as a yellow solid (589 mg, 91%). m.p.=83-86° C.; 1H NMR (500 MHz, CDCl3) δ 7.45-7.37 (m, 5H), 7.35-7.30 (m, 2H), 7.25-7.19 (m, 3H), 6.31 (s, 1H), 5.48 (s, 1H), 3.76-3.65 (m, 1H), 2.77-2.65 (m, 1H), 1.53-1.42 (m, 2H), 1.33-1.23 (m, 2H), 0.88 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.0, 139.4, 135.7, 132.4, 129.4, 129.1, 128.7, 128.1, 127.4, 123.3, 69.9, 42.9, 29.2, 20.0, 13.8 ppm; HRMS(ESI) m/z:[M+H]+Calcd for C20H21NOS 324.1417; Found 324.1409.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 99%.
(Z)-4-benzyl-5-benzylidene-3-butylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.33 (t, J=7.6 Hz, 2H), 7.29-7.20 (m, 4H), 7.19-7.11 (m, 4H), 6.07 (s, 1H), 4.69-4.49 (m, 1H), 3.92 (dt, J=14.5, 8.0 Hz, 1H), 3.13 (dd, J=13.6, 4.1 Hz, 1H), 3.10-2.98 (m, 2H), 1.69-1.55 (m, 2H), 1.41-1.29 (m, 2H), 0.95 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.1, 135.4, 135.2, 131.0, 129.9, 128.6, 128.5, 127.9, 127.3, 127.1, 122.4, 66.6, 42.5, 40.5, 29.6, 20.0, 13.7 ppm; HRMS(ESI) m/z:[M+H]+ Calcd for C21H23NOS 338.1573; Found 338.1542.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 90%.
(Z)-5-benzylidene-3-butyl-4-propylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.37 (t, J=7.7 Hz, 2H), 7.31 (d, J=7.3 Hz, 2H), 7.23 (d, J=7.3 Hz, 1H), 6.49 (s, 1H), 4.56 (s, 1H), 3.85-3.74 (m, 1H), 3.05-2.93 (m, 1H), 1.97-1.87 (m, 1H), 1.79-1.68 (m, 1H), 1.66-1.49 (m, 2H), 1.47-1.30 (m, 4H), 0.95 (t, J=7.4 Hz, 6H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.1, 135.8, 132.5, 128.8, 128.1, 127.3, 121.1, 65.2, 42.3, 36.4, 29.6, 20.1, 16.1, 14.1, 13.9 ppm; HRMS(ESI) m/z:[M+H]+ Calcd for C17H23NOS 290.1573; Found 290.1558.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 92%.
(Z)-3-butyl-4,4-dimethyl-5-(4-methylbenzylidene)thiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.23 (d, J=8.2 Hz, 2H), 7.17 (d, J=8.0 Hz, 2H), 6.50 (s, 1H), 3.29-3.23 (m, 2H), 2.34 (s, 3H), 1.68-1.59 (m, 2H), 1.55 (s, 6H), 1.41-1.31 (m, 2H), 0.95 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 167.1, 138.3, 137.1, 133.3, 129.4, 128.1, 119.0, 68.0, 42.5, 31.7, 28.3, 21.3, 20.5, 13.9 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C17H23NOS 290.1573; Found 290.1568.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 81%.
(Z)-3-butyl-5-(4-methoxybenzylidene)-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.27 (d, J=10.5 Hz, 2H), 6.90 (d, J=8.8 Hz, 2H), 6.47 (s, 1H), 3.82 (s, 3H), 3.29-3.22 (m, 2H), 1.68-1.60 (m, 2H), 1.54 (s, 6H), 1.40-1.31 (m, 2H), 0.95 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 167.2, 158.7, 136.9, 129.5, 128.9, 118.6, 114.2, 68.0, 55.4, 42.5, 31.7, 28.3, 20.5, 13.9 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C17H23NO2S 306.1522; Found 306.1516.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 83%.
(Z)-3-butyl-5-(4-chlorobenzylidene)-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.33 (d, J=8.5 Hz, 2H), 7.26 (d, J=8.7 Hz, 2H), 6.47 (s, 1H), 3.30-3.23 (m, 2H), 1.68 - 1.60 (m, 2H), 1.55 (s, 6H), 1.42 - 1.31 (m, 2H), 0.95 (t, J=7.3 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.5, 140.5, 134.7, 132.8, 129.4, 128.9, 117.8, 68.1, 42.6, 31.7, 28.3, 20.5, 13.9 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C16H20ClNOS 310.1027; Found 310.1021.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=1:2 as developing agent, the yield after separation was 87%.
(Z)-5-benzylidene-4.4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, DMSO-d6) δ 8.79 (s, 1H), 7.43-7.33 (m, 4H), 7.25 (t, J=7.3 Hz, 1H), 6.74 (s, 1H), 1.50 (s, 6H) ppm; 13C NMR (125 MHz, DMSO-d6) δ 166.1, 140.8, 136.0, 128.6, 127.7, 126.9, 118.7, 63.5, 29.7 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C12H13NOS 220.0791; Found 220.0788.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 94%.
(Z)-5-benzylidene-4,4-dimethyl-3-propylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) 1 δ 7.41-7.29 (m, 4H), 7.25-7.21 (m, 1H), 6.53 (s, 1H), 3.27-3.16 (m, 2H), 1.74-1.63 (m, 2H), 1.56 (s, 6H), 0.94 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.9, 139.3, 136.0, 128.6, 128.0, 127.1, 118.9, 67.9, 44.2, 28.2, 22.7, 11.5 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C15H19NOS 262.1260; Found 262.1257.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 87%.
(Z)-5-benzylidene-3-butyl-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.39-7.31 (m, 4H), 7.25-7.21 (m, 1H), 6.53 (s, 1H), 3.30-3.24 (m, 2H), 1.69-1.60 (m, 2H), 1.56 (s, 6H), 1.41-1.32 (m, 2H), 0.95 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.9, 139.6, 136.2, 128.7, 128.2, 127.3, 119.0, 68.1, 42.5, 31.7, 28.4, 20.6, 13.9 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C16H21NOS 276.1417; Found 276.1416.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 89%.
(Z)-3-benzyl-5-benzylidene-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.40-7.33 (m, 4H), 7.32-7.29 (m, 4H), 7.27-7.23 (m, 2H), 6.53 (s, 1H), 4.62 (s, 2H), 1.49 (s, 6H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.1, 139.1, 138.1, 136.0, 128.8, 128.7, 128.2, 127.5, 127.4, 127.3, 119.3, 68.4, 45.3, 28.5 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C19H19NOS 310.1260; Found 310.1250.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 46%.
(Z)-5-benzylidene-3-isopropyl-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.40-7.31 (m, 4H), 7.25-7.20 (m, 1H), 6.46 (s, 1H), 3.58-3.47 (m, 1H), 1.56 (s, 6H), 1.49 (d, J=6.8 Hz, 6H) ppm; 13C NMR (125 MHz, CDCl3) δ 165.6, 139.8, 136.3, 128.7, 128.2, 127.1, 118.8, 69.1, 47.7, 28.3, 20.5 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C15H19NOS 262.1260; Found 262.1256
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 75%.
(Z)-5-(4-bromobenzylidene)-3-butyl-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.49 (d, J=8.5 Hz, 2H), 7.20 (d, J=8.6 Hz, 2H), 6.45 (s, 1H), 3.29-3.24 (m, 2H), 1.68-1.60 (m, 2H), 1.55 (s, 6H), 1.40-1.32 (m, 2H), 0.95 (td, J=7.4, 1.1 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.5, 140.7, 135.1, 131.9, 129.7, 121.0, 117.9, 68.1, 42.6, 31.7, 28.3, 20.6, 13.9 ppm; MS(ESI) m/z: [M+H]+ Calcd for C16H20BrNOS 354.1; Found 354.1.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether: ethyl acetate (V/V)=1:3 as developing agent, the yield after separation was 79%.
(Z)-3-butyl-4.4-dimethyl-5-(pyridin-3-ylmethylene)thiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 8.52 (d, J=55.4 Hz, 2H), 7.70 (d, J=7.5 Hz, 1H), 7.32 (s, 1H), 6.49 (s, 1H), 3.31-3.24 (m, 2H), 1.66-1.63 (m, 2H), 1.58 (s, 6H), 1.41-1.32 (m, 2H), 0.95 (t, J=7.3 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.1, 150.1, 147.9, 142.9, 134.2, 115.4, 68.3, 42.7, 31.7, 28.4, 20.5, 13.9 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C15H22N2OS 277.1369; Found 277.1376.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 82%.
(Z)-3-butyl-4,4-dimethyl-5-(thiophen-2-ylmethylene)thiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.33 (d, J=5.0 Hz, 1H), 7.07-7.04 (m, 1H), 7.02 (d, J=3.1 Hz, 1H), 6.74 (s, 1H), 3.29-3.23 (m, 2H), 1.66-1.61 (m, 2H), 1.54 (s, 6H), 1.40-1.31 (m, 2H), 0.95 (t, J=7.4 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.4, 140.2, 137.9, 127.5, 126.6, 126.0, 112.0, 67.7, 42.7, 31.7, 28.3, 20.5, 13.9 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C14H19NOS2 282.0981; Found 282.0981.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 40%.
(Z)-3-butyl-5-(cyclopropylmethylene)-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 4.99 (d, J=8.8 Hz, 1H), 3.22-3.14 (m, 2H), 1.63-1.55 (m, 2H), 1.39 (s, 6H), 1.37-1.28 (m, 3H), 1.23-1.16 (m, 1H), 0.92 (t, J=7.4 Hz, 3H), 0.85-0.78 (m, 2H), 0.44-0.39 (m, 2H) ppm; 13C NMR (125 MHz, CDCl3) δ 167.5, 136.9, 122.9, 66.4, 42.3, 31.8, 28.0, 20.5, 13.9, 13.1, 7.3 ppm; MS(ESI) m/z: [M+H]+ Calcd for C13H21NOS 240.1; Found 240.2.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 72%.
(Z)-5-benzylidene-3-cyclopropyl-4.4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.39-7.31 (m, 4H), 7.25-7.21 (m, 1H), 6.54 (s, 1H), 2.39-2.33 (m, 1H), 1.67 (s, 6H), 0.99-0.94 (m, 2H), 0.93-0.88 (m, 2H) ppm. 13C NMR (125 MHz, CDCl3) δ 168.8, 138.9, 136.1, 128.7, 128.2, 127.3, 119.0, 69.6, 28.3, 24.3, 6.4 ppm; MS(ESI) m/z: [M+H]+ Calcd for C15H17NOS 260.1; Found 260.2.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 85%.
(Z)-5-benzylidene-3-hexyl-4,4-dimethylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.39-7.32 (m, 4H), 7.26-7.21 (m, 1H), 6.53 (s, 1H), 3.29-3.22 (m, 2H), 1.69-1.62 (m, 2H), 1.56 (s, 6H), 1.38-1.28 (m, 6H), 0.89 (t, J=6.3 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.9, 139.5, 136.2, 128.7, 128.2, 127.2, 119.0, 68.1, 42.7, 31.6, 29.6, 28.4, 27.0, 22.72, 14.1 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C18H25NOS 304.1730; Found 304.1734.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=2:1 as developing agent, the yield after separation was 86%.
(Z)-5-benzylidene-4,4-dimethyl-3-octylthiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.40-7.31 (m, 4H), 7.26-7.21 (m, 1H), 6.53 (s, 1H), 3.28-3.23 (m, 2H), 1.70-1.62 (m, 2H), 1.56 (s, 6H), 1.34-1.23 (m, 10H), 0.88 (t, J=6.7 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 166.9, 139.5, 136.2, 128.7, 128.2, 127.3, 119.0, 68.1, 42.8, 31.9, 29.7, 29.3(9), 29.3(7), 28.4, 27.3, 22.8, 14.2 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C20H29NOS 332.2043; Found 332.2049.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=5:1 as developing agent, the yield after separation was 35%.
3-benzyl-5-methylenethiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.39-7.34 (m, 2H), 7.33-7.29 (m, 1H), 7.27 (d, J=7.9 Hz, 2H), 5.17-5.14 (m, 1H), 5.14-5.11 (m, 1H), 4.53 (s, 2H), 4.17-4.13 (m, 2H) ppm. 13C NMR (125 MHz, CDCl3) δ 169.1, 135.5, 135.4, 129.0, 128.3, 128.2, 106.6, 53.9, 48.3 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C4H5NOS: 206.1; Found 206.0.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 94%.
(Z)-5-benzylidene-3-hexyl-4-(p-tolyl)thiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.31 (t, J=7.7 Hz, 2H), 7.25 (d, J=3.1 Hz, 2H), 7.24-7.17 (m, 5H), 6.28 (s, 1H), 5.43 (s, 1H), 3.73-3.65 (m, 1H), 2.74-2.66 (m, 1H), 2.37 (s, 3H), 1.51-1.43 (m, 2H), 1.33-1.21 (m, 2H), 0.88 (t, J=7.3 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.0, 139.0, 136.4, 135.8, 132.7, 130.0, 128.7, 128.1, 127.3(3), 127.3(1), 123.1, 69.7, 42.8, 29.2, 21.4, 20.1, 13.8 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C21H23NOS 338.1573; Found 338.1578.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 66%.
(Z)-5-benzylidene-3-butyl-4-(4-chlorophenyl)thiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.40 (d, J=8.3 Hz, 2H), 7.33 (d, J=8.2 Hz, 4H), 7.23 (d, J=7.6 Hz, 3H), 6.28 (s, 1H), 5.45 (s, 1H), 3.71 (dt, J=15.4, 7.9 Hz, 1H), 2.73-2.66 (m, 1H), 1.51-1.42 (m, 2H), 1.34-1.21 (m, 2H), 0.89 (t, J=7.3 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 168.0, 138.0, 135.5, 135.1, 131.9, 129.7, 128.7, 128.7, 128.1, 127.6, 123.6, 69.1, 42.9, 29.2, 20.0, 13.8 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C20H20ClNOS 358.1027; Found 358.1031.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): petroleum ether:ethyl acetate (V/V)=4:1 as developing agent, the yield after separation was 83%.
(Z)-5-benzylidene-3-butyl-4-(thiophen-3-yl)thiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 7.39-7.31 (m, 4H), 7.22 (dd, J=13.3, 5.9 Hz, 2H), 7.08 (d, J=6.1 Hz, 1H), 6.34 (s, 1H), 5.61 (s, 1H), 3.71-3.63 (m, 1H), 2.84-2.76 (m, 1H), 1.53-1.40 (m, 2H), 1.34-1.22 (m, 3H), 0.89 (t, J=7.3 Hz, 3H) ppm; 13C NMR (125 MHz, CDCl3) δ 167.6, 140.2, 135.7, 131.5, 128.7, 128.1(3), 128.1(2), 127.9, 127.4, 125.8, 124.0, 123.2, 65.4, 42.9, 29.3, 20.1, 13.8 ppm; HRMS(ESI) m/z: [M+H]+ Calcd for C18H19NOS2 330.0981; Found 330.0981.
2 mmol of o-phenylenediamine, organic base and 1 mL of suitable solvent were added sequentially into a 15 mL high-pressure reactor, and the reactor was tightened; the required amount of H2S and CO2 gas was sequentially introduced into the reactor; finally, the mixture was continuously reacted at a suitable temperature for 12 hours; after the reaction was completed, a certain amount of distilled water was added to the reaction mixture to precipitate the product completely, and then filtered and dried sequentially to obtain the product.
The conditions were optimized according to the above steps, and the results are shown in the following table:
233 mg of white solid product was obtained by filtration and drying, separation yield: 87%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.57 (s, 2H), 6.91 (s, 4H).
13C NMR (126 MHz, DMSO-d6, TMS): δ (ppm) 155.28(C), 129.67(C), 120.43(CH), 108.46(CH).
MS (ESI): m/z calcd for C7H6NO[M+H]+: 135.06, found 135.1.
265 mg of solid product was obtained by filtration and drying, separation yield: 89.5%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.47 (d, 2H, J=20.0 Hz), 6.80 (d, 1H, J=10.0 Hz), 6.73 (d, 2H, J=10.0 Hz), 2.27 (s, 3H).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 155.29, 129.72, 129.21, 127.31, 120.75, 108.87, 108.03, 20.91.
266 mg of solid product, was obtained by filtration and drying, separation yield: 90%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.65 (s, 1H), 10.53 (s, 1H), 6.82 (t, 1H, J1=J2=10.0 Hz), 6.74(t, 1H, J1=J2=10.0 Hz), 2.25 (s, 3H).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 155.47, 129.23, 128.55, 121.56, 120.34, 117.13, 106.05, 16.17.
289 mg of solid product, was obtained by filtration and drying, separation yield: 89.2%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.34 (s, 2H), 6.70 (s, 2H), 2.17 (s, 6H).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 155.41, 127.75, 109.54.
176 mg of solid product, was obtained by filtration and drying, separation yield: 58%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.74 (s, 1H), 10.63 (s, 1H), 6.87 (dd, J=8.5, 4.7 Hz, 1H), 6.80-6.69 (m, 2H).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 158.42, 156.13(d, J=110.2 Hz), 130.36(d, J=13.0 Hz), 126.06, 108.77(d, J=9.6 Hz), 106.52(d, J=23.8 Hz), 96.51(d, J=28.2 Hz).
264 mg of solid product, was obtained by filtration and drying, separation yield: 78%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.76 (s, 2H), 6.97-6.90 (m, 3H).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 155.19, 130.82, 128.60, 124.47, 120.09, 109.50, 108.36.
421 mg of solid product, was obtained by filtration and drying, separation yield: 98.7%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.76 (s, 2H), 7.05 (t, 2H, J1=J2=10.0 Hz), 6.88 (d, 1H, J=10.0 Hz).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 155.03, 131.20, 128.98, 122.89, 111.98, 111.02, 110.06.
255 mg of solid product, was obtained by filtration and drying, separation yield: 63%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.99 (s, 2H), 7.28 (dd, J=8.2, 1.7 Hz, 1H), 7.16 (d, J=1.7 Hz, 1H), 7.09 (d, J=8.1 Hz, 1H).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 155.36, 132.88, 129.85, 124.89(q, J=271.8 Hz), 120.95(q, J=3.2 Hz), 117.91(q, J=4.2 Hz), 108.58, 104.98(q, J=4.0 Hz).
371 mg of solid product, was obtained by filtration and drying, separation yield: 78%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 11.11 (s, 1H), 10.88 (s, 1H), 7.70-7.63 (m,3H), 7.55 (t, 2H, J1=J2=5.0 Hz), 7.44 (d, 1H, J=10.0 Hz), 7.33 (s, 1H), 7.08 (d, 1H, J=10.0 Hz).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 194.98, 155.38, 138.19, 134.02, 131.81, 129.66. 129.38. 129.17. 128.34, 124.44, 109.71, 107.98.
206 mg of solid product, was obtained by filtration and drying, separation yield: 63%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.50 (s, 1H), 10.37 (s, 1H), 6.81 (d, 1H, J=5.0 Hz), 6.52 (d, 2H, J=10.0 Hz), 3.70 (s, 3H).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 155.64, 154.33, 130.49, 123.56, 108.71, 106.07, 95.27, 55.42.
358 mg of solid product, was obtained by filtration and drying, separation yield: 97%
1H NMR (500 MHz, DMSO-d6, TMS): δ (ppm) 10.07 (s, 2H), 7.21 (t, 2H, J1=J2=5.0 Hz), 7.11 (d, 2H, J=5.0 Hz), 6.52 (d, 2H, J=5.0 Hz).
13C NMR (125 MHz, DMSO-d6, TMS): δ (ppm) 150.09, 137.67, 134.15, 128.03, 117.65, 113.66, 104.01.
2 mmol of the o-aminothiophenol was placed in a 15 mL stainless steel autoclave equipped with magnet stirrer, and then 2 mmol of base and 2 mL of solvent were added to the autoclave in order, and the autoclave was tightened. The corresponding amount of H2S was introduced, then the corresponding amount of CO2 was introduced. And the reaction mixture was stirred vigorously at the reaction temperature for 24 h. Upon completion, the autoclave was cooled down to room temperature and slowly depressurized. The solution was extracted with ethyl acetate, and the organic phases were combined and dried with anhydrous magnesium sulfate. The desiccant was removed by filtration and the solvent was removed under reduced pressure to obtain the crude product, which was purified by column chromatography to obtain the target product.
The conditions were optimized according to the above steps, and the results were shown in the following table:
1:0.5
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 143 mg of white solid was obtained with a yield after separation of 94.4%.
Characterization data of benzothiazol-2-one (1a):1H NMR (CDCl3, 500 MHz): δ (ppm) 10.01 (brs, 1H), 7.41 (d, 1H, J=7.5 Hz), 7.30-7.26 (m, 1H), 7.17-7.14 (m, 2H). 13C NMR (CDCl3, 125 MHz): δ (ppm) 172.8, 135.3, 126.5, 123.9, 123.3, 122.6, 111.7; MS (EI): m/z calcd for C7H5NOS [M]+: 151.0, found 151.0. m.p.: 139-140° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=5:1 as developing agent, 141 mg of white solid was obtained with a yield after separation of 76.2%.
Characterization data of 6-chlorobenzothiazole-2-one (1b):1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.02 (brs, 1H), 7.74 (d, 1H, J=2.0Hz), 7.32 (dd, 1H, J1=8.5, J2=2.5 Hz), 7.11 (d, 1H, J=8.5 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 135.3, 126.4, 125.2, 122.4, 122.7; MS (EI): m/z calcd for C7H4ClNOS [M]+: 185.1, found 185.0. m.p.: 212-214° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 195 mg of white solid was obtained with a yield after separation of 85%.
Characterization data of 6-bromobenzothiazole-2-one (1c):1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.02 (brs, 1H), 7.86 (d, 1H, J=2.0 Hz), 7.44 (dd, 1H, J1=8.5, J2=2.5 Hz), 7.05 (d, 1H, J=8.5 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 135.6, 129.2, 125.6, 125.0, 114.0, 113.1; MS (EI): m/z calcd for C7H4BrNOS [M]+: 228.9, found 228.9. m.p.: 231-232° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 149 mg of white solid was obtained with a yield after separation of 67.9%.
Characterization data of 6-trifluoromethylbenzothiazole-2-one (1d): 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.22 (brs, 1H), 7.85 (d, 1H, J=8.5 Hz), 7.48 (dd, 1H, J1=8.0 Hz, J2=1.0 Hz), 7.33 (d, 1H, J=1.5 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 136.7, 128.4 (d, J=1.25 Hz), 126.9 (q, J=31.9.5 Hz), 124.0 (q, J=270.5 Hz), 123.8, 119.0 (q, J=3.9 Hz), 107.6 (q, J=4.1 Hz); MS (EI): m/z calcd for C8H4F3NOS [m]+: 219.2, found 219.0. m.p.: 216-218° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=10:1 as developing agent, 170 mg of white solid was obtained with a yield after separation of 94%.
Characterization data of 6-methoxybenzothiazole-2-one (1e): 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.658 (brs, 1H), 7.23 (d, 1H, J=2.5 Hz), 7.02 (d, 1H, J=8.5 Hz), 6.86 (dd, 1H, J1=8.5 Hz, J2=2.5 Hz), 3.73(s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.8, 155.2, 129.9, 124.3, 113.2, 112.1, 107.8, 55.6; MS (EI): M/z calcd for C8H7NO2S [M]+: 180.9, found 181.0. m.p.: 161-163° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=50:1 as developing agent, 160 mg of white solid was obtained with a yield after separation of 96.8%.
Characterization data of 6-methylbenzothiazole-2-one:1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.75 (brs, 1H), 7.36 (s, 1H), 7.07-7.09 (m, 1H), 7.00(d, 1H, J=8 Hz), 2.30 (s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.8, 133.9, 131.7, 127.0, 123.2, 122.5, 111.1, 20.5; MS (EI): m/z calcd for C8H7NOS [m]+: 165.0, found 165.0. m.p: 170-171° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=50:1 as developing agent, 94 mg of white solid was obtained with a yield after separation of 51.0%.
Characterization data of 5-chlorobenzothiazol-2-one: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.04 (brs, 1H), 7.61 (d, 1H, J=8.5 Hz), 7.19 (dd, 1H, J1=8.5, J2=2.5 Hz), 7.12 (d, 1H, J=2.0 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 170.0, 137.4, 130.8, 124.3, 122.4, 122.2, 111.2; MS (EI): m/z calcd for C7H4ClNOS [M]+: 184.9, found 185.0. m.p.: 224-226° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=5:1 as developing agent, 164 mg of white solid was obtained with a yield after separation of 99.3%.
Characterization data of 4-methylbenzothiazole-2-one: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.73 (brs, 1H), 7.37 (dd, 1H, J1=7.5, J2=0.5 Hz), 7.08-7.09 (m, 1H), 7.03 (t, 1H, J=7.5 Hz), 2.32 (s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 170.4, 135.0, 127.6, 122.8, 122.5, 121.3, 120.0, 17.4; MS (EI): m/z calcd for C8H7NOS [M]+: 165.1, found 165.0. m.p.: 211-212° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): ethyl acetate:petroleum ether (V/V)=3:1 as developing agent, 155 mg of white solid was obtained with a yield after separation of 67.9%.
Characterization data of methylsulfonyl benzothiazole-2-one: 1H NMR(DMSO-d6, 500 MHz): δ (ppm) 12.41 (brs, 1H), 8.22 (d, 1H, J=7.0 Hz), 7.812 (dd, 1H, J=7.5 Hz, J=2.0 Hz), 7.31 (d, 1H, J=8.0 Hz), 3.20 (s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 170.2, 140.4, 134.6, 125.6, 124.2, 122.2, 111.5, 43.9; MS (EI): m/z calcd for C8H7NO3S2 [M]+: 229.0, found 228.8. m.p.: 241-244° C.
0.5 mmol of disulfide, 0.5 mmol of base, and 2 ml of solvent were added into the reactor sequentially, and the reactor was tightened, the appropriate amount of H2S was introduced, preheated, and corresponding amount of CO2 was introduced, then reacted at the corresponding temperature for 12 hours. After the reaction was completed, the reactor was cooled to room temperature, the gas in the reactor was slowly exhausted, then extracted with ethyl acetate and saturated salt water, the organic phases were combined and separated by column chromatography to obtain the target product.
The conditions were optimized according to the above steps, and the results were shown in the following table:
1:0.4
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 148 mg of white solid was obtained with a yield after separation of 98%.
Characterization data: 1H NMR (CDCl3, 500 MHz): δ (ppm) 10.01 (brs, 1H), 7.41 (d, 1H, J=7.5 Hz), 7.30-7.26 (m, 1H), 7.17-7.14 (m, 2H). 13C NMR (CDCl3, 125 MHz): δ (ppm) 172.8, 135.3, 126.5, 123.9, 123.3, 122.6, 111.7; MS (EI): m/z calcd for C7H5NOS [M]+: 151.0, found 151.0. m.p.: 139-140° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 180 mg of white solid was obtained with a yield after separation of 97.2%.
Characterization data: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.02 (brs, 1H), 7.74 (d, 1H, J=2.0 Hz), 7.32 (dd, 1H, J1=8.5, J2=2.5 Hz), 7.11 (d, 1H, J=8.5 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 135.3, 126.4, 125.2, 122.4, 122.7; MS (EI): m/z calcd for C7H4ClNOS [m]+: 185.1, found 185.0. m.p.: 212-214° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 179 mg of white solid was obtained with a yield after separation of 78.3%.
Characterization data: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.02 (brs, 1H), 7.86 (d, 1H, J=2.0 Hz), 7.44 (dd, 1H, J1=8.5, J2=2.5 Hz), 7.05 (d, 1H, J=8.5 Hz); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 135.6, 129.2, 125.6, 125.0, 114.0, 113.1; MS (EI): m/z calcd for C7H4BrNOS [m]+: 228.9, found 228.9. m.p.: 231-232° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 169 mg of white solid was obtained with a yield after separation of 93.5%.
Characterization data: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.658 (brs, 1 H), 7.23 (d, 1H, J=2.5 Hz), 7.02 (d, 1H, J=8.5 Hz), 6.86 (dd, 1H, J1=8.5 Hz, J2=2.5 Hz), 3.73(s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.8, 155.2, 129.9, 124.3, 113.2, 112.1, 107.8, 55.6; MS (EI): m/z calcd for C8H7NO2S [M]+: 180.9, found 181.0. m.p.: 161-163° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 149 mg of white solid was obtained with a yield after separation of 90%.
Characterization data: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.73 (brs, 1H), 7.37 (dd, 1H, J1=7.5 Hz, J2=0.5 Hz), 7.08-7.09 (m, 1H), 7.03 (t, 1H, J=7.5 Hz), 2.32(s, 3H). 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 170.4, 135.0, 127.6, 122.8, 122.5, 121.3, 120.0, 17.4; MS (EI): m/z calcd for C7H5NOS [m]+: 165.1, found 165.0. m.p: 211-212° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 157 mg of white solid was obtained with a yield after separation of 95.4%.
Characterization data: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.75 (brs, 1H), 7.36 (s, 1H), 7.07-7.09 (m, 1H), 7.00(d, 1H, J=8 Hz), 2.30 (s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.8, 133.9, 131.7, 127.0, 123.2, 122.5, 111.1, 20.5; MS (EI): m/z calcd for C8H7NOS [m]+: 165.0, found 165.0. m.p.: 170-171° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 154 mg of white solid was obtained with a yield after separation of 93.5%.
Characterization data: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 11.73 (brs, 1H), 7.37 (dd, 1H, J1=7.5, J2=0.5 Hz), 7.08-7.09 (m, 1H), 7.03 (t, 1H, J=7.5 Hz), 2.32 (s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 170.4, 135.0, 127.6, 122.8, 122.5, 121.3, 120.0, 17.4; MS (EI): m/z calcd for c8h7NOS [m]+: 165.1, found 165.0. m.p: 211-212° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=1:2 as developing agent, 140 mg of white solid was obtained with a yield after separation of 61%.
Characterization data: 1H NMR(DMSO-d6, 500 MHz): δ (ppm) 12.41 (brs, 1H), 8.22 (d, 1H, J=7.0 Hz), 7.812 (dd, 1H, J=7.5 Hz, J=2.0 Hz), 7.31 (d, 1H, J=8.0 Hz), 3.20 (s, 3H); 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 170.2, 140.4, 134.6, 125.6, 124.2, 122.2, 111.5, 43.9; MS (EI): m/z calcd for C8H7NO3S2 [m]+: 229.0, found 228.8. m.p.: 241-244° C.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): dichloromethane:ethyl acetate (V/V)=20:1 as developing agent, 128 mg of white solid was obtained with a yield after separation of 76%.
Characterization data: 1H NMR (DMSO-d6, 500 MHz): δ (ppm) 12.39 (brs, 1H), 7.43 (d, 1H, J=7.5 Hz), 7.12-7.22 (m, 2H). 13C NMR (DMSO-d6, 125 MHz): δ (ppm) 169.7, 147.1(d, J=243.8 Hz), 125.5(d, J=3.8 Hz), 124.3(d, J=14.6 Hz), 123.0(d, J=6.5 Hz), 118.6(d, J=6.0 Hz), 112.7(d, J=16.9 Hz); MS (EI): M/z calcd for C7H5NOS [m]+: 169.0, found 169.0. m.p.: 172-174° C.
2 mmol of diamine, 0.8 mmol of base, and 2 mL of solvent were weighed and added to the reactor sequentially, and the reactor was tightened. The corresponding amount of H2S was introduced into the reactor, and the corresponding amount of CO2 was introduced at a suitable temperature, and then the mixture was stirred for 4 h. After the reaction was completed, the reactor was cooled to room temperature, and the reactor was opened after the gas in the reactor was slowly exhausted, then extracted, separated by column chromatography and recrystallized to obtain the target product.
The conditions were optimized according to the above steps, and the results were shown in the following table:
Extracted with ethyl acetate, separated by column chromatography and recrystallized, 170.2 mg of the pure target product was obtained with a yield of 99%.
Imidazolidin-2-one: white solid, 1H NMR (500 MHz, CDCl3) δ 3.52 (s, 1H). 13C NMR (126 MHz, CDCl3) δ 165.64, 41.04.
Extracted with ethyl acetate, separated by column chromatography and recrystallized, 153.7 mg of the pure target product was obtained with a yield of 68%. 1,3-Dimethylimidazolidin-2-one: Colorless oil, 1HNMR (500 MHz, CDCl3): d=2.79 (s,6H, 2CH3), 3.27 (s, 4H,2CH2); 13C NMR (126 MHz, CDCl3): d=31.3, 44.9, 161.9.
Extracted with ethyl acetate, and separated by column chromatography, 216.5 mg of the pure target product was obtained with a yield of 91%.
4,5-Diphenylimidazolidin-2-one: white solid, 1H NMR (500 MHz, CDCl3): δ 7.38-7.34 (m, 6H), 7.27-7.30 (m, 4H), 5.83 (s, 2H), 4.57 (s, 2H). 13C NMR (126 MHz, CDCl3) δ 163.1, 140.2, 128.7, 128.2, 126.4, 65.9;
Extracted with ethyl acetate, and separated by multiple column chromatography, 241.74 mg of the pure target product was obtained with a yield of 85%.
1,3-Diethylimidazolidin-2-one: Colorless oil, 95%. 1H NMR (500 MHz, CDCl3): δ 3.23 (s, 4H), 3.19 (q, J=7.2 Hz, 4H), 1.05 (t, J=7.2 Hz, 6H). 13C NMR (500 MHz, CDCl3): δ 161.3, 42.3, 38.9, 12.9.
Extracted with ethyl acetate, and separated by column chromatography, 278.49 mg of the pure target product was obtained with a yield of 99%.
octahydro-2H-benzo[d]imidazol-2-one: colourless solid, 1H NMR (500 MHz, CDCl3) δ 4.75 (s, 2H), 3.67 (s, 2H), 1.66 (s, 4H), 1.61-1.49 (m, 2H), 1.31 (dt, J=9.6, 5.5 Hz, 2H); 13C NMR (126 MHz, CDCl3) δ 77.67, 52.45, 28.85, 20.88.
Extracted, and separated by column chromatography, 192 mg of the pure target product was obtained with a yield of 75%.
1,3-Dimethyl-3,4,5,6-tetrahydropyrimidin-2(1H)-one: 1H NMR (500 MHz, CDCl3): d=1.97 (quintet, J=6.0 Hz, 2H, CH2), 2.92 (s, 6H, 2 CH3), 3.24 (t, J=6.0 Hz, 4H, 2 CH2); 13C NMR (126 MHz, CDCl3): d=22.1, 35.5, 47.8, 156.7.
Filtrated, 188 mg of pure target product was obtained with a yield of 73%.
5,5-dimethyltetrahydropyrimidin-2(1H)-one: white solid, 1H NMR (500 MHz, DMSO-d6) δ 6.06 (s, 2H), 2.76 (s, 4H), 0.94 (s, 6H). 13C NMR (126 MHz, DMSO-d6) δ 155.26, 51.06, 27.20, 23.89.
Extracted with ethyl acetate, and separated by column chromatography, 174.4 mg of the pure target product was obtained with a yield of 99%.
5-phenylimidazolidine-2,4-dione: white solid, 1H NMR (500 MHz, DMSO-d6) δ 10.77 (s, 1H), 8.39 (s, 1H), 7.37 (d, J=34.7 Hz, 6H), 5.16 (s, 1H). 13C NMR (126 MHz, DMSO-d6) δ 174.34, 157.65, 136.21, 128.80, 128.39, 126.86, 61.35.
Spreated by column chromatography, and recrystallized with dichloromethane and ethyl acetate, 182 mg of the target product was obtained with a yield of 91%.
4-methylimidazolidin-2-one: white solid, 1H NMR (500 MHz, CDCl3) δ 5.00 (s, 2H), 3.92 (h, J=8.3 Hz, 1H), 3.61 (t, J=8.4 Hz, 1H), 3.17-2.99 (m, 1H), 1.25 (d, J=6.4 Hz, 3H). 13C NMR (126 MHz, CDCl3) δ 163.90, 48.41 , 48.01 , 21.15.
Filtrated, 164.1 mg of pure target product was obtained with a yield of 72%.
1-methyltetrahydropyrimidin-2(1H)-one: white solid, 1H NMR (500 MHz, DMSO-d6) δ 6.11 (s, 1H), 3.15 (t, J=5.5 Hz, 2H), 3.09 (t, J=5.5 Hz, 2H), 2.74 (s, 3H), 1.79 (p, J=6.6, 5.9 Hz, 2H). 13C NMR (126 MHz, DMSO-d6) δ 46.95, 22.02
Extracted with ethyl acetate, and separated by column chromatography, 221.1 mg of the pure target product was obtained with a yield of 97%.
ethylimidazolidin-2-one: Colorless oil, 1H NMR (500 MHz, CDCl3) δ 3.50-3.35 (m, 6H), 3.25 (q, J=7.2 Hz, 2H), 1.12 (t, J=7.2 Hz, 3H). 13C NMR (126 MHz, CDCl3) δ 162.59, 44.39, 38.25, 38.09, 12.69.
Extracted with ethyl acetate, and separated by column chromatography, 172.4 mg of the pure target product was obtained with a yield of 99%.
2-Oxazolidinone: 1H NMR (500 MHz, CDCl3) δ 3.64 (t, 2H), 4.46 (t, 2H), 6.68 (s, 1H). 13CNMR (126 MHz, CDCl3), δ 41.0, 65.5, 161.5.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): methylene chloride and ethyl acetate (V/V=3:1) as developing agent, 280.6 mg of light yellow solid was obtained with a yield after separation of 86%.
4-phenyloxazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ (ppm) 7.42-7.33 (m, 5H), 5.88 (s, 1H), 4.99-4.92 (m, 1H), 4.74 (t, J=8.7 Hz, 1H), 4.19 (dd, J=8.6, 7.0 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 159.37, 141.48, 129.19, 128.44, 126.51, 71.84, 55.57. ESI-MS calcd for C9H10NO2 [M+H]+ 164.06, found 164.10.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): methylene chloride and ethyl acetate (V/V=3:1) as developing agent, 229.5 mg of pale yellow solid was obtained with a yield after separation of 70%.
5-phenyloxazolidin-2-one: white solid, 1H NMR (500 MHz, CDCl3) δ (ppm) 7.43-7.36 (m, 5H), 5.77 (brs, 1H), 5.63 (t, J=8.1 Hz, 1H), 3.99 (t, J=9.0 Hz, 1H), 3.55 (t, J=8.4 Hz, 1H). 13C NMR (126 MHz, CDCl3) δ (ppm) 159.66, 138.38, 128.92, 125.66, 77.90, 48.29. ESI-MS calcd for C9H10NO2 [M+H]+ 164.06, found 164.10.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): methylene chloride and ethyl acetate (V/V=1:1) as developing agent, 201.6 mg of product was obtained with a yield after separation of 99%.
4-methyloxazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ (ppm) 6.45 (brs, 1H), 4.50 (t, J=8.1 Hz, 1H), 4.05-3.99 (m, 1H), 3.96-3.93 (m, 1H), 1.30 (d, J=6.1 Hz, 3H). 13C NMR (126 MHz, CDCl3) δ (ppm) 160.11, 71.65, 48.25, 20.78. ESI-MS calcd for C4H8NO2 [M+H]+ 102.05, found 102.10.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): methylene chloride and ethyl acetate (V/V=1:1) as developing agent, 182.2 mg of product was obtained with a yield after separation of 90%.
5-methyloxazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ (ppm) 5.82 (brs, 1H), 4.81-4.75 (m, 1H), 3.71 (t, J=8.3 Hz, 1H), 3.21 (t, J=7.0 Hz, 1H), 1.46 (d, J=6.3 Hz, 3H). 13C NMR (126 MHz, CDCl3) δ (ppm) 160.04, 77.21, 73.50, 47.40, 20.52. ESI-MS calcd for C4H8NO2 [M+H]+ 102.05, found 102.10.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): methylene chloride and ethyl acetate (V/V=5:1) as developing agent, 225.6 mg of product was obtained with a yield after separation of 99%.
4-ethyloxazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ (ppm) 5.80 (brs, 1H), 4.04 (dd, J=8.6, 6.0 Hz, 1H), 3.84-3.79 (m, 1H), 1.57-1.66 (m, 2H), 0.95 (t, J=7.5 Hz, 3H). 13C NMR (126 MHz, CDCl3) δ (ppm) 159.73, 69.95, 53.75, 28.15, 9.29. ESI-MS calcd for C5H10NO2 [M+H]+ 116.06, found 116.10.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): methanol and methylene chloride (V/V=1:5) as developing agent, 225.9 mg of white solid was obtained with a yield after separation of 100%.
5,5-dimethyloxazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ (ppm) 5.11(brs, 1H), 3.35 (s, 2H), 1.48 (s, 6H). 13C NMR (126 MHz, CDCl3) δ (ppm) 159.34, 81.02, 52.64, 27.19. ESI-MS calcd for C5H10NO2 [M+H]+ 116.06, found 116.15.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel): methanol and methylene chloride (V/V=1:5) as developing agent, 93.5 mg of white solid was obtained with a yield after separation of 41%.
4,4-dimethyloxazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ (ppm) 6.11 (brs, 1H), 4.09 (s, 2H), 1.37 (s, 6H). 13C NMR (126 MHz, CDCl3) δ (ppm) 158.84, 76.90, 55.19, 27.59. ESI-MS calcd for C5H10NO2 [M+H]+ 116.06, found 116.10.
Separated by wet packing and dry sample loading column chromatography (200-300 mesh silica gel): methylene chloride and ethyl acetate (V/V=2:1) as developing agent, 317.3 mg of white solid was obtained with a yield after separation of 90%.
(R)-4-benzyloxazolidin-2-one: 1H NMR (500 MHz, DMSO-d6) δ (ppm) 7.78 (brs, 1H), 7.33-7.21 (m, 5H), 4.25 (t, J=8.3 Hz, 1H), 4.08-3.96 (m, 2H), 2.84-2.72 (m, 2H). 13C NMR (126 MHz, DMSO-d6) δ (ppm) 159.04, 136.99, 129.82, 128.84, 126.98, 68.46, 52.93, 40.68. ESI-MS calcd for C10H12NO2 [M+H]+ 178.08, found 178.05.
Separated by wet packing and wet sample loading column chromatography (200-300 mesh silica gel): methylene chloride and ethyl acetate (V/V=2:1) as developing agent, 237.2 mg of white solid was obtained with a yield after separation of 94%.
(S)-4-isopropyloxazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ (ppm) 6.47(brs), 4.44 (t, J=8.7 Hz, 1H), 4.10 (dd, J=8.7, 6.3 Hz, 1H), 3.63-3.59 (m, 1H), 1.77-1.70 (m, 1H), 0.97 (d, J=6.7 Hz, 3H), 0.90 (d, J=6.8 Hz, 3H). 13C NMR (126 MHz, CDCl3) δ (ppm) 160.25, 68.59, 58.34, 32.67, 17.99, 17.62. ESI-MS calcd for C6H12NO2 [M+H]+ 130.08, found 130.10.
Extracted with ethyl acetate, and separated by column chromatography, 172.0 mg of the pure target product was obtained with a yield of 86%.
1,3-Oxazinan-2-one: 1H NMR (500 MHz, DMSO d6) δ 1.77-1.85 (m, 2H, NH—CH2-CH2-CH2-O), 3.12-3.19 (m, 2H), 4.15 (t, J=5.4 Hz, 2H), 7.13 (s, 1H,). 13C NMR (126 MHz, DMSO d6) δ 21.79, 39.78, 67.04, 153.74.
Extracted with ethyl acetate, and separated by column chromatography, 171.0 mg of the pure target product was obtained with a yield of 84%.
thiazolidin-2-one: 1H NMR (500 MHz, CDCl3) δ 3.37 (t, J=3.6 Hz, 2H), 3.59 (t, J=3.6 Hz, 2H), 6.99 (s, 1H)
A magnet was placed into a 10 mL stainless steel high pressure reactor, and 1 mmol of o-aminobenzonitrile derivative, appropriate amount of H2S and 2 ml of solvent were added sequentially, and the reactor was tightened. Carbon dioxide was introduced to the reactor at the specified pressure, stirred for 24h, then the reaction was ended and cooled down. The gas in the reactor was slowly exhausted, the reactor was opened and extracted with ethyl acetate and saturated salt water. The organic phases were combined and the crude product was obtained by distillation under reduced pressure. The pure target product was obtained by column chromatography (eluted with petroleum ether and ethyl acetate).
The conditions were optimized according to the above steps, and the reaction results are shown in the following table:
1:0.5
1:1.8
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=1:1, 235.2 mg of yellow solid 6,7-dimethoxy-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 99%. The analysis results show that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=12.50 (s, 1H), 11.46 (s, 1H), 7.69 (s, 1H), 6.64 (s, 1H), 3.84 (s, 3H), 3.79 (s, 3H). 13C NMR (126 MHz, DMSO-d6) δ=188.97, 156.06, 147.50, 144.71, 134.94, 113.90, 110.09, 97.30, 56.05, 55.63. MS (ESI): m/z calcd for C10H10N2O3S [M]+: 239.04, found 239.2
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=2:1, and the polarity is increased to 1:1, 184 mg of yellow solid 6-fluoro-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 94%. The analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=12.91 (s, 1H), 11.67 (s, 1H), 7.96 (dd, J=9.7, 3.0 Hz, 1H), 7.58 (td, J=8.5, 3.0 Hz, 1H), 7.20 (dd, J=9.0, 4.6 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ=190.86 (d, J=3.3 Hz), 157.63 (d, J=240.0 Hz), 147.13, 134.92, 123.63 (d, J=24.9 Hz), 120.94 (d, J=8.19 Hz), 118.26 (d, J=8.06 Hz), 114.76 (d, J=25.3 Hz). MS (ESI): m/z calcd for C8H5FN2OS [M]+: 197.01, found 196.9
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=3:1, 217 mg of white solid 6-bromo-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 85%, and the analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=12.94 (s, 1H), 11.75 (s, 1H), 8.37 (dd, J=2.4, 1.0 Hz, 1H), 7.83 (ddd, J=8.6, 2.4, 1.0 Hz, 1H), 7.13 (dd, J=8.7, 1.1 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ=189.50, 147.08, 138.29, 137.44, 132.05, 121.64, 118.36, 114.79. MS (ESI): m/z calcd for C8H5BrN2OS [M]+: 257.9, found 257.1.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=2:1, 162 mg of yellow solid 7-fluoro-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 83%. The analysis results show that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=12.77 (s, 1H), 11.65 (s, 1H), 8.27 (t, J=7.3 Hz, 1H), 7.59 (dd, J=8.8, 6.6 Hz, 1H), 7.37-7.29 (m, 1H). 13C NMR (126 MHz, DMSO-d6) δ=190.80, 162.40, 150.31, 146.01, 141.27, 127.28, 120.12, 111.07 (d, J=11.3 Hz). MS (ESI): m/z calcd for C8H5FN2OS [M]+:, 197.01 found 197.3.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=2:1, 219mg of yellow solid 7-trifluoromethyl-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 89%, and the analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=13.05 (s, 1H), 11.81 (s, 1H), 8.47 (d, J=8.5 Hz, 1H), 7.53-7.47 (m, 1H), 7.45 (d, J=1.7 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ=191.30, 147.06, 138.48, 134.17 (q, J=32.8 Hz), 132.04, 123.34 (q, J=273.7 Hz), 122.36, 118.84 (q, J=3.8 Hz), 113.15 (q, J=3.8 Hz). MS (ESI): m/z calcd for C9H5F3N2OS [M]+: 247.01, found 247.3.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=2:1, 138 mg of yellow solid 7-chloro-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 65%, and the analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=12.71 (s, 1H), 11.56 (s, 1H), 8.23 (t, J=8.4 Hz, 1H), 7.48 (dd, J=8.5, 1.2 Hz, 1H), 6.54-6.40 (m, 1H). 13C NMR (126 MHz, DMSO-d6) δ=191.92, 170.17, 151.67, 136.49, 130.76, 115.32, 113.52, 112.55. MS (ESI): m/z calcd for C8H5ClN2OS [M]+: 212.65, found 212.3.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=2:1, 172 mg of yellow solid 7-methyl-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 89%, and the analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=12.66 (s, 1H), 11.56 (s, 1H), 8.19 (d, J=8.3 Hz, 1H), 7.03 (d, J=8.4 Hz, 1H), 6.94 (s, 1H), 2.35 (s, 3H). 13C NMR (126 MHz, DMSO-d6)) δ=188.97, 148.23, 146.65, 137.75, 131.11, 125.24, 119.85, 114.69. MS (ESI): m/z calcd for C9H8N2OS [M]+: 193.04, found 193.2.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=1:1, 80 mg of brown solid 6-nitro-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 36%, and the analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=12.51 (s, 1H), 11.28 (s, 1H), 7.48 (d, J=2.6 Hz, 1H), 7.00 (dd, J=8.7, 2.6 Hz, 1H), 6.92-6.89 (m, 1H). 13C NMR (126 MHz, DMSO-d6) δ=191.01, 158.80, 144.50, 128.55, 123.74, 122.13, 116.09, 111.20. MS (ESI): m/z calcd for C8H5N3O3S [M]+: 223.01, found 223.4.
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=2:1, 133 mg of yellow solid 5-fluoro-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 68%, and the analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=11.85 (s, 1H), 11.20 (s, 1H), 7.35 (t, J=8.1 Hz, 1H), 6.68 (d, J=8.3 Hz, 1H), 6.50 (d, J=7.8 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ=186.47, 154.09, 147.11, 141.12, 134.24, 111.58, 110.66, 104.63. MS (ESI): m/z calcd for C8H5FN2OS [M]+: 197.01, found 197.2
Separated by dry packing and dry sample loading column chromatography (200-300 mesh silica gel) with gradient elution, petroleum ether and ethyl acetate as eluent, petroleum ether:ethyl acetate (V/V)=2:1, 240 mg of yellow solid 6-trifluoromethyl-2-oxo-4-thioquinazolindione was obtained with a yield after separation of 97%, and the analysis results shown that the obtained target product has a correct structure.
1H NMR (500 MHz, DMSO-d6) δ=13.06 (s, 1H), 11.97 (d, J=3.8 Hz, 1H), 8.57-8.53 (m, 1H), 8.01-7.94 (m, 1H), 7.34 (dd, J=8.6, 3.8 Hz, 1H). 13C NMR (126 MHz, DMSO-d6) δ=191.24, 147.13, 141.10, 131.40 (q, J=3.0 Hz), 127.52 (q, J=4.4 Hz), 123.84 (q, J=272.2 Hz), 123.36 (q, J=32.8 Hz), 119.82, 117.43. MS (ESI): m/z calcd for C9H5F3N2OS [M]+: 247.01, found 247.3.
2 mmol of benzylamine, DBU and 1 mL of suitable solvent were added sequentially in a 15 mL high-pressure reactor, and the reactor was tightened; the required amount of H2S and CO2 gas was sequentially introduced into the reactor; finally, the reactor was continued to be stirred at a suitable temperature for 24 hours; after the reaction was completed, a certain amount of distilled water was added to the reaction mixture to precipitate the product completely, and then filtered and dried sequentially to obtain the product.
The conditions were optimized according to the above steps, and the reaction results were shown in the following table:
205 mg of white powder product was obtained by filtration and drying, with a yield of 91%.
1H NMR (500 MHz, DMSO-d6) δ 7.31 (t, J=7.5 Hz, 4H), 7.28-7.18 (m, 6H), 6.43 (t, J=6.1 Hz, 2H), 4.23 (d, J=6.0 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 158.08, 140.89, 128.19, 126.96, 126.52, 42.98.
MS (ESI): m/z calcd for C15H17N2O [M+H]+: 241.10, found 241.13, m.p.: 168-169° C.
244 mg of light yellow powder product was obtained by filtration and drying, with a yield of 86%.
1H NMR (500 MHz, Chloroform-d) δ 4.58 (s, 2H), 3.18-3.10 (m, 4H), 1.47 (q, J=6.8 Hz, 4H), 1.28 (d, J=10.4 Hz, 20H), 0.88 (t, J=6.4 Hz, 6H).
13C NMR (126 MHz, Chloroform-d) δ 158.50, 40.63, 31.83, 30.31, 29.36, 29.27, 26.96, 22.66, 14.09.
MS (ESI): m/z calcd for C19H40N3O [M+H+CH3CN]+: 326.30, found 326.32, m.p.: 89-91° C.
163 mg of white powder product was obtained by filtration and drying, with a yield of 71%.
1H NMR (500 MHz, DMSO-d6) δ 5.72 (t, J=5.7 Hz, 2H), 2.94 (q, J=6.8, 6.4 Hz, 4H), 1.32 (q, J=6.8 Hz, 4H), 1.27-1.18 (m, 12H), 0.85 (t, J=6.7 Hz, 6H).
13C NMR (126 MHz, Chloroform-d) δ 158.62, 40.58, 31.59, 30.29, 26.63, 22.60, 14.03.
MS (ESI): m/z calcd for C13H29N2O [M+H]+: 229.20, found 229.23, m.p.: 73-76° C.
129 mg of white powder product was obtained by filtration and drying, with a yield of 64%.
1H NMR (500 MHz, DMSO-d6) δ 5.71 (t, J=5.9 Hz, 2H), 2.95 (q, J=6.7 Hz, 4H), 1.34 (p, J=7.1 Hz, 4H), 1.31-1.18 (m, 8H), 0.86 (t, J=7.1 Hz, 6H).
13C NMR (126 MHz, DMSO-d6) δ 158.52, 40.55, 30.19, 29.06, 22.35, 14.39.
MS (ESI): m/z calcd for C11H25N2O [M+H]+: 201.15, found 201.20, m.p.: 86-88° C.
After 36 h of reaction, 157 mg of white crystalline product was obtained by filtration and drying, with a yield of 73%.
1H NMR (500 MHz, TFA-d) δ 5.11 (s, 2H), 3.54 (d, J=9.8 Hz, 4H), 3.35 (d, J=10.0 Hz, 4H), 3.22 (d, J=11.6 Hz, 2H), 2.86 (ddt, J=42.0, 22.0, 11.2 Hz, 12H).
13C NMR (126 MHz, TFA-d) δ 159.93, 55.32, 35.04, 27.30, 26.93.
MS (ESI): m/z calcd for C13H25N2O [M+H]+: 225.10, found 225.20, m.p.: 229-230° C.
243 mg of light yellow powder product was obtained by filtration and drying, with a yield of 91%.
1H NMR (500 MHz, DMSO-d6) δ 7.35-7.15 (m, 10H), 6.27 (d, J=8.1 Hz, 2H), 4.72 (q, J=7.0 Hz, 2H), 1.30 (dd, J=10.8, 7.5 Hz, 6H).
13C NMR (126 MHz, DMSO-d6) δ 156.54, 145.67, 128.27, 126.50, 125.72, 48.50, 23.40.
MS (ESI): m/z calcd for C17H21N2O [M+H]+: 269.10, found 269.17, m.p.: 122-123° C.
244 mg of silvery white powder product was obtained by filtration and drying, with a yield of 91%.
1H NMR (500 MHz, DMSO-d6) δ 7.29 (t, J=7.5 Hz, 4H), 7.23-7.16 (m, 6H), 5.89 (t, J=5.1 Hz, 2H), 3.22 (q, J=6.7 Hz, 4H), 2.67 (d, J=7.2 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 157.97, 139.81, 128.72, 128.35, 126.02, 40.97, 36.23.
MS (ESI): m/z calcd for C17H21N2O [M+H]+: 269.10, found 269.17, m.p.: 138-140° C.
285 mg of white powder product was obtained by filtration and drying, with a yield of 96%.
1H NMR (500 MHz, DMSO-d6) δ 7.26 (t, J=7.5 Hz, 2H), 7.17 (dd, J=15.1, 7.4 Hz, 3H), 5.88 (d, J=5.3 Hz, 1H), 2.98 (t, J=6.6 Hz, 2H), 2.58-2.53 (m, 2H), 1.66 (q, J=7.3 Hz, 2H).
13C NMR (126 MHz, DMSO-d6) δ 158.22, 141.91, 128.33, 128.32, 125.74, 38.84, 32.58, 31.93.
MS (ESI): m/z calcd for C19H25N2O [M+H]+: 297.20, found 297.20, m.p.: 92-93° C.
233 mg of white powder product was obtained by filtration and drying, with a yield of 86%.
1H NMR (500 MHz, DMSO-d6) δ 7.20 (d, J=4.7 Hz, 1H), 7.14 (s, 3H), 6.27 (t, J=5.5 Hz, 1H), 4.21 (d, J=4.9 Hz, 2H), 2.26 (s, 3H).
13C NMR (126 MHz, DMSO-d6) δ 157.93, 138.37, 135.45, 129.94, 127.22, 126.73, 125.77, 41.02, 18.58.
MS (ESI): m/z calcd for C17H21N2O [M+H]+: 269.10, found 269.17, m.p.: 237-238° C.
260 mg of white crystalline product was obtained by filtration and drying, with a yield of 84%.
1H NMR (500 MHz, DMSO-d6) δ 7.35 (d, J=8.3 Hz, 4H), 7.26 (d, J=8.2 Hz, 4H), 6.66 (t, J=5.8 Hz, 2H), 4.20 (d, J=5.7 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 158.20, 140.09, 131.09, 128.88, 128.19, 42.34.
MS (ESI): m/z calcd for C15H16Cl2N2NaO2 [M+Na+H2O]+: 350.05, found 350.05, m.p.: 253-254° C.
344 mg a offwhite crystalline product was obtained by filtration and drying, with a yield of 86%.
1H NMR (500 MHz, DMSO-d6) δ 7.49 (d, J=7.9 Hz, 4H), 7.19 (d, J=7.9 Hz, 4H), 6.53 (t, J=5.8 Hz, 2H), 4.18 (d, J=6.0 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 158.10, 140.50, 131.11, 129.27, 119.56, 42.42.
MS (ESI): m/z calcd for C15H16Br2N2NaO2 [M+Na+H2O]+: 439.95, found 439.95, m.p.: 268-270° C.
257 mg of white powder product was obtained by filtration and drying, with a yield of 85%
1H NMR (500 MHz, DMSO-d6) δ 7.17 (d, J=8.5 Hz, 4H), 6.86 (d, J=8.6 Hz, 4H), 6.30 (s, 2H), 4.14 (s, 4H), 3.72 (s, 6H).
13C NMR (126 MHz, DMSO-d6) δ 158.15, 132.79, 128.40, 113.70, 55.13, 42.50.
MS (ESI): m/z calcd for C17H21N2O3 [M+H]+: 301.10, found 301.16, m.p.: 178-180° C.
290 mg of light yellow solid product was obtained by filtration and drying, with a yield of 74%.
1H NMR (500 MHz, DMSO-d6) δ 7.31 (d, J=6.9 Hz, 8H), 7.28-7.18 (m, 12H), 6.95 (d, J=8.1 Hz, 2H), 5.88 (d, J=8.0 Hz, 2H).
13C NMR (126 MHz, DMSO-d6) δ 156.79, 144.01, 128.87, 127.25, 127.22, 57.41.
MS (ESI): m/z calcd for C27H25N2O [M+H]+: 393.15, found 393.20, m.p.: 283-284° C.
106 mg of off-white powder product was obtained by filtration and drying, with a yield of 39%.
1H NMR (500 MHz, DMSO-d6) δ 9.23 (s, 2H), 7.04 (d, J=8.1 Hz, 4H), 6.69 (d, J=7.2 Hz, 4H), 6.18 (d, J=6.0 Hz, 2H), 4.09 (d, J=5.8 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 157.97, 156.08, 130.92, 128.38, 114.95, 42.57.
MS (ESI): m/z calcd for C15H17N2O3 [M+H]+: 273.05, found 273.12, m.p.: 185-187° C.
240 mg of white crystalline product was obtained by filtration and drying, with a yield of 89%.
1H NMR (500 MHz, DMSO-d6) δ 7.17-7.08 (m, 8H), 6.33 (t, J=6.1 Hz, 2H), 4.17 (d, J=6.0 Hz, 4H), 2.27 (s, 6H).
13C NMR (126 MHz, DMSO-d6) δ 157.91, 137.68, 135.41, 128.62, 126.87, 42.59, 20.54.
MS (ESI): m/z calcd for C17H21N2O [M+H]+: 269.10, found 269.17, m.p.: 216-218° C.
203 mg of white solid product product was obtained by filtration and drying, with a yield of 63%.
1H NMR (500 MHz, DMSO-d6) δ 7.16 (s, 8H), 6.33 (t, J=6.0 Hz, 2H), 4.18 (d, J=5.9 Hz, 4H), 2.85 (hept, J=6.7 Hz, 2H), 1.18 (d, J=6.9 Hz, 12H).
13C NMR (126 MHz, DMSO-d6) δ 157.92, 146.59, 138.11, 126.98, 125.97, 42.67, 33.01, 23.87.
MS (ESI): m/z calcd for C21H29N2O [M+H]+: 325.15, found 325.23, m.p.: 122-123° C.
287 mg of white powder product was obtained by filtration and drying, with a yield of 78%.
1H NMR (500 MHz, DMSO-d6) δ 8.15 (d, J=8.4 Hz, 1H), 8.08 (d, J=9.5 Hz, 1H), 7.97-7.89 (m, 2H), 7.85-7.77 (m, 2H), 7.60-7.42 (m, 8H), 6.42 (dd, J=20.3, 8.1 Hz, 2H), 5.55 (h, J=6.9 Hz, 2H), 1.46 (dd, J=22.3, 6.9 Hz, 6H).
13C NMR (126 MHz, DMSO-d6) δ 156.36, 141.29, 133.41, 130.42, 128.57, 127.14, 126.04, 125.54, 123.24, 121.84, 44.65, 22.53.
MS (ESI): m/z calcd for C25H25N2O [M+H]+: 369.15, found 369.20, m.p.: 223-225° C.
33.1 mg of light yellow solid product was obtained by filtration and drying, with a yield of 87%.
1H NMR (500 MHz, DMSO-d6) δ 7.56 (d, J=8.2 Hz, 2H), 7.46 (d, J=2.0 Hz, 2H), 7.24 (dd, J=8.3, 2.0 Hz, 2H), 6.69 (t, J=6.2 Hz, 2H), 4.21 (d, J=6.1 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 157.97, 142.39, 130.80, 130.36, 128.96, 128.83, 127.29, 41.96.
MS (ESI): m/z calcd for C15H14ClN2NaO2 [M+Na+H2O]+: 419.95, found 419.97, m.p.: 174-176° C.
196 mg of white powder product was obtained by filtration and drying, with a yield of 89%.
1H NMR (500 MHz, DMSO-d6) δ 7.55 (s, 2H), 6.40-6.30 (m, 4H), 6.18 (d, J=3.2 Hz, 2H), 4.20 (d, J=5.7 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 157.40, 153.54, 141.89, 110.41, 106.22, 40.02, 39.85, 39.69, 39.52, 39.35, 39.19, 39.02, 36.37.
MS (ESI): m/z calcd for C11H13N2O3 [M+H]+: 221.00, found 221.09, m.p.: 126-128° C.
A yellow oil was obtained by separation column with a yield of 89%.
1H NMR (500 MHz, DMSO-d6) δ 6.08-6.02 (m, 2H), 3.75 (dq, J=13.9, 6.4 Hz, 4H), 3.59 (q, J=7.5 Hz, 2H), 3.10 (dq, J=14.3, 5.2 Hz, 2H), 3.05-2.95 (m, 2H), 1.89-1.72 (m, 6H), 1.52 - 1.41 (m, 2H).
13C NMR (126 MHz, DMSO-d6) δ 158.68, 78.10, 67.40, 43.56, 28.43, 25.50.
MS (ESI): m/z calcd for C11H21N2O3 [M+H]+: 229.10, found 229.16, Pyrolysis temperature: 140° C.
370 mg of yellow solid product was obtained by filtration and drying, with a yield of 93%.
1H NMR (500 MHz, TFA-d) δ 4.92 (t, J=7.1 Hz, 4H), 3.23 (p, J=6.9 Hz, 4H), 2.90 (d, J=31.6 Hz, 36H), 2.43 (td, J=6.7, 2.9 Hz, 6H).
13C NMR (126 MHz, TFA-d) δ 160.26, 109.99, 43.49, 33.13, 30.76, 30.65, 30.55, 30.51, 30.18, 29.82, 27.62, 23.70, 14.05.
MS (ESI): m/z calcd for C25H52KN2O [M+K]+: 435.30, found 435.37, m.p.: 105-106° C.
311 mg of white solid product product was obtained by filtration and drying, with a yield of 83%.
1H NMR (500 MHz, DMSO-d6) δ 7.67 (d, J=8.0 Hz, 4H), 7.46 (d, J=7.9 Hz, 4H), 6.69 (t, J=6.2 Hz, 2H), 4.32 (d, J=6.0 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 158.14, 145.99, 127.57, 127.30(q, J=32.1 Hz), 125.09(q, J=3.9 Hz), 124.44(q, J=272.4 Hz), 42.67.
MS (ESI): m/z calcd for C17H15F6N2O [M+H]+: 377.05, found 377.11, m.p.: 106-161° C.
A light yellow oil was obtained by separation column with a yield of 92%.
1H NMR (500 MHz, DMSO-d6) δ 8.50 (d, J=4.7 Hz, 2H), 7.76 (t, J=7.6 Hz, 2H), 7.30 (d, J=7.8 Hz, 2H), 7.28-7.21 (m, 2H), 6.75 (t, J=5.8 Hz, 2H), 4.34 (d, J=5.8 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 159.69, 158.12, 148.69, 136.62, 121.90, 120.84, 44.96.
197 mg of brown yellow powder product was obtained by filtration and drying, with a yield of 78%.
1H NMR (500 MHz, DMSO-d6) δ 7.36 (d, J=4.7 Hz, 2H), 6.93 (d, J=4.3 Hz, 4H), 6.50 (t, J=6.0 Hz, 2H), 4.38 (d, J=5.8 Hz, 4H).
13C NMR (126 MHz, DMSO-d6) δ 157.40, 144.22, 126.60, 124.66, 38.12.
MS (ESI): m/z calcd for C11H13N2OS2 [M+H]+: 253.00, found 253.05, m.p.: 163-165° C.
All documents referred to in the present invention are incorporated by reference herein as if each document is individually incorporated by reference. Further, it should be understood that upon reading the above teaching of the present invention, various modifications or modifications may be made to the present invention by those skilled in the art, and those equivalents also fall within the scope defined by the appended claims of the present application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202011522973.3 | Dec 2020 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/139810 | 12/20/2021 | WO |
