Tripeptide derivatives and their application in assaying enzymes

TECHNICAL FIELD
The present invention relates to tripeptide derivatives which are very easily split by certain enzymes of the enzyme class 3.4.21., more particularly factor Xa. Therefore, the new tripeptide derivatives are intended to be used as substrates for quantitatively assaying the said enzymes, more particularly factor Xa.
BACKGROUND ART
Factor Xa is a proteolytic enzyme which is formed in the blood coagulation cascade by activation of the proenzyme factor X and which, together with phospholipid and calcium ions, proteolytically splits factor II (prothrombin) at two points of the peptide chain and converts the said factor into factor IIa (thrombin) which finally causes coagulation. In certain pathological disorders, e.g. liver diseases, vitamin deficiency, etc., and in the dicoumarol therapy, the formation of factor X is reduced. In hereditary disturbances in the synthesis of factor X the formation of factor Xa, of course, also reduced correspondingly. Therefore, it is important to have at one's disposal a direct enzymatic assay method which allows factor Xa to be assayed photometrically in blood plasma in a simple and accurate manner.
The main methods for assaying factor Xa are the following:
(a) Biological assay method [cf. "Thrombosis and Bleeding Disorders," Nils U. Bang, Georg Thieme Verlag, p. 196 (1971)]: Factor X is activated to factor Xa by means of venom of Russel viper and calcium ions. In a one-step operation prothrombin is activated to thrombin by factor Xa in the presence of factor V and phospholipids, and thrombin converts indicator fibrinogen into fibrin. The clotting time is measured. The required factors II and V and fibrinogen are supplied by a substrate which is free from factor X. The clotting time is influenced by the degree of activation of factor X. The activation degree, under otherwise constant conditions, is a function of the concentration of factor X in the sample. This biological method allows no more than a rough assay to be carried out since the clotting time is read off subjectively by the experimentator. Furthermore, manipulated plasma is required during the preparation of which mistakes can occur. Moreover, the fibrinogen which is acting as an indicator is not formed directly, but via activated thrombin (indirect method).
(b) Biochemical method [cf. "Thrombosis and Bleeding Disorders," N. U. Bang, Georg Thieme Verlag, p. 196/7 (171)]: If the factor X preparations to be tested are sufficiently pure, a more accurate assay method can be applied. Esnouf and Williams (1962) have shown that factor Xa has an esterase activity and hence splits synthetic amino acid esters. However, 50 to 100 .mu.g of factor X are required for this assay. On the other hand, lower concentrations of factor Xa can be determined by using carbobenzoxy-phenylalanine p-nitrophenyl ester and measuring the quantity of p-nitrophenol released per time unit. This assaying method has the following disadvantages: The ester used undergoes an autohydrolysis at the applied pH of 8 and, moreover, is not specific for factor Xa since it responds also to many other enzymes. The ester is not soluble in water so that acetone is required. As a result of all these disadvantages this assaying method is inaccurate and costly.
(c) The published German patent application OS No. 25 52 570 discloses tetrapeptide derivatives which are intended to be used as substrates for assaying factor Xa. Bz-Ile-Glu-Gly-Arg-pNA.HCl is disclosed as an example of a tetrapeptide derivative which is split by factor Xa with formation of p-nitroaniline. The formation of p-nitroaniline can be followed spectrophotometrically. This method of assaying factor Xa is somewhat more accurate than the above-described biological and biochemical assaying methods.
However, the tetrapeptide derivatives described in German patent application DE-OS No. 25 52 570 are not sufficiently soluble in aqueous media to allow the assay of factor Xa to be carried out at substrate saturation. In the case where extremely low concentrations of factor Xa have to be determined, e.g. in pathological plasma, the said tetrapeptide derivatives are not sufficiently sensitive to allow reasonably accurate measuring values to be obtained. If the quantity of factor Xa to be measured were increased by adding a further quantity of plasma, a precipitation of the tetrapeptide substrate would take place under the influence of plasmaproteins, and as a result it would be impossible to perform the enzyme assay.
DISCLOSURE OF INVENTION
Now, new tripeptide derivatives were found which are very easily soluble in aqueous media and which have a surprisingly high sensitivity to factor Xa.
The tripeptide derivatives of the invention have the following general formula ##STR2## wherein R.sup.1 represents an alkanoyl group which has 2 to 8 carbon atoms and which may carry an amino group in the .omega.-position, a phenylalkanoyl group which has 2 to 4 carbon atoms in the alkanoyl radical and the phenyl radical of which may be substituted with an amino group in the p-position, a cyclohexylcarbonyl group which may be substituted with an aminomethyl radical in the 4-position, a benzoyl group which may be substituted with methyl, amino or halogen, e.g. Cl or Br, in the o- or p-position, an alkoxycarbonyl group having 1 to 8 carbon atoms in the alkoxy group, a benzyloxycarbonyl group which may be substituted with methoxy, methyl or chlorine in the p-position, an alkanesulfonyl group having 1 to 4 carbon atoms, a phenylsulfonyl group which may be methylated in the p-position or an .alpha.- or .beta.-naphthylsulfonyl group,
R.sup.2 represents a straight-chained or branched alkyl radical having 1 to 6, preferably 1 to 4, carbon atoms, a hydroxyalkyl radical having 1 to 2 carbon atoms, an alkoxyalkyl radical having 1 to 2 carbon atoms in the alkyl and 1 to 4 carbon atoms in the alkoxy, a benzyloxyalkyl radical having 1 to 2 carbon atoms in the alkyl, an .omega.-carboxyalkyl or .omega.-alkoxycarbonylalkyl radical which has 1 to 3 carbon atoms in the alkyl and the alkoxy group of which is straight-chained or branched and has 1 to 4 carbon atoms, an .omega.-benzyloxycarbonylalkyl radical having 1 to 3 carbon atoms in the alkyl, or a cyclohexyl-, cyclohexylmethyl-, 4-hydroxycyclohexylmethylphenyl-, benzyl-, 4-hydroxybenzyl- or imidazol-4-yl-methyl radical,
R.sup.3 represents hydrogen or a straight-chained or branched alkyl radical having 1 to 4 carbon atoms,
R.sup.4 represents hydrogen or a methyl or ethyl radical, and
R.sup.5 represents an amino group which is substituted with aromatic or heterocyclic radicals and which is capable of being split off hydrolytically with formation of a coloured or fluorescent compound H-R.sup.5.
Preferably, the strongly basic guanidine group of arginine is stabilized, e.g. by protonation with a mineral acid such as HCl, HBr, H.sub.2 SO.sub.4 or H.sub.3 PO.sub.4, or an organic acid such as formic, acetic, propionic, lactic, citric, oxalic, tartaric, benzoic, phthalic, trichloroacetic or trifluoroacetic acid. The nature of protonation has no influence whatsoever on the sensitivity (susceptibility) of the tripeptide substrate to the enzymes.
The removable chromogenic group represented by R.sup.5 in formula I can be, e.g., a p-nitrophenylamino, 1-carboxy-2-nitrophen-5-yl-amino, 1-sulfo-2-nitrophen-5-yl-amino, .beta.-naphthylamino, 4-methoxy-.beta.-naphthylamino, 5-nitro-.alpha.-naphthylamino, quinon-5-yl-amino, 8-nitro-quinon-5-yl-amino, 4-methyl-coumar-7-yl-amino or 1,3-di(methoxycarbonyl)-phen-5-yl-amino group (derived from 5-amino-isophthalic acid dimethyl ester).
The tripeptide derivatives of formula I can be prepared according to methods known per se which are described hereinafter:
(1) The chromogenic group R.sup.5 is attached to the carboxy group of the C-terminal arginine, whilst its .alpha.-amino group is protected by a protective group, e.g. a carbobenzoxy or tert.-butoxycarbonyl group, and the .delta.-guanidyl group of arginine is protected by protonation, e.g. with HCl, nitration or tosylation. The C-terminal group R.sup.5 -serves also as a protective group during the stepwise building up of the peptide chain. The remaining protective groups can be removed selectively as needed in order to attach the next amino acid derivatives until the desired peptide chain is completely built up. Finally, the remaining protective groups can be entirely removed without group R.sup.5 -being affected (cf. e.g. Miklos Bodansky et al., "Peptide Synthesis," Interscience Publishers, p. 163-165, 1966).
(2) First of all, the peptide chain is built up (according to Bodansky, loc. cit.) whilst the C-terminal carboxyl group of arginine is protected by a usual ester group, e.g. a methoxy, ethoxy or benzyloxy group. The ester groups can be removed by alkaline hydrolysis, except for the tert.-butoxy group which has to be removed selectively by means of trifluoroacetic acid. If the .delta.-guanidyl group of arginine is protonated, the said ester group is removed by trypsin, no racemization taking place in this case. Thereafter, the chromogenic group R.sup.5 -is introduced. If the .delta.-guanidino group of arginine is protected by a nitro or tosyl group and the N-terminal .alpha.-amino group of the tripeptide derivative is protected by a carbobenzoxy group or a p-methyl, p-methoxy or p-chloro-benzyloxycarbonyl group, or a tert.-butoxy group, all these protective groups are removed simultaneously. The removal can be achieved by treating the protected tripeptide derivative with anhydrous HF at room temperature, and as a result all the above-mentioned amino and .delta.-guanidino protective groups are removed. The removal can also be carried out by treatment with 2 N HBr in glacial acetic acid at room temperature if the protected tripeptide derivative does not contain any nitro or tosyl as protective groups.
The tripeptide derivatives of formula I are substantially more readily soluble in water than the tetrapeptide derivatives described in German patent application DE-OS No. 25 52 570 and thus allow the enzyme assays to be carried out at substrate saturation required for obtaining reliable measuring results. Besides, the tripeptide substrates of formula I are significantly more sensitive than the tetrapeptide derivatives disclosed in German patent application DE-OS No. 25 52 570 and can, therefore, also be used for assaying extremely low concentrations of factor Xa.
The published Dutch patent application OS No. 76 07 433 discloses tripeptide derivatives having the general formula H--D--A.sub.1 --A.sub.2 --A.sub.3 --NH--R (A.sub.1, A.sub.2, A.sub.3 =amino acid radicals) which have a high sensitivity to enzymes of enzyme class E.C. 3.4.21., e.g. thrombin and plasmin. This high sensitivity is attributed to the fact that the N-terminal D-amino acid has an unsubstituted .alpha.-amino group. Indeed, if the .alpha.-amino group of the N-terminal D-amino acid is substituted, i.e. if the hydrogen in the formula is replaced by a protective or blocking group, e.g. by benzoyl or carbobenzoxy, the sensitivity of the tripeptide derivative to enzymes of enzyme class 3.4.21. is drastically reduced. On the grounds of these findings one could have expected that the new tripeptide derivatives of formula I wherein the .alpha.-amino group of the N-terminal D-amino acid carries a protective or blocking group would not or only slightly be split by enzymes of enzyme class 3.4.21. However, contrary to all expectations, the new tripeptide substrates surprisingly have a very high sensitivity to factor Xa.
A further advantage of the tripeptide substrates of the invention as compared to the tetrapeptide derivatives disclosed in German patent application DE-OS No. 25 52 570 resides in the fact that their synthesis is simpler and less costly.
The tripeptide substrates of the invention can be used for quantitatively assaying certain enzymes of enzyme class E.C. 3.4.21. (cf. "Enzyme Nomenclature", Elsevier Scientific Publishing Company, Amsterdam, 1973, p. 238 ff.), e.g. factor Xa in blood plasma, and via factor Xa also for the quantitative assay of other biologically important factors, e.g. factor X (proenzyme of factor Xa), antifactor Xa (=antithrombin III or heparin cofactor) or heparin in blood plasma.
These various assays can be carried out in the manner described hereinafter:
(1) Assay of factor Xa and factor X:
Citrated human plasma is used and first activated with Russel viper venom (RVV=Russel viper venom) in order to convert factor X present in the plasma into factor Xa. The following reagents are used:
Buffer--TRIS-imidazole buffer, pH 8.4, ionic strength 0.3;
RVV--Freeze-dried Russel viper venom preparation (furnished by Laboratoire Stago, 92600 Asnieres s/Seine, France), dissolved in 2 ml of buffer containing CaCl.sub.2 at a concentration of 0.015 M
Substrate--Cbo-D-Leu-Sar-Arg-pNA.AcOH, dissolved in distilled H.sub.2 O, concentration: 2.times.10.sup.-3 M.
A test cuvette is charged with 0.2 ml of RVV reagent heated to 37.degree. C. and then with 0.02 ml of human citrated plasma. The two components are immediately mixed and then incubated for 60 seconds at 37.degree. C. The resulting activation mixture is diluted with 1.6 ml of buffer heated to 37.degree. C. and mixed with 0.2 ml of 2.times.10.sup.-3 M substrate solution. Then, the change in the optical density of the mixture caused by the released p-nitroaniline is measured spectrophotometrically at a wave length of 405 nm. The measured increase in the optical density per minute is directly proportional to the quantity of factor Xa present in the activated plasma. The measured increase in the optical density per minute is also a measure for the quantity of factor X present in the starting plasma since as a result of the activation a given quantity of factor X is converted stoichiometrically into the corresponding quantity of factor Xa.
(2) Assay of antifactor Xa:
A test sample is prepared by diluting citrated human plasma with TRIS-imidazole buffer at a ratio of 1:10. 100 .mu.l of a heparin solution in TRIS-imidazole buffer (containing 3 USP units of heparin per ml of buffer) are added to 100 .mu.l of the diluted plasma, and the mixture is incubated for 2 minutes at 37.degree. C. 100 .mu.l of a solution of factor Xa preparation "Diagen" (furnisher: Diagnostic Reagents, Thame, Great Britain) containing 8.5 units of factor Xa per ml are added to the incubate. The mixture is incubated for 3 minutes at 37.degree. C. The incubate is diluted with 0.6 ml of TRIS-imidazole buffer heated to 37.degree. C. and immediately mixed with 100 .mu.l of a 2.times.10.sup.-3 M solution of Cbo-D-Leu-Sar-Arg-pNA.AcOH (substrate) in distilled water heated to 37.degree. C.
In a parallel experiment a blank test sample is prepared in the same manner, but using the same volumetric quantity of buffer instead of diluted plasma.
The increase in the optical density at 405 nm is measured spectrophotometrically for both samples (test sample and blank sample). The difference between the increase in the optical density of the blank sample per minute (.DELTA.OD.sub.blank /min.) and the increase in the optical density of the test sample per min. (.DELTA.OD.sub.test /min.) is a measure for the quantity of factor Xa inhibited by the antifactor Xa-heparin complex and hence a measure for the quantity of antifactor Xa (=antithrombin III) present in the plasma.
(3) Assay of heparin in blood plasma:
A test sample is prepared by diluting plasma of a heparin-treated patient with TRIS-imidazole buffer at a ratio of 1:10. The diluted plasma is incubated for 1 to 2 minutes at 37.degree. C. 100 .mu.l of a solution of factor Xa preparation "Diagen" (furnisher: Diagnostic Reagents, Thame, Great Britain) containing 8.5 units of factor Xa per ml are added to 200 .mu.l of the incubate, and the mixture is incubated for 3 minutes at 37.degree. C. The incubate is diluted with 0.6 ml of TRIS-imidazole buffer heated to 37.degree. C. and immediatly mixed with 100 .mu.l of a 2.times.10.sup.-3 M solution of Cbo-D-Leu-Sar-Arg-pNA.AcOH (substrate) in distilled water.
In a parallel experiment a blank test sample is prepared in the same manner, but using the same quantity of correspondingly diluted normal plasma (heparin-free) instead of the diluted heparinized plasma.
The increase in the optical density per minute at 405 nm is measured spectrophotometrically for both samples. The difference between the increase in the optical density of the blank sample per minute (.DELTA.OD.sub.blank /min.) and the increase in the optical density of the test sample per minute (.DELTA.OD.sub.test /min.) is a measure for the inhibitory activity of the heparin bound to heparin-cofactor (antithrombin III).
Antifactor Xa (=heparin-cofactor or antithrombin III) alone inhibits factor Xa but slowly so that only small quantities of factor Xa are inhibited within a short incubation period (e.g. 3 minutes). However, if antifactor Xa enters into contact with heparin, the two components form a complex which is a rapid inhibitor of factor Xa and which will completely combine with factor Xa within a short incubation time (e.g. 3 minutes).
Since the inhibition of factor Xa is proportional to the quantity of heparin present, as long as sufficient antifactor Xa is present, the quantity of heparin present in the patient's plasma can be determined by means of a calibration curve established with normal plasma and increasing quantities of added heparin on the grounds of the potentiating action of the added heparin.
In the measurement of the quantity of the coloured split product H-R.sup.5 (p-nitroaniline) released in the reaction between factor Xa and the tripeptide derivatives (substrates) of the invention advantage is taken of the fact that the split product has an UV spectrum which differs from that of the substrate and is shifted towards higher wave lengths. The substrates of the invention have an absorption maximum at about 310 nm and a molar extinction coefficient of about 13,000. The absorption of the substrate at 405 nm is virtually nil. The split product H-R.sup.5, i.e. p-nitroaniline, formed by enzymatic hydrolysis of the substrate has an absorption maximum at 380 nm and a molar extinction coefficient of about 13,200. At 405 nm the extinction coefficient is only moderately reduced, i.e. to about 10,400.
In the case of substrates which contain a .beta.-naphthylamino, 4-methoxy-.beta.-naphthylamino, coumar-7-yl-amino or isophthylamino group as the chromogenic group, the quantity of split product H-R.sup.5 released by factor Xa is measured by fluorescence-spectrophotometry. In a test system comprising factor Xa, buffer and substrate the energy-poorer emitted light is continuously measured at 400 to 470 nm after the fluorescent split product has been continuously excited by energy-richer light at 300 to 400 nm. The quantity of split product formed per time unit is a measure for the existing factor Xa activity. According to definition 1 .mu.mole of split product formed per minute corresponds to 1 enzyme unit of factor Xa, as based on a given substrate.
The sensitivity of the above-described assaying methods can be further increased by converting the split product H-R.sup.5, before measurement of its quantity, into a more intensely coloured compound by coupling with a diazo compound in the case where R.sup.5 is a p-nitrophenylamino, 1-carboxy-2-nitro-phen-5-yl-amino, 1-sulfo-2-nitro-phen-5-yl-amino, 5-nitro-.alpha.-naphthylamino or 8-nitro-quinon-5-yl-amino group.
Best Mode For Carrying Out the Invention
In the following working examples the preparation of the tripeptide derivatives of the invention is described in a detailed manner. Temperatures are indicated in centigrades.
The analyses of the eluates and products obtained according to the examples were carried out by thin layer chromatography using glass plates coated with silicon dioxide gel (Merck, F 254). The thin layer chromatograms were developed by means of the following solvent system: n-butanol/acetic acid/water (3:1:1).
The following abbreviations are used:
D-Aadi=D-.alpha.-amino-adipic acid
Ac=acetyl
Ac.sub.2 O=acetic anhydride
AcOH=acetic acid
Ala=L-alanine
D-Ala=D-alanine
AOA=D-.alpha.-amino-octanoic acid
Arg=L-arginine
D-Asp=D-aspartic acid
BOC=tert.-butoxycarbonyl
Bu=butyl
But=L-2-aminobutyric acid
D-But=D-2-aminobutyric acid
Bz=benzoyl
Bzl=benzyl
Bz.sub.2 O=benzoic anhydride
ChA=quinonyl amide
D-CHA=D-3-cylohexylalanine
D-CHG=D-2-cyclohexylglycine
D-CHT=D-3-(4-hydroxycyclohexyl)-alanine=tyrosine substituted in the nucleus
Cbo=carbobenzoxy
DMF=dimethylformamide
DPA=dimethyl ester of 5-amido-isophthalic acid
TLC=thin layer chromatography or thin layer chromatogram
Et=ethyl
Et.sub.3 N=triethylamine
Gly=glycine
D-Glu=D-glutamic acid
D-His=D-histidine
HMPTA=N,N,N',N',N",N"-hexylmethyl-phosphoric acid triamide
D-Ile=D-isoleucine
D-Leu=D-leucine
SS=solvent system
MCA=7-amido-4-methylcoumarin
MeO=methoxy
MeOH=methanol
NA=naphthylamide
D-Nleu=D-norleucine
D-Nval=D-norvaline
OtBu=tert.-butoxy
OpNP=p-nitrophenoxy
pNA=p-nitroanilide
Pr=propyl
D-Ph'Gly=D-2-phenylglycine
D-Phe=D-phenylalanine
Sar=sarkosine=N-methylglycine
D-Ser=D-serine
TFA=trifluoroacetic acid
THF=tetrahydrofuran
D-Thr=D-threonine
Tos=p-toluenesulfonyl
D-Tyr=D-tyrosine
D-Val=D-valine
If not otherwise stated, the amino acids have the L-form.

EXAMPLE 1
Cbo-D-Leu-Gly-Arg-pNA.HBr
1a. Cbo-Arg-pNA.HCl
In a 250 ml three-necked flask 16.0 g (47 mM) of Cbo-Arg-OH.HCl, which had been dried in vacuo over P.sub.2 O.sub.5, were dissolved in 90 ml of abs. HMPTA at 20.degree. in the absence of humidity. To the resulting solution there was added at room temperature first a solution of 4.74 g (47.0 mM) of Et.sub.3 N in 10 ml of HMPTA and then portionwise 16.4 g (100 mM) of p-nitrophenyl isocyanate (100% excess). After a reaction time of 24 hours at 20.degree. the major portion of HMPTA was removed by distillation in vacuo. The residue was extracted several times with 30% AcOH. The residue was discarded. The combined AcOH extracts were further purified by passing them through a column of "Sephadex G-15" equilibrated with 30% AcOH and eluted with 30% AcOH. The fraction of the AcOH eluate which was split by treatment with trypsin with release of p-nitroaniline was freeze-dried. There were thus obtained 12.6 g of an amorphous powder which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.20 H.sub.25 N.sub.6 O.sub.5 Cl gave the following values: C=51.29% (51.67%), H=5.48% (5.42%), N=17.92% (18.08%), Cl=7.50% (7.63%). The values within brackets have been calculated.
1b. 2HBr.H-Art-pNA
4.65 g (10 mM) of compound 1a were treated, while stirring, with 40 ml of 2 N HBr in glacial acetic acid for 45 min. at 20.degree. in the absence of moisture. The amino acid derivative dissolved with CO.sub.2 evolution. The reaction solution was added dropwise with vigorous stirring to 250 ml of absolute ether which resulted in the precipitation of 2HBr.H-Arg-pNA. The ethereal phase was sucked off, whereupon the solid phase was washed 4 times with portions of 100 ml of abs. ether in order to substantially remove benzyl bromide which had formed as a by-product as well as excess HBr and AcOH. The residue was dissolved in 50 ml of MeOH, the pH was adjusted to 4.5 by the addition of Et.sub.3 N, and the solution was concentrated to dryness in vacuo at 30.degree.. The resulting product was dissolved in 75 ml of MeOH and passed through a column of "Sephadex" LH-20 (cross-linked dextran gel) equilibrated with MeOH. From a fraction of the eluate there were obtained 4.18 g (91.6% of the theory) of amorphous compound 1b which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.12 H.sub.20 N.sub.6 O.sub.3 Br.sub.2 gave the following values: C=31.15% (31.60%), H=4.35% (4.42%), N=18.84% (18.43%) and Br=34.81% (35.03%).
1c. Cbo-Gly-Arg-pNA.HBr
4.56 g (10 mM) of compound 1b were dissolved in 30 ml of freshly distilled DMF, and the solution was cooled to -10.degree.; 1.40 ml (10 mM) of Et.sub.3 N were added to the solution, while stirring. The formed Et.sub.3 N.HBr was removed by filtration and washed with a small quantity of cold DMF. 3.65 g (11 mM) of Cbo-Gly-OpNP were added at -10.degree. to the filtrate; while stirring, and the reaction was allowed to proceed for 2-3 hours in the absence of moisture, whereby the temperature of the reaction solution gradually mounted to about 20.degree.. The solution was again cooled to -10.degree. and buffered with 0.70 ml (5 mM) of Et.sub.3 N. The reaction solution was allowed to react for about 2 hours at -10.degree. and for three hours at room temperature. This procedure was repeated with 0.70 ml of Et.sub.3 N, and after 16 hours the reaction solution was concentrated to dryness in vacuo at 50.degree.. The residue was dissolved in 75 ml of 50% AcOH and purified by gel filtration on a column of "Sephadex" G-15 equilibrated with 50% AcOH. The fraction of the AcOH eluate which was split by treatment with trypsin with release of p-nitroaniline was concentrated to dryness in vacuo at 40.degree.. The residue was dissolved in 150 ml of MeOH and again concentrated to dryness. The resulting residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to obtain 5.85 g (88.3% of the theory) of amorphous compound 1c which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.22 H.sub.28 N.sub.7 O.sub.6 Br gave the following values: C=46.33% (46.65%), H=5.04% (4.98%), N=17.88% (17.31%) and Br=14.20% (14.11%).
1d. 2HBr.H-Gly-Arg-pNA
4.56 g (8 mM) of compound 1c were treated, while stirring, with 32 ml of 2 N HBr in glacial acetic acid for 40 min. at 20.degree.. The dipeptide derivative gradually dissolved with CO.sub.2 evolution. The reaction solution was added dropwise with vigorous stirring to 250 ml of abs. ether, and this resulted in the precipitation of 2HBr.-H-Gly-Arg-pNA. The ethereal phase was sucked off, whereupon the solid phase was washed 4 times with portions of 100 ml of abs. ether in order to substantially remove benzyl bromide which had formed as a by-product as well as excess HBr and AcOH. The residue was dissolved in 50 ml of MeOH. The pH was adjusted to 4.5 by means of Et.sub.3 N, and the solution was concentrated to dryness in vacuo at 30.degree.. The resulting residue was dissolved in 50 ml of MeOH and purified on a column of "Sephadex" LH-20 equilibrated with MeOH. The fraction of the MeOH eluate which was split by treatment with trypsin with release of p-nitroaniline was concentrated to dryness in vacuo at 30.degree.. The resulting residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to obtain 3.78 g (92.1% of the theory) of amorphous compound 1d which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.14 H.sub.23 N.sub.7 O.sub.4 Br.sub.2 gave the following values: C=32.31% (32.77%), H=4.59% (4.52%), N=19.47% (19.11%) and Br=30.78% (31.14%).
1e. Cbo-D-Leu-Gly-Arg-pNA.HBr
2.57 g (5 mM) of compound 1d were dissolved in 20 ml of freshly distilled DMF, and the solution was cooled to -10.degree.; 0.70 ml (5 mM) of Et.sub.3 N were added to the solution, while stirring. The formed Et.sub.3 N.HBr was removed by filtration and washed with a small quantity of cold DMF. 2.13 g (5.5 mM) of Cbo-D-Leu-OpNP were added at -10.degree. to the filtrate, while stirring. The reaction mixture was allowed to react for 2-3 hours in the absence of moisture, whereby the temperature of the reaction solution gradually mounted to about 20.degree.. The solution was again cooled to -10.degree. and buffered with 0.35 ml (2.5 mM) of Et.sub.3 N. The reaction solution was allowed to react for about 2 hours at -20.degree. and for a further 3 hours at room temperature. This procedure was repeated with 0.35 ml of Et.sub.3 N, and after 16 hours the reaction solution was concentrated to dryness in vacuo at 50.degree.. The residue ws dissolved in 50 ml of 50% AcOH and purified by gel filtration on a column of "Sephadex" G-15 equilibrated with 50% AcOH. The fraction of the AcOH eluate which was split by treatment with trypsin with release of p-nitroaniline was concentrated to dryness in vacuo at 40.degree.. The residue was dissolved in 100 ml of MeOH, and the solution was again concentrated to dryness. The resulting residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to obtain 3.08 g (90.6% of the theory) of amorphous compound 1e which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.28 H.sub.39 N.sub.8 O.sub.7 Br gave the following values: C=49.06% (49.49%), H=5.82% (5.78%), N=16.85% (16.49%) and Br=11.59% (11.76%).
The amino acid analysis confirmed the presence of the expected amino acids in the correct proportions: Gly:1.00--D-Leu:0.99--Arg:0.97.
EXAMPLE 2
Cbo-D-Leu-Gly-Arg-MCA.HBr
2b. 2HBr.H-Arg-MCA
13.0 g (25.9 mM) of commercial Cbo-Arg-MCA.HCl were deblocked according to Example 1b by means of 104 ml (208 mM) of a solution of 2 N HBr in glacial acetic acid. The dry residue was dissolved in 400 ml of MeOH and purified on a column of "Sephadex" LH-20. The fraction of the MeOH eluate which was split by treatment with trypsin with release of 4-methyl-7-amino-coumarin was concentrated to dryness in vacuo at 30.degree.. The resulting residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to obtain 11.2 g (87.7% of the theory) of amorphous compound 2b which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.16 H.sub.23 N.sub.5 O.sub.3 Br.sub.2 gave the following values: C=39.40% (38.96%), H=4.61% (4.70%), N=14.48% (14.20%) and Br=31.90% (32.40%).
2c. Cbo-Gly-Arg-MCA.HBr
4.93 g (10 mM) of compound 2b and 3.65 g (11 mM) of Cbo-Gly-OpNP were added to 75 ml of freshly distilled DMF. After cooling to -10.degree., there were added, while stirring, first 1.40 ml (10 mM) and then 0.70 ml (5 mM) of Et.sub.3 N. The mixture was allowed to react, in the absence of humidity, first for 3 hours at -10.degree. and then for 4 hours at room temperature. The reaction solution was again cooled to -10.degree., buffered with 0.70 ml of Et.sub.3 N and stirred overnight at 20.degree.. The reaction mixture was concentrated to dryness in vacuo at 50.degree., and the residue was dissolved in 200 ml of 50% AcOH and purified on a column of "Sephadex" G-15. The fraction of the AcOH eluate which was split by treatment with trypsin with release of 4-methyl-7-amino-coumarin was concentrated to dryness in vacuo at 40.degree.. The thus obtained residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to yield 4.98 g (82.5% of the theory) of amorphous compound 2c which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.26 H.sub.31 N.sub.6 O.sub.6 Br gave the following values: C=51.48% (51.75%), H=5.24% (5.18%), N=13.70% (13.93%) and Br=13.14% (13.24%).
2d. 2HBr.H-Gly-Arg-MCA
4.83 g (8 mM) of compound 2c were deblocked according to Example 1d by means of 32 ml of 2 N HBr in glacial acetic acid. The resulting crude product was dissolved in 100 ml of MeOH and purified on a column of "Sephadex" LH-20. The fraction of the MeOH eluate which was split by treatment with trypsin with release of 4-methyl-7-amino-coumarin was concentrated to dryness in vacuo at 30.degree.. The resulting residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to give 4.05 g (92.0% of the theory) of amorphous compound 2d which was homogeneous in the SS according to TLC. Elementary analysis and calculation from the empirical formula C.sub.18 H.sub.26 N.sub.6 O.sub.4 Br.sub.2 gave the following values: C=39.02% (39.29%), H=4.78% (4.76%), N=15.39% (15.27%) and Br=28.72% (29.04%).
2e. Cbo-D-Leu-Gly-Arg-MCA.HBr
2.75 g (5 mM) of compound 2d were reacted with 2.13 g (5.5 mM) of Cbo-D-Leu-OpNP in accordance with Example 1e. The resulting crude product was dissolved in 75 ml of 50% AcOH and purified on a column of "Sephadex" G-15. The fraction of the AcOH eluate which was split by treatment with trypsin with release of 4-methyl-7-amino-coumarin was concentrated to dryness in vacuo at 40.degree.. The residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to obtain 2.91 g (81.2% of the theory) of amorphous compound 2e which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.32 H.sub.42 N.sub.7 O.sub.7 Br gave the following values: C=53.13% (53.63%), H=6.01% (5.91%), N=13.91% (13.68%) and Br=10.88% (11.15%).
The amino acid analysis confirmed the presence of the expected amino acids in the correct proportions: Gly:1.00--Leu:1.02--Arg:0.98.
EXAMPLE 3
Cbo-D-Leu-Gly-Arg-DPA.HBr
3a. Cbo-Arg-DPA.HCl
34.48 g (0.1 mole) of dried Cbo-Arg-OH.HCl were dissolved in a 1000 ml three-necked flask in a mixture of 150 ml of freshly distilled anhydrous DMF and 300 ml of abs. THF at 20.degree.. To the solution, cooled to -10.degree., there were added, while stirring, 10.2 g (0.1 mole) of Et.sub.3 N in the absence of humidity. Then a solution of 13.65 g (0.1 mole) of isobutyl chloroformate in 50 ml of THF was added dropwise to the mixture within 20 min., whereby the reaction temperature was never allowed to exceed -5.degree.. After an additional reaction time of 10 minutes at a temperature of -10.degree. to -5.degree. a solution of 20.92 g (0.1 mole) of dimethyl 5-amino-isophthalate in 75 ml of DMF was added dropwise to the reaction mixture within 30 min., whereby the reaction temperature was always kept below -5.degree.. The reaction mixture was allowed to react for another hour at -5.degree.. Then it was stirred overnight at 20.degree. and subsequently cooled to -15.degree. in order to let the Et.sub.3 N.HCl crystallize. The formed Et.sub.3 N.HCl was filtered off and washed with a small amount of cold DMF. The filtrate and the washing solution were concentrated to dryness in vacuo at 50.degree.. The residue was dissolved in 1000 ml of 50% AcOH and purified by gel filtration on a column of "Sephadex" G-15 equilibrated with 50% AcOH. The fraction of the AcOH eluate which was split by treatment with trypsin with release of dimethyl 5-amino-isophthalate was concentrated to dryness in vacuo at 40.degree.. The residue was dried in a vacuum desiccator at 50.degree. over P.sub.2 O.sub.5 to obtain 24.6 g (45.9% of the theory) of amorphous compound 3a which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.24 H.sub.30 N.sub.5 O.sub.7 Cl gave the following values: C=53.21% (53.78%), H=5.71% (5.64%), N=13.20% (13.07%) and Cl=6.52% (6.62%).
3b. 2HBr.H-Arg-DPA
21.44 g (40 mM) of compound 3a were deblocked according to Example 1b. After the usual treatment the resulting crude product was dissolved in 250 ml of MeOH and purified by gel filtration on a column of "Sephadex" LH-20. The fraction of the MeOH eluate which was split by treatment with trypsin with release of dimethyl 5-amino-isophthalate was concentrated to dryess in vacuo. The residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to obtain 19.63 g (93.1% of the theory) of amorphous compound 3b which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.16 H.sub.25 N.sub.5 O.sub.5 Br.sub.2 gave the following values: C=36.82% (36.45%), H=4.67% (4.78%), N=13.45% (13.28%) and Br=29.85% (30.31%).
3c. Cbo-Gly-Arg-DPA.HBr
5.27 g (10 mM) of compound 3b were reacted according to Example 1c with 3.65 g (11 mM) of Cbo-Gly-OpNP. The crude product obtained after the usual treatment was dissolved in 200 ml of 50% AcOH and purified on a column of "Sephadex" G-15. The fraction of the AcOH eluate which was split by treatment with trypsin with release of dimethyl 5-amino-isophthalate was concentrated to dryness in vacuo at 40.degree.. The residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to give 5.29 g (83.0% of the theory) of amorphous compound 3c which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.26 H.sub.33 N.sub.6 O.sub.8 Br gave the following values: C=48.50% (48.99%), H=5.28% (5.22%), N=12.92% (13.18%) and Br=12.33% (12.53%).
3d. 2HBr.H-Gly-Arg-DPA
5.10 g (8 mM) of compound 3c were deblocked according to Example 1d by means of 32 ml of 2 N HBr in glacial acetic acid. The crude product obtained after the usual treatment was dissolved in 100 ml of MeOH and purified on a column of "Sephadex" LH-20. The fraction of the MeOH eluate which was split by treatment with trypsin with release of dimethyl 5-amino-isophthalate was concentrated to dryness in vacuo at 30.degree.. The residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to give 4.25 g (90.9% of the theory) of amorphous compound 3d which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.18 H.sub.28 N.sub.6 O.sub.6 Br.sub.2 gave the following values: C=36.85% (37.00%), H=4.90% (4.83%), N=14.72% (14.38%) and Br=26.95% (27.35%).
3e. Cbo-D-Leu-Gly-Arg-DPA-HBr
2.92 g (5 mM) of compound 3d were reacted according to Example 1e with 2.13 g (5.5 mM) of Cbo-D-Leu-OpNP. The crude product obtained after the usual treatment was dissolved in 100 ml of 50% AcOH and purified on a column of "Sephadex" G-15. The fraction of the AcOH eluate which was split by treatment with trypsin with relesase of dimethyl 5-amino-isophthalate was concentrated to dryness in vacuo at 40.degree.. The residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to obtain 3.11 g (82.9% of the theory) of amorphous compound 3e which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.32 H.sub.44 N.sub.7 O.sub.9 Br gave the following values: C=50.88% (51.20%), H=5.99% (5.91%), N=13.26% (13.06%) and Br=10.48% (10.64%).
The amino acid analysis confirmed the presence of the expected amino acids in the correct proportions: Gly:1.00--Leu:1.00--Arg:0.97.
EXAMPLE 4
Cbo-D-Leu-Sar-Arg-2-NA.HBr
4b. 2HBr.H-Arg-2-NA
9.40 g (20 mM) of commercial Cbo-Arg-2-NA.HCl were deblocked according to Example 1b with a solution of 80 ml of 2 N HBr in glacial acetic acid. The product obtained after the usual treatment was dissolved in 150 ml of MeOH and purified on a column of "Sephadex" LH-20. The fraction of the MeOH eluate which was split by treatment with trypsin with release of 2-naphthylamine was concentrated to dryness in vacuo at 30.degree.. The residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to obtain 8.60 g (93.2% of the theory) of amorphous compound 4b which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.16 H.sub.23 N.sub.5 OBr.sub.2 gave the following values: C=42.08% (41.67%), H=5.12% (5.03%), N=14.68% (15.19%) and Br=33.96% (34.65%).
4c. Cbo-Sar-Arg-2-NA.HBr
4.6 g (10 mM) of compound 4b were reacted according to Example 1c with 3.80 g (11 mM) of Cbo-Sar-OpNP. The crude product obtained after the usual treatment with dissolved in 150 ml of 50% AcOH and purified on a column of "Sephadex" G-15. The fraction of the AcOH eluate which was split by treatment with trypsin with release of 2-naphthylamine was concentrated to dryness in vacuo at 40.degree.. The residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to obtain 4.95 g (84.5% of the theory) of amorphous compound 4c which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.27 H.sub.33 N.sub.6 O.sub.4 Br gave the following values: C=55.72% (55.39%), H=6.73% (5.68%), N=14.68% (14.35%) and Br=13.42% (13.65%).
4d. 2HBr.H-Sar-Arg-2-NA
4.68 g (8 mM) of compound 4c were deblocked according to Example 1d by means of 28 ml of 2 N HBr in glacial acetic acid. The crude product obtained after the usual treatment was dissolved in 100 ml of MeOH and purified on a column of "Sephadex" LH-20. The fraction of the MeOH eluate which was split by treatment with trypsin with release of 2-naphthylamine was concentrated to dryness in vacuo at 30.degree.. The residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to give 4.08 g (95.8% of the theory) of amorphous compound 4d which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.19 H.sub.28 N.sub.6 O.sub.2 Br.sub.2 gave the following values: C=43.9% (42.87%), H=5.32% (5.30%), N=16.02% (15.79%) and Br=29.68% (30.02%).
4e. Cbo-D-Leu-Sar-Arg-2-NA.HBr
2.66 g (5 mM) of compound 4d were reacted according to Example 1e with 2.13 g (5.5 mM) of Cbo-D-Leu-OpNP. The crude product obtained after the usual treatment was dissolved in 100 ml of 50% AcOH and purified on a column of "Sephadex G-15". The first main fraction of the AcOH eluate which was split by treatment with trypsin with release of 2-naphthylamine was concentrated to dryness in vacuo at 40.degree. and dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5. There were thus obtained 3.01 g (86.2% of the theory) of amorphous compound 4e which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.33 H.sub.44 N.sub.7 O.sub.5 Br gave the following values: C=57.05% (56.73%), H=6.40% (6.35%), N=14.30% (14.03%) and Br=11.12% (11.44%).
The amino acid analysis confirmed the presence of the expected amino acids in the correct proportions: Sar:1.00--Leu:1.02--Arg:0.97.
EXAMPLE 5
Cbo-D-Leu-Sar-Arg-4-MeO-2-NA.HBr
5b. 2HBr.H-Arg-4-MeO-2-NA
10.0 g (20 mM) of commercial Cbo-Arg-4-MeO-2-NA.HCl were deblocked according to Example 1b by means of 80 ml of 2 N HBr in glacial acetic acid. The crude product obtained after the usual treatment was dissolved in 150 ml of MeOH and purified on a column of "Sephadex" LH-20. The main fraction of the MeOH eluate which was split by treatment with trypsin with release of 4-methoxy-2-naphthylamine was concentrated to dryness in vacuo at 30.degree.. The residue was dried in a vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 to give 8.98 g (91.4% of the theory) of amorphous compound 5b which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.17 H.sub.25 N.sub.5 O.sub.2 Br.sub.2 gave the following values: C=41.22% (41.57%), H=5.19% (5.13%), N=14.40% (14.26%) and Br=32.01% (32.53%).
5c. Cbo-Sar-Arg-4-MeO-2-NA.HBr
4.91 g (10 mM) of compound 5b were reacted according to Example 1c with 3.80 g (11 mM) of Cbo-Sar-OpNP. The crude product obtained after the usual treatment was dissolved in 150 ml of 50% AcOH and purified on a column of "Sephadex" G-15. The first main fraction of the AcOH eluate which was split by treatment with trypsin with release of 4-methoxy-2-naphthylamine was concentrated to dryness in vacuo at 40.degree.. The residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to obtain 4.86 g (79.0% of the theory) of amorphous comound 5c which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.28 H.sub.35 N.sub.6 O.sub.5 Br gave the following values: C=54.38% (54.64%), H=5.81% (5.73%), N=13.93% (13.65%) and Br=12.75% (12.98%).
5d. 2HBr.H-Sar-Arg-4-MeO-2-NA
4.31 g (7 mM) of compound 5c were deblocked according to Example 1d with 28 ml of 2 N HBr in glacial acetic acid. The crude product obtained after the usual treatment was dissolved in 100 ml of MeOH and purified on a column of "Sephadex" LH-20. The main fraction of the MeOH eluate which was split by treatment with trypsin with formation of 4-methoxy-2-naphthylamine was concentrated to dryness in vacuo at 30.degree.. The residue was dried in a vaccum desiccator at 40.degree. over P.sub.2 O.sub.5 to obtain 3.74 g (95.0% of the theory) of amorphous compound 5d which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.20 H.sub.30 N.sub.6 O.sub.3 Br.sub.2 gave the following values: C=43.01% (42.72%), H=5.44% (5.38%), N=15.25% (14.95%) and Br=28.03% (28.42%).
The amino acid analysis confirmed the presence of the expected amino acids in the correct proportions: Sar:1.00--Leu:1.01--Arg:0.98.
5e. Cbo-D-Leu-Sar-Arg-4-MeO-2-NA.HBr
2.81 g (5 mM) of compound 5d were reacted according to Example 1e with 2.13 g (5.5 mM) of Cbo-D-Leu-OpNP. The crude product obtained after the usual treatment was dissolved in 125 ml of 50% AcOH and purified on a column of "Sephadex" G-15. The first main fraction of the AcOH eluate which was split by treatment with trypsin with release of 4-methoxy-2-naphthylamine was concentrated to dryness in vacuo at 40.degree.. The residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to give 2.98 g (81.8% of the theory) of amorphous compound 5e which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.34 H.sub.46 N.sub.7 O.sub.6 Br gave the following values: C=56.28% (56.04%), H=6.34% (6.36%), N=13.75% (13.46%) and Br=10.68% (10.97%).
EXAMPLE 6
Cbo-D-Leu-Gly-Arg-pNA.AcOH
6.80 g (10 mM) of Cbo-D-Leu-Gly-Arg-pNA.HBr (prepared according to Example 1) were dissolved in 75 ml of 60% aqueous MeOH. The solution was poured on a column of "Amberlite" JRA-401 in the acetate form. The column was eluted by means of 60% aqueous MeOH, the HBr being replaced by AcOH by ion exchange. The eluate was concentrated to dryness in vacuo at 40.degree.. After drying in the vacuum desiccator at 40.degree. over P.sub.2 O.sub.5 there were obtained 6.62 g of bromide-free Cbo-D-Leu-Gly-Arg-pNA.AcOH (99.0% of the theory). Other salts with organic acids, e.g. formic acid, propionic acid, oxalic acid, tartaric acid, citric acid, lactic acid, benzoic acid, chlorobenzoic acid, salicylic acid or phthalic acid, can also be prepared from the above named tripeptide derivative according to the same method. The ion exchanger can be e.g. "Amberlite" JRA-401 in its hydrochloride form, and the desired acid salt form can be obtained by converting the said ion exchanger into the basic OH-form by treatment with caustic soda solution and then with a solution of a 1:1 mixture of the desired organic acid and its sodium salt in 60% aqueous MeOH.
EXAMPLE 7
Tos-D-Leu-Gly-Arg-pNA.HBr
6.26 g (10 mM) of 2HBr.H-D-Leu-Gly-Arg-pNA (prepared according to Example 7f, see Table 3) were dissolved in 30 ml of distilled DMF. The solution was cooled to -15.degree., and first 2.80 ml (20 mM) of Et.sub.3 N and immediately afterwards 1.91 g (10 mM) of tosyl chloride were added, while stirring, in the absence of humidity. After a reaction time of about 2 to 3 hours at -15.degree., the reaction mixture was allowed to further react overnight at room temperature. The reaction mixture was again cooled to -15.degree.. The precipitated mixture of Et.sub.3 N.HBr and Et.sub.3 N.HCl was removed by filtration and washed with a small amount of cold DMF. The filtrate and the washing solution were combined and concentrated to dryness in vacuo at 50.degree.. The residue was dissolved in 75 ml of 50% AcOH. The solution was purified on a column of "Sephadex" G-15 equilibrated with 50% AcOH. The main fraction of the AcOH eluate which was split by treatment with trypsin with release of p-nitroaniline was concentrated to dryness in vacuo at 40.degree.. The residue was dissolved in 100 ml of MeOH, and the solution was again concentrated to dryness. The residue was dried in a vacuum desiccator at 60.degree. over P.sub.2 O.sub.5 to obtain 6.65 g (95.0% of the theory) of amorphous compound Tos-D-Leu-Gly-Arg-pNA.HBr which was homogeneous in the SS as shown by TLC. Elementary analysis and calculation from the empirical formula C.sub.27 H.sub.39 N.sub.8 SO.sub.7 Br gave the following values: C=46.85% (46.35%), H=5.66% (5.62%), N=16.28% (16.02%), S=4.43% (4.58%) and Br=11.22% (11.42%).
Instead of using tosyl chloride as the acylation agent corresponding amounts of acetyl chloride, butyryl chloride, octanoyl chloride, benzoic acid chloride, p-methylbenzoic acid chloride, 2-chlorobenzoic acid chloride, methanesulfonyl chloride, n-butanesulfonyl chloride, benzenesulfonyl chloride, .alpha.-naphthalenesulfonyl chloride, methyl chloroformate, isobutyl chloroformate, octyl chloroformate, benzoic acid anhydride, acetic acid anhydride, phenylacetic acid-OpNP, phenylpropionic acid-OpNP, cyclohexylcarboxylic acid-OpNP, N-Cbo-4-aminomethylcyclohexylcarboxylic acid-OpNP, N-Cbo-.omega.-amino-n-butyric acid-OpNP, N-Cbo-.omega.aminooctanoic acid-OpNP or N-Cbo-4-aminomethylbenzoic acid-OpNP can also be used.
TABLE 1__________________________________________________________________________Ex- Starting Method Elementaryam- products yield analysis Amino acidple Final product (mMole) % found % calc.% analysis__________________________________________________________________________8 Cbo--D-Nleu--Gly--Arg--pNA.HBr 1d (5 Mole) Example 1e C 48.95 49.49 Gly:Nleu:Arg C.sub.28 H.sub.39 N.sub.8 O.sub.7 Br Cbo--D-Nleu--OpNP 82.8 H 5.83 5.78 1.00:0.99:0.97 (5.5 mMole) N 16.80 16.49 Br 11.55 11.769 Cbo--D-Nval--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 48.58 48.73 Gly:Nval:Arg C.sub.27 H.sub.37 N.sub.8 O.sub.7 Br Cbo--D-Nval--OpNP 84.2 H 5.66 5.60 1.00:1.02:0.98 (5.5 mMole) N 16.98 16.84 Br 11.86 12.0110 Cbo--D-But--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 47.73 47.93 Gly:But:Arg C.sub.26 H.sub.35 N.sub.8 O.sub.7 Br Cbo--D-But--OpNP 83.8 H 5.48 5.41 1.00:0.99:0.97 (5.5 mMole) N 17.48 17.20 Br 12.11 12.2611 Cbo--D-Ala--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 46.88 47.10 Gly:Ala:Arg C.sub.25 H.sub.33 N.sub.8 O.sub.7 Br Cbo--D-Ala--OpNP 80.5 H 5.26 5.22 1.00:1.01:0.98 (5.5 mMole) N 17.85 17.58 Br 12.33 12.5312 Cbo--D-CHA--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 50.75 51.07 Gly:CHA:Arg C.sub.30 H.sub.41 N.sub.8 O.sub.7 Br Cbo--D-CHA--OpNP 82.7 H 5.93 5.86 1.00:0.98:0.99 (5.5 mMole) N 16.10 15.88 Br 11.18 11.3213 Cbo--D-CHG--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 50.18 50.36 Gly:CHG:Arg C.sub.29 H.sub.39 N.sub.8 O.sub.7 Br Cbo--D-CHG--OpNP 83.5 H 5.69 5.68 1.00:0.97:0.99 (5.5 mMole) N 16.38 16.20 Br 11.29 11.5514 Cbo--D-CHT--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 49.62 49.93 Gly:CHT:Arg C.sub.30 H.sub.41 N.sub.8 O.sub.8 Br Cbo--D-CHT--OpNP 82.0 H 5.80 5.73 1.00:0.96:1.01 (5.5 mMole) N 15.76 15.53 Br 10.88 11.0715 Cbo--D-Ph'Gly--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 50.60 50.81 Gly:Ph'Gly:Arg C.sub.29 H.sub.33 N.sub.8 O.sub.7 Br Cbo--D-Ph'Gly-- 81.3 H 4.88 4.85 1.00:0.98:0.98 OpNP N 16.63 16.35 (5.5 mMole) Br 11.48 11.6616 Cbo--D-Phe--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 51.20 51.51 Gly:Phe:Arg C.sub.30 H.sub.35 N.sub.8 O.sub.7 Br Cbo--D-Phe--OpNP 80.0 H 5.07 5.04 1.00:1.01:0.98 (5.5 mMole) N 16.28 16.02 Br 11.35 11.4217 Cbo--D-Val--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 48.71 48.72 Gly:Val:Arg C.sub.27 H.sub.37 N.sub.8 O.sub.7 Br Cbo--D-Val--OpNP 82.8 H 5.62 5.60 1.00:1.02:1.00 (5.5 mMole) N 17.08 16.84 Br 11.90 12.0118 Cbo--D-Ile--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 49.12 49.49 Gly:Ile:Arg C.sub.28 H.sub.39 N.sub.8 O.sub.7 Br Cbo--D-Ile--OpNP 81.2 H 5.80 5.78 1.00:0.99:0.98 (5.5 mMole) N 16.66 16.49 Br 11.58 11.7619 Cbo--D-Glu(.gamma.-OtBu)--Gly--Arg-- 1d (5 mMole) Example 1e C 49.18 49.54 Gly:Glu:Arg pNA.HBr Cbo--D-Glu(.gamma.-OtBu)-- 78.2 H 5.82 5.77 1.00:0.96:0.98 C.sub.31 H.sub.43 N.sub.8 O.sub.9 Br OpNP N 15.12 14.91 (5.5 mMole) Br 10.50 10.6320 Cbo--D-Asp(.beta.-OtBu)--Gly--Arg-- 1d (5 mMole) Example 1e C 48.70 48.85 Gly:Asp:Arg pNA.HBr Cbo--D-Asp(.beta.-OtBu)-- 77.6 H 5.66 5.60 1.00:0.97:1.00 C.sub.30 H.sub.41 N.sub.8 O.sub.9 Br OpNP N 15.02 15.19 (5.5 mMole) Br 10.65 10.8321 Cbo--D-His--Gly--Arg--pNA.2HBr 1d (5 mMole) Example 1e C 42.71 42.87 Gly:His:Arg C.sub.28 H.sub.36 N.sub.10 O.sub.7 Br.sub.2 Cbo--D-His--OpNP 68.5 H 4.70 4.63 1.00:0.94:0.99 (5.5 mMole) N 18.05 17.86 Br 20.12 20.3722 Cbo--D-Leu--Sar--Arg--pNA.HBr 22d (5 mMole) Example 1e C 50.48 50.22 Sar:Leu:Arg C.sub.29 H.sub.41 N.sub.8 O.sub.7 Br Cbo--D-Leu--OpNP 82.2 H 6.02 5.96 1.00:1.01:0.97 (5,5 mMole) N 16.38 16.16 Br 11.33 11.5223 Cbo--D-Leu--Ala--Arg--pNA.HBr 23d (5 mMole) Example 1e C 50.48 50.22 Ala:Leu:Arg C.sub.29 H.sub.41 N.sub.8 O.sub.7 Br Cbo--D-Leu--OpNP 83.5 H 6.03 5.96 1.00:1.01:0.98 (5.5 mMole) N 16.28 16.16 Br 11.40 11.5224 CH.sub.3 SO.sub.2 --D-Nleu--Gly--Arg-- 36f (3 mMole) Examples C 45.66 45.84 Gly:Nleu:Arg pNA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.41 6.36 1.00:1.01:0.98 C.sub.23 H.sub.38 N.sub.8 O.sub.9 S (3.3 mMole) 83.1 N 18.93 18.59 S 5.24 5.3225 isoButoxy-CO--D-Nleu--Gly--Arg-- 36f (3 mMole) Examples C 51.63 51.91 Gly:Nleu:Arg pNA.AcOH isoButoxy- 7 & 6 H 7.12 7.10 1.00:1.02:0.99 C.sub.27 H.sub.44 N.sub.8 O.sub.9 CO--Cl 81.4 N 18.17 17.94 (3.3 mMole)26 Cbo--D-Leu--N(Et)Gly--Arg--pNA. 26d (5 mMole) Example 1e C 51.30 50.92 Leu:N(Et)Gly:Arg HBr Cbo--D-Leu--OpNP 80.6 H 6.15 6.13 1.00:0.98:0.99 C.sub.30 H.sub.43 N.sub.8 O.sub.7 Br (5.5 mMole) N 16.10 15.84 Br 11.12 11.2927 Cbo--D-Leu--N(Pr)Gly--Arg--pNA. 27d (5 mMole) Example 1e C 51.95 51.59 Leu:N(Pr)Gly:Arg HBr Cbo--D-Leu--OpNP 77.5 H 6.34 6.29 1.00:0.96:0.98 C.sub.31 H.sub.45 N.sub.8 O.sub.7 Br (5.5 mMole) N 15.80 15.53 Br 10.83 11.0728 Cbo--D-CHA--Sar--Arg--pNA.HBr 22d (5 mMole) Example 1e C 51.48 51.74 Sar:CHA:Arg C.sub.31 H.sub.43 N.sub.8 O.sub.7 Br Cbo--D-CHA--OpNP 84.2 H 6.08 6.02 1.00:0.98:0.98 (5.5 mMole) N 15.76 15.57 Br 10.95 11.1029 Cbo--D-CHT--Sar--Arg--pNA.HBr 22d (5 mMole) Example 1e C 50.33 50.61 Sar:CHT:Arg C.sub.31 H.sub.43 N.sub.8 O.sub.8 Br Cbo--D-CHT--OpNP 80.9 H 5.96 5.89 1.00:0.97:0.99 (5.5 mMole) N 15.48 15.23 Br 10.70 10.8630 Cbo--D-Nleu--Sar--Arg--pNA.HBr 22d (5 mMole) Example 1e C 50.31 50.22 Sar:Nleu:Arg C.sub.29 H.sub.41 N.sub.8 O.sub.7 Br Cbo--D-Nleu--OpNP 80.6 H 6.00 5.96 1.00:1.02:0.98 (5.5 mMole) N 16.40 16.16 Br 11.38 11.5231 Cbo--D-Nval--Sar--Arg--pNA.HBr 22d (5 mMole) Example 1e C 49.33 49.49 Sar:Nval:Arg C.sub.28 H.sub.39 N.sub.8 O.sub.7 Br Cbo--D-Nval--OpNP 82.7 H 5.80 5.78 1.00:1.00:0.98 N 16.74 16.49 Br 11.62 11.7632 Benzenesulfonyl-D-Leu--Gly-- 7f (5 mMole) Example 7g C 45.85 45.55 Gly:Leu:Arg Arg--pNA.HBr Benzenesulfo- 92 H 5.47 5.44 1.00:1.01:0.99 C.sub.26 H.sub.37 N.sub.8 O.sub.7 SBr chloride N 16.58 16.34 (5 mMole) S 4.53 4.68 Br 11.30 11.6533 Methanesulfonyl-D-Leu--Gly-- 7f (5 mMole) Example 7g C 40.90 40.45 Gly:Leu:Arg Arg--pNA.HBr Methanesulfo- 90.5 H 5.71 5.66 1.00:1.02:0.99 C.sub.21 H.sub.35 N.sub.8 O.sub.7 SBr chloride N 18.28 17.97 (5 mMole) S 5.01 5.14 Br 12.55 12.8234 .alpha.-Naphthalenesulfonyl-D-Leu-- 7f (5 mMole) Example 7g C 49.38 48.98 Gly:Leu:Arg Gly--Arg--pNA.HBr .alpha.-Naphthalene- 88 H 5.40 5.34 1.00:1.01:0.98 C.sub.30 H.sub.39 N.sub.8 O.sub.7 SBr sulfochloride N 15.55 15.23 (5 mMole) S 4.25 4.36 Br 10.62 10.8635 n-Butanesulfonyl-D-Leu--Gly-- 7f (5 mMole) Example 7g C 43.55 43.31 Gly:Leu:Arg Arg--pNA.HBr n-Butanesulfo- 88.3 H 6.28 6.21 1.00:0.99:0.99 C.sub.24 H.sub.41 N.sub.8 O.sub.7 SBr chloride N 17.08 16.84 (5 mMole) S 4.73 4.82 Br 11.84 12.0036 Ac--D-Nleu--Gly--Arg--pNA.HBr 36f (5 mMole) Example 7g C 45.18 44.98 Gly:Nleu:Arg C.sub.22 H.sub.35 N.sub.8 O.sub.6 Br Acetic acid 78.5 H 6.08 6.01 1.00:1.01:1.00 anhydride N 19.38 19.07 (6 mMole) Br 13.35 13.6037 n-Butyryl-D-Nleu--Gly--Arg-- 36f (5 mMole) Example 7g C 47.03 46.83 Gly:Nleu:Arg pNA.HBr n-Butyryl- 81.2 H 6.45 6.39 1.00:0.97:0.99 C.sub.24 H.sub.39 N.sub.8 O.sub.6 Br chloride N 18.41 18.21 (5 mMole) Br 15.38 15.6038 n-Octanoyl-D-Nleu--Gly--Arg-- 36f (5 mMole) Example 7g C 49.88 50.07 Gly:Leu:Arg pNA.HBr n-Octanoyl- 78.1 H 7.11 7.01 1.00:1.01:0.98 C.sub.28 H.sub.47 N.sub.8 O.sub.6 Br chloride N 16.79 16.68 (5 mMole) Br 11.65 11.9039 2-Phenylacetyl-D-Leu--Sar-- 39f (5 mMole) Example 7g C 51.62 51.40 Sar:Leu:Arg Arg--pNA.HBr 2--Phenylacetic 80.4 H 6.12 6.10 1.00:1.02:1.00 C.sub.29 H.sub.41 N.sub.8 O.sub.6 Br acid-OpNP N 16.80 16.54 (5.5 mMole) Br 11.53 11.7940 4-Phenylbutyryl-D-Leu--Sar-- 39f (5 mMole) Example 7g C 52.99 52.76 Sar:Leu:Arg Arg--pNA.HBr 4-Phenylbutyric 79.2 H 6.47 6.43 1.00:0.99:0.98 C.sub.31 H.sub.45 N.sub.8 O.sub.6 Br acid-OpNP N 16.05 15.88 (5.5 mMole) Br 11.18 11.3241 Cyclohexylcarbonyl-D-Leu-- 39f (5 mMole) Example 7g C 50.51 50.22 Sar:Leu:Arg Sar--Arg--pNA.HBr Cyclohexanecarb- 82.3 H 6.81 6.77 1.00:1.01:1.00 C.sub.28 H.sub.45 N.sub.8 O.sub.6 Br oxylic acid-OpNP N 16.75 16.73 (5.5 mMole) Br 11.81 11.9342 Cbo--4-aminomethyl-cyclohexyl- 39f (5 mMole) Example 7g C 53.68 53.36 Sar:Leu:Arg carbonyl-D-Leu--Sar--Arg--pNA. Cbo--4-aminome- 84.1 H 5.56 6.54 1.00:0.99:0.98 C.sub.37 H.sub.54 N.sub.9 O.sub.8 Br HBr thylhexanecarbo- N 15.30 15.14 xylic acid-OpNP Br 9.31 9.59 (5 mMole)43 4-Aminomethyl-cyclohexyl-car- 42 (3 mMole) Example 1d C 44.51 44.68 Sar:Leu:Arg bonyl-D-Leu--Sar--Arg--pNA.2HBr 2H HBr/AcOH 96.2 H 6.39 6.34 1.00:0.99:0.98 C.sub.29 H.sub.49 N.sub.9 O.sub.6 Br.sub.2 N 16.38 16.17 Br 20.18 20.5044 Cbo--Gly--D-Nleu--Sar--Arg--pNA. 44f (5 mMole) Example 1c C 49.88 49.60 Sar:Nleu:Arg HBr Cbo--Gly--OpNP 77.8 H 5.96 5.91 1.00:0.98:0.99 C.sub.31 H.sub.44 N.sub.9 O.sub.8 Br (5.5 mMole) N 16.93 16.79 Br 10.44 10.6445 H--Gly--D-Nleu--Sar--Arg--pNA. 44 (3 mMole) Example 1d C 39.88 39.61 Sar:Nleu:Arg 2HBr 2N HBr/AcOH 93.6 H 5.69 5.64 1.00:1.00:0.98 C.sub.23 H.sub.39 N.sub.9 O.sub.6 Br.sub.2 N 18.18 18.08 Br 22.52 22.9146 Cbo--.omega.-Aminobutyryl-D-Nleu-- 44f (5 mMole) Example 7g C 50.49 50.90 Sar:Nleu:Arg Sar--Arg--pNA.HBr Cbo--4-Amino- 77.2 H 6.26 6.21 1.00:0.99:0.98 C.sub.33 H.sub.48 N.sub.9 O.sub.8 Br butyryl-OpNP N 16.39 16.19 (5.5 mMole) Br 10.11 10.2647 .omega.-Aminobutyryl-D-Nleu--Sar-- 46 (3 mMole) Example 1d C 41.65 41.39 Sar:Nleu:Arg Arg--pNA.2HBr 2N HBr/AcOH 90.8 H 6.03 5.97 1.00:1.01:0.98 C.sub.25 H.sub.43 N.sub.9 O.sub.6 Br.sub.2 N 17.39 17.38 Br 21.75 22.0348 Cbo--.omega.-Aminooctanoyl-D-Nleu-- 44f (5 mMole) Example 7g C 53.09 53.23 Sar:Nleu:Arg Sar--Arg--pNA.HBr Cbo--8-Aminooc- 76.2 H 6.80 6.76 1.00:0.98:0.99 C.sub.37 H.sub.56 N.sub.9 O.sub.8 Br tanoyl-OpNP N 14.88 15.10 (5.5 mMole) Br 9.45 9.5749 .omega.-Aminooctanoyl--Sar-- 48 (3 mMole) Example 1d C 44.95 44.56 Sar:Nleu:Arg Arg--pNA.2HBr 2N HBr/AcOH 92.8 H 6.59 6.58 1.00:0.98:1.00 C.sub.29 H.sub.51 N.sub.9 O.sub.6 Br N 16.31 16.13 Br 20.12 20.4550 Bz--D-Nval--Gly--Arg--pNA.HBr 50f (5 mMole) Example 7g C 49.25 49.14 Gly:Nval:Arg C.sub.26 H.sub.35 N.sub.8 O.sub.6 Br Benzoic acid an- 77.5 H 5.59 5.55 1.00:0.99:0.98 hydride (Bz.sub.2 O) N 17.90 17.63 (7.5 mMole) Br 12.33 12.5751 4-Methylbenzoyl-D-Nval--Gly-- 50f (5 mMole) Example 7g C 50.18 49.93 Gly:Nval:Arg Arg--pNA.HBr 4-Methylbenzoic 76.8 H 5.78 5.74 1.00:1.01:0.98 C.sub.27 H.sub.37 N.sub.8 O.sub.6 Br acid anhydride N 17.35 17.25 (7.5 mMole) Br 12.18 12.3052 2-Chlorobenzoyl-D-Nval--Gly-- 50f (5 mMole) Example 7g C 50.33 49.92 Gly:Nval:Arg Arg--pNA.HCl 2-Chlorobenzoic 76.4 H 5.46 5.48 1.00:0.99:0.99 C.sub.26 H.sub.34 N.sub.8 O.sub.6 Cl.sub.2 acid anhydride N 18.09 17.91 (7.5 mMole) Cl 11.18 11.3453 2-(4-Cbo--amino)-phenylace- 50f (5 mMole) Example 7g C 52.48 52.63 Gly:Nval:Arg tyl-D-Nval--Gly--Arg--pNA.HBr 2-(4-Cbo--amino)- 77.9 H 5.52 5.55 1.00:0.98:0.98 C.sub.35 H.sub.44 N.sub.9 O.sub.8 Br Phenylacetyl-OpNP N 15.94 15.78 (5.5 mMole) Br 9.78 10.0054 2-(4-Amino)-phenylacetyl-D- 53 (3 mMole) Example 1d C 43.17 43.50 Gly:Nval:Arg Nval--Gly--Arg--pNA.2HBr 2N HBr/AcOH 91.8 H 5.24 5.27 1.00:0.99:1.00 C.sub.35 H.sub.44 N.sub.9 O.sub.8 Br.sub.2 N 17.09 16.91 Br 21.18 21.4455 CH.sub.3 O--CO--D-Nval--Sar--Arg--pNA. 55f (5 mMole) Example 7g C 43.59 43.79 Sar:Nval:Arg HBr Methyl chloro- 83.6 H 5.92 5.85 1.00:0.98:0.99 C.sub.22 H.sub.35 N.sub.8 O.sub.7 Br formate N 18.76 18.57 (5.5 mMole) Br 12.95 13.2456 CH.sub.3 --(CH.sub.2).sub.7 --O--CO--D-Nval--Sar-- 55f (5 mMole) Example 7g C 49.51 49.64 Sar:Nval:Arg Arg--pNA.HBr Octyl 79.8 H 7.08 7.04 1.00:1.00:0.98 C.sub.29 H.sub.49 N.sub.8 O.sub.7 Br chloroformate N 16.22 15.97 (5.5 mMole) Br 11.19 11.3957 BOC--D-Leu--Gly--Arg--pNA.HBr 1d (5 mMole) Example 1e C 46.88 46.51 Gly:Leu:Arg C.sub.25 H.sub.41 N.sub.8 O.sub.7 Br BOC--D-Leu--OpNP 84.2 H 6.41 6.40 1.00:1.00:0.99 (5.5 mMole) N 17.71 17.36 Br 12.20 12.3858 4-MeO--Cbo--D-Leu--Gly--Arg--pNA. 1d (5 mMole) Example 1e C 48.81 49.09 Gly:Leu:Arg HBr 4-MeO--Cbo--D- 80.5 H 5.90 5.82 1.00:1.01:0.98 C.sub.29 H.sub.41 N.sub.8 O.sub.8 Br Leu--OpNP N 16.00 15.79 (5.5 mMole) Br 11.05 11.2659 CH.sub.3 O--CO--D-CHA--Gly--Arg--pNA. 59f (5 mMole) Examples C 52.60 52.08 Gly:CHA:Arg AcOH CH.sub.3 O--CO--Cl 7 & 6 H 6.88 6.80 1.00:0.97:0.99 C.sub.27 H.sub.42 N.sub.8 O.sub.9 (5.5 mMole) 85.6 N 18.30 18.0060 C.sub.2 H.sub.5 O--CO--D-CHA--Gly--Arg-- 59f (5 mMole) Examples C 52.48 52.82 Gly:CHA:Arg pNA.AcOH C.sub.2 H.sub.5 O--CO--Cl 7 & 6 H 7.03 6.97 1.00:0.98:0.98 C.sub.28 H.sub.44 N.sub.8 O.sub.9 (5.5 mMole) 84.3 N 17.75 17.6061 CH.sub.3 SO.sub.2 --D-CHA--Gly--Arg-- 59f (5 mMole) Examples C 48.22 48.59 Gly:CHA:Arg pNA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.66 6.59 1.00:0.97:0.97 C.sub.26 H.sub.42 N.sub.8 O.sub.9 S (5.5 mMole) 86.8 N 17.58 17.44 S 4.80 4.9962 Cbo--D-Leu--Gly--Arg--2-NA. 62d (5 mMole) Example 1e C 55.78 56.14 Gly:Leu:Arg HBr Cbo--D-Leu--OpNP 79.5 H 6.24 6.18 1.00:1.01:0.99 C.sub.32 H.sub.42 N.sub.7 O.sub.5 Br (5.5 mMole) N 14.48 14.32 Br 11.45 11.6763 CH.sub.3 O--CO--D-Leu--Gly--Arg-- 62f (5 mMole) Examples C 57.02 57.23 Gly:Leu:Arg 2-NA.AcOH CH.sub.3 O--CO--Cl 7 & 6 H 7.10 7.03 1.00:1.00:0.98 C.sub.28 H.sub.41 N.sub.7 O.sub.7 (5.5 mMole) 75.9 N 16.83 16.6864 CH.sub.3 SO.sub.2 --D-Leu--Gly--Arg-- 62f (5 mMole) Examples C 53.08 53.36 Gly:Leu:Arg 2-NA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.84 6.80 1.00:1.01:0.98 C.sub.27 H.sub.41 N.sub.7 O.sub.7 S (5 mMole) 82.1 N 16.25 16.13 S 5.15 5.2865 Cbo--D-Leu--Gly--Arg--4- 65d (5 mMole) Example 1e C 55.16 55.46 Gly:Leu:Arg MeO--2-NA.HBr Cbo--D-Leu--OpNP 84.0 H 6.25 6.21 1.00:1.01:0.99 C.sub.33 H.sub.44 N.sub.7 O.sub.6 Br (5.5 mMole) N 13.96 13.72 Br 11.00 11.1866 CH.sub.3 O--CO--D-Leu--Gly--Arg-- 65f (5 mMole) Examples C 56.18 56.39 Gly:Leu:Arg 4-MeO--2-NA.AcOH CH.sub.3 O--CO--Cl 7 & 6 H 7.08 7.02 1.00:0.99:0.99 C.sub.29 H.sub.43 N.sub.7 O.sub.8 (5.5 mMole) 82.4 N 16.09 15.8767 CH.sub.3 SO.sub.2 --D-Leu--Gly--Arg-- 65f (5 mMole) Examples C 52.58 52.73 Gly:Leu:Arg 4-MeO--2-NA.AcOH CH.sub.3 SO.sub.2 Cl 7 & 6 H 6.85 6.80 1.00:1.01:0.98 C.sub.28 H.sub.43 N.sub.7 O.sub.8 S (5.5 mMole) 77.4 N 15.58 15.37 S 4.92 5.0368 CH.sub.3 O--CO--D-Leu--Gly--Arg-- 68f (5 mMole) Examples C 51.23 51.45 Gly:Leu:Arg DPA.AcOH CH.sub.3 O--CO--Cl 7 & 6 H 6.65 6.63 1.00:0.99:0.99 C.sub.28 H.sub.43 N.sub.7 O.sub.11 (5.5 mMole) 79.3 N 15.18 15.0069 CH.sub.3 SO.sub.2 --D-Leu--Gly--Arg-- 68f (5 mMole) Examples C 47.88 48.13 Gly:Leu:Arg DPA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.50 6.43 1.00:1.00:0.98 C.sub.27 H.sub.43 N.sub.7 O.sub.11 S (5.5 mMole) 81.2 N 14.75 14.55 S 4.68 4.7670 CH.sub.3 O--CO--D-Leu--Gly--Arg-- 70f (5 mMole) Examples C 54.48 54.27 Gly:Leu:Arg MCA.AcOH CH.sub.3 O--CO--Cl 7 & 6 H 6.72 6.67 1.00:1.01:1.00 C.sub.28 H.sub.41 N.sub.7 O.sub.9 (5.5 mMole) 83.2 N 16.03 15.8271 CH.sub.3 SO.sub.2 --D-Leu--Gly--Arg-- 70f (5 mMole) Examples C 50.93 50.69 Gly:Leu:Arg MCA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.51 6.46 1.00:0.99:0.98 C.sub.27 H.sub.41 N.sub.7 O.sub.9 S (5.5 mMole) 78.4 N 15.53 15.33 S 4.92 5.0172 Cbo--D-Leu--Gly--Arg--5- 72d (5 mMole) Example C 52.88 52.68 Gly:Leu:Arg NO.sub.2 --1-NA.HBr Cbo--D-Leu--OpNP 1e H 5.69 5.66 1.00:1.01:0.99 C.sub.32 H.sub.41 N.sub.8 O.sub.7 Br (5.5 mMole) 75.8 N 15.53 15.36 Br 10.82 10.9573 CH.sub.3 SO.sub.2 --D-Leu--Gly--Arg-- 72f (5 mMole) Examples C 50.08 49.68 Gly:Leu:Arg 5-NO.sub.2 --1-NA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.24 6.18 1.00:1.00:0.97 C.sub.27 H.sub.40 N.sub.8 O.sub.9 S (5.5 mMole) 80.8 N 17.29 17.17 S 4.82 4.9174 Cbo--D-Leu--Gly--Arg--5- 74d (5 mMole) Example 1e C 54.28 54.31 Gly:Leu:Arg ChA.HBr Cbo--D-Leu--OpNP 78.5 H 6.07 6.03 1.00:0.98:0.98 C.sub.31 H.sub.41 N.sub.8 O.sub.5 Br (5.5 mMole) N 16.48 16.34 Br 11.54 11.6575 CH.sub.3 SO.sub.2 --D-Leu--Gly--Arg-- 74f (5 mMole) Examples C 51.68 51.30 Gly:Leu:Arg 5-ChA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.67 6.62 1.00:0.99:0.98 C.sub.26 H.sub.40 N.sub.7 O.sub.4 S (5.5 mMole) 76.5 N 18.52 18.41 S 5.18 5.2776 Cbo--D-Leu--Gly--Arg--8- 76d (5 mMole) Example 1e C 51.11 50.96 Gly:Leu:Arg NO.sub.2 -- 5-ChA.HBr Cbo--D-Leu--OpNP 79.0 H 5.54 5.52 1.00:0.98:0.97 C.sub.31 H.sub.40 N.sub.9 O.sub.7 Br (5.5 mMole) N 17.48 17.25 Br 10.76 10.9477 CH.sub.3 SO.sub.2 --D-Leu--Gly--Arg--8- 76f (5 mMole) Examples C 48.03 47.77 Gly:Leu:Arg NO.sub.2 --5-ChA.AcOH CH.sub.3 SO.sub.2 --Cl 7 & 6 H 6.07 6.01 1.00:0.98:0.97 C.sub.26 H.sub.39 N.sub.9 O.sub.9 S (5.5 mMole) 75.7 N 19.44 19.28 S 4.83 4.9178 BOC--D-Nval--But--Arg-- 78d (5 mMole) Example 1e C 47.45 47.34 Nval:But:Arg pNA.HBr BOC--D-Nval--OpNP 74.6 H 6.61 6.57 1.00:0.98:0.98 C.sub.26 H.sub.43 N.sub.8 O.sub.7 Br (5.5 mMole) N 17.24 16.99 Br 11.88 12.1179 BOC--D-Nval--N(n-Bu)Gly-- 79d (5 mMole) Example 1e C 49.08 48.91 Nval:Arg Arg--pNA.HBr BOC--D-Nval--OpNP 66.3 H 6.95 6.89 1.00:0.98 C.sub.28 H.sub.47 N.sub.8 O.sub.7 Br (5.5 mMole) N 16.53 16.30 Br 11.41 11.6280 .beta.-Naphthyl-SO.sub.2 D-Leu-- 7f (5 mMole) Example 7 C 49.25 48.98 Gly:Leu:Arg Gly--Arg--pNA.HBr .beta.-NA--SO.sub.2 --Cl 80.2 H 5.41 5.34 1.00:0.98:0.97 C.sub.30 H.sub.39 N.sub.8 O.sub.7 SBr (5.5 mMole) N 15.43 15.23 Br 10.70 10.86 S 4.15 4.3681 4-NH.sub.2 Bz--D-Nleu--Gly-- 36f (5 mMole) Examples C 43.68 43.50 Gly:Nleu:Arg Arg--pNA.2HBr (HCl)p-NH.sub.2 -- 7 & 6 H 5.32 5.27 1.00:1.02:0.98 C.sub.27 H.sub.39 N.sub.9 O.sub.6 Br.sub.2 Bz--Cl 65.0 N 17.13 16.91 (5.5 mMole) Br 21.05 21.4482 4-Me--Cbo--D-Leu--Gly--Arg-- 1d (5 mMole) Examples C 55.68 55.35 Gly:Leu:Arg pNA.AcOH 4-Me--Cbo--D-Leu-- 1e & 6 H 6.64 6.59 1.00:1.01:0.99 C.sub.31 H.sub.44 N.sub.8 O.sub.9 OpNP 75.0 N 16.85 16.66 (5.5 mMole)83 4-Cl--Cbo--D-Leu--Gly--Arg-- 1d (5 mMole) Examples C 52.18 51.98 Gly:Leu:Arg pNA.AcOH 4-Cl--Cbo--D- 1e & 6 H 5.99 5.96 1.00:1.01:0.98 C.sub.30 H.sub.41 N.sub.8 O.sub.9 Cl Leu--OpNP 69.3 N 16.25 16.17 (5.5 mMole) Cl 5.03 5.1284 BOC-- D-(.alpha.)-AOA--Gly--Arg-- 1d (5 mMole) Examples C 53.45 53.36 Gly:Arg pNA.AcOH BOC--D-(.alpha.)-AOA-- 1e & 6 H 7.51 7.41 1.00:0.99 C.sub.29 H.sub.48 N.sub.8 O.sub.9 OpNP 65.4 N 17.38 17.17 (5.5 mMole)85 Cbo--D-Tyr(OBzl)--Gly-- 1d (5 mMole) Example C 55.26 55.68 Gly:Tyr:Arg Arg--pNA.HBr Cbo--D-Tyr(OBzl)-- 1e H 5.33 5.29 1.00:0.97:0.99 C.sub.38 H.sub.43 N.sub.8 O.sub.8 Br OpNP 75.5 N 13.85 13.67 (5.5 mMole) Br 9.58 9.7586 CH.sub.3 O--CO--D-Tyr--Gly--Arg-- 85f (5 mMole) Examples C 51.09 51.26 Gly:Tyr:Arg pNA.AcOH CH.sub.3 O--CO--Cl 7 & 6 H 5.77 5.74 1.00:0.98:1.01 C.sub.27 H.sub.36 N.sub.8 O.sub.10 (5.5 mMole) 58.4 N 17.90 17.7187 Cbo--D-Ser(OtBu)--Gly-- 1d (5 mMole) Examples C 53.78 54.06 Gly:Ser:Arg Arg--pNA.AcOH Cbo--D-Ser(OtBu) 1e & 6 H 6.48 6.44 1.00:0.96:0.99 C.sub.31 H.sub.44 N.sub.8 O.sub.10 --OpNP 73.8 N 16.45 16.27 (5.5 mMole)88 Cbo--D-Ser--Gly--Arg--pNA. 87 (5 mMole) Examples C 51.00 51.26 Gly:Ser:Arg AcOH CF.sub.3 COOH 1d & 6 H 5.79 5.74 1.00:0.97:1.00 C.sub.27 H.sub.36 N.sub.8 O.sub.10 (10 mMole) 85.3 N 18.02 17.7189 Cbo--D-Ser(OMe)--Gly--Arg-- 1d (5 mMole) Examples C 51.75 52.01 Gly:Arg pNA.AcOH Cbo--D-Ser(OMe)-- 1e & 6 H 6.00 5.92 1.00:0.98 C.sub.28 H.sub.38 N.sub.8 O.sub.10 OpNP 74.6 N 17.47 17.33 (5.5 mMole)90 Cbo--D-Ser(OBzl)--Gly-- 1d (5 mMole) Examples C 55.95 56.50 Gly:Arg Arg--pNA.AcOH Cbo--D-Ser(OBzl) 1e & 6 H 5.91 5.86 1.00:0.99 C.sub.34 H.sub.42 N.sub.8 O.sub.10 --OpNP 80.4 N 15.68 15.50 (5.5 mMole)91 Cbo--D-Thr(OtBu)--Gly-- 1d (5 mMole) Examples C 54.19 54.69 Gly:Thr:Arg Arg--pNA.AcOH Cbo--D- 1e & 6 H 6.66 6.60 1.00:0.96:0.98 C.sub.32 H.sub.46 N.sub.8 O10 Thr(OtBu)--OpNP 78.4 N 16.17 15.95 (5.5 mMole)92 Cbo--D-Thr--Gly--Arg--pNA. 91 (5 mMole) Examples C 51.88 52.01 Gly:Thr:Arg AcOH CF.sub.3 COOH 1d & 6 H 5.95 5.92 1.00:0.97:0.98 C.sub.28 H.sub.38 N.sub.8 O.sub.10 (10 mMole) 82.0 N 17.45 17.3393 Cbo--D-Thr(OMe)--Gly--Arg-- 1d (5 mMole) Examples C 52.15 52.72 Gly:Arg pNA.AcOH Cbo--D-Thr(OMe)-- 1e & 6 H 6.13 6.10 1.00:0.98 C.sub.29 H.sub.40 N.sub.8 O.sub.10 OpNP 75.5 N 17.20 16.96 (5.5 mMole)94 Cbo--D-Thr(OBzl)--Gly-- 1d (5 mMole) Examples C 56.50 57.06 Gly:Arg Arg--pNA.AcOH Cbo--D-Thr(OBzl)-- 1e & 6 H 6.07 6.02 1.00:1.00 C.sub.35 H.sub.44 N.sub.8 O.sub.10 OpNP 81.2 N 15.45 15.21 (5.5 mMole)95 Cbo--D-Asp--Gly--Arg-- 20 (5 mMole) Examples C 51.66 52.00 Gly:Asp:Arg pNA CF.sub.3 COOH 1d & 6 H 5.43 5.37 1.00:0.98:1.01 C.sub.26 H.sub.32 N.sub.8 O.sub.9 (15 mMole) 85.0 N 18.95 18.6696 Cbo--D-Glu--Gly--Arg-- 19 (5 mMole) Examples C 52.21 52.76 Gly:Glu:Arg pNA CF.sub.3 COOH 1d & 6 H 5.61 5.58 1.00:0.97:0.99 C.sub.27 H.sub.34 N.sub.8 O.sub.9 (15 mMole) 82.4 N 18.48 18.2397 Cbo--D-Glu(.gamma.-OMe)--Gly--Arg-- 1d (5 mMole) Examples C 51.84 52.32 Gly:Glu:Arg pNA.AcOH Cbo--D-Glu(.gamma.- 1e & 6 H 5.89 5.85 1.00:1.01:0.98 C.sub.30 H.sub.40 N.sub.8 O.sub. 11 OMe)--OpNP 78.6 N 16.47 16.27 (5.5 mMole)98 Cbo--D-Asp(.beta.-OMe)--Gly-- 1d (5 mMole) Examples C 51.48 51.63 Gly:Asp:Arg Arg--pNA.AcOH Cbo--D-Asp(.beta.- 1e & 6 H 5.71 5.68 1.00:1.02:1.00 C.sub.29 H.sub.38 N.sub.8 O.sub.11 OMe)--OpNP 78.9 N 16.93 16.61 (5.5 mMole)99 Cbo--D-Glu(.gamma.-OBzl)--Gly-- 1d (5 mMole) Examples C 55.38 55.99 Gly:Glu:Arg Arg--pNA.AcOH Cbo--D-Glu(.gamma.- 1e & 6 H 5.68 5.64 1.00:0.98:0.99 C.sub.35 H.sub.42 N.sub.8 O.sub.11 OBzl)--OpNP 76.7 N 15.09 14.93 (5.5 mMole)100 Cbo--D-Asp(.beta.-OBzl)--Gly-- 1d (5 mMole) Examples C 55.03 55.43 Gly:Asp:Arg Arg--pNA.AcOH Cbo--D-Asp(.beta.- 1e & 6 H 5.51 5.47 1.00:0.99:0.97 C.sub.34 H.sub.40 N.sub.8 O.sub.11 OBzl)--OpNP 74.8 N 15.48 15.21 (5.5 mMole)101 Cbo--D-Aadi(.delta.-OtBu)--Gly-- 1d (5 mMole) Examples C 54.13 54.83 Gly:Arg Arg--pNA.AcOH Cbo--D-Aadi(.delta.- 1e & 6 H 6.57 6.50 1.00:0.98 C.sub.34 H.sub.48 N.sub.8 O.sub.11 OtBu)--OpNP 71.5 N 15.29 15.05 (5.5 mMole)102 Cbo--D-Aadi--Gly--Arg-- pNA 101 (5 mMole) Examples C 52.97 53.50 Gly:Arg C.sub.28 H.sub.36 N.sub.8 O.sub.9 CF.sub.3 COOH 1d & 6 H 5.83 5.77 1.00:0.99 (15 mMole) 81.1 N 18.05 17.83103 Cbo--D-Aadi(.delta.-OBzl)--Gly-- 1d (5 mMole) Examples C 56.53 57.06 Gly:Arg Arg--pNA.AcOH Cbo--D-Aadi(.delta.- 1e & 6 H 6.00 5.95 1.00:0.99 C.sub.37 H.sub.46 N.sub.8 O.sub.11 OBzl)--OpNP 73.9 N 14.65 14.39 (5.5 mMole)__________________________________________________________________________
TABLE 2__________________________________________________________________________Dipeptide Starting product Method Elementary analysisEx. intermediate (mMole) yield % found % calc. %__________________________________________________________________________22c Cbo--Sar--Arg--pNA.HBr 1b (10 mMole) Example 1c C 47.88 47.59 C.sub.23 H.sub.30 N.sub.7 O.sub.6 Br Cbo--Sar--OpNP 84.1 H 5.25 5.21 (11 mMole) N 17.08 16.89 Br 13.50 13.7722d 2HBr.H--Sar--Arg--pNA 22c (7 mMole) Example 1d C 34.50 34.17 C.sub.15 H.sub.25 N.sub.7 O.sub.4 Br.sub.2 2N HBr/AcOH 91.2 H 4.82 4.78 N 18.91 18.60 Br 30.06 30.3123c Cbo--Ala--Arg--pNA.HBr 1b (10 mMole) Example 1c C 47.69 47.59 C.sub.23 H.sub.30 N.sub.7 O.sub.6 Br Cbo--Ala--OpNP 83.6 H 5.28 5.21 (11 mMole) N 16.95 16.89 Br 13.46 13.7723d 2HBr.H--Ala--Arg--pNA 23c (7 mMole) Example 1d C 34.28 34.17 C.sub.15 H.sub.25 N.sub.7 O.sub.4 Br.sub.2 2N HBr/AcOH 93.6 H 4.79 4.78 N 18.90 18.60 Br 29.88 30.3126c Cbo--N(Et)Gly--Arg--pNA.HBr 1b (10 mMole) Example 1c C 48.62 48.49 C.sub.24 H.sub.32 N.sub.7 O.sub.6 Br Cbo--N(Et)Gly--OpNP 86.0 H 5.48 5.43 (11 mMole) N 16.55 16.49 Br 13.25 13.4426d 2HBr.H--N(Et)Gly--Arg--pNA 26c (7 mMole) Example 1d C 35.70 35.51 C.sub.16 H.sub.27 N.sub.7 O.sub.4 Br.sub.2 2N HBr/AcOH 94.0 H 5.09 5.03 N 18.30 18.12 Br 29.22 29.5327c Cbo--N(Pr)Gly--Arg--pNA.HBr 1b (10 mMole) Example 1c C 50.08 49.35 C.sub.25 H.sub.34 N.sub.7 O.sub.6 Br (Cbo--N(Pr)Gly--OpNP 82.5 H 5.69 5.63 (11 mMole) N 16.36 16.11 Br 12.88 13.1327d 2HBr.H--N(Pr)Gly--Arg--pNA 27c (7 mMole) Example 1d C 36.68 36.77 C.sub.17 H.sub.29 N.sub.7 O.sub.4 Br.sub.2 2N HBr/AcOH 88.5 H 5.31 5.26 N 17.96 17.66 Br 28.58 28.78__________________________________________________________________________Amino acid or dipeptide Starting product Method Elementary analysisEx. intermediate (mMole) yield % found % calc. %__________________________________________________________________________62c Cbo--Gly--Arg--2-NA.HBr 4b (5 mMole) Example 4c C 54.24 54.64 C.sub.26 H.sub.31 N.sub.6 O.sub.4 Br Cbo--Gly--OpNP 75.6 H 5.52 5.47 (5.5 mMole) N 14.95 14.71 Br 13.75 13.9862d 2HBr.H--Gly--Arg--2-NA 62c (5 mMole) Example 4d C 41.50 41.72 C.sub.18 H.sub.26 N.sub.6 O.sub.2 Br.sub.2 2N HBr/AcOH 90.6 H 5.10 5.06 N 16.62 16.22 Br 30.15 30.8465c Cbo--Gly--Arg--4-MeO--2- 5b (5 mMole) Example 5c C 53.41 53.91 NA.HBr Cbo--Gly--OpNP 88.4 H 5.55 5.53 C.sub.27 H.sub.33 N.sub.6 O.sub.5 Br (5.5 mMole) N 14.22 13.97 Br 12.95 13.2865d 2HBr.H--Gly--Arg--4-MeO-- 65c (5 mMole) Example 5d C 41.32 41.62 2-NA 2N HBr/AcOH 90.9 H 5.19 5.15 C.sub.19 H.sub.28 N.sub.6 O.sub.3 Br.sub.2 N 15.54 15.33 Br 28.85 29.1572a Cbo--Arg--5-NO.sub.2 --1-NA.HCl Cbo--Arg--OH.HCl Example 3a C 55.65 55.98 C.sub.24 H.sub.27 N.sub.6 O.sub.5 Cl (25 mMole) 38.7 H 5.31 5.28 5-NO.sub.2 --1-naphthyl- N 16.54 16.32 amine Cl 6.77 6.89 (25 mMole)72b 2HBr.H.Arg--5-NO.sub.2 --1-NA 72a (5 mMole) Example 4b C 37.85 37.96 C.sub.16 H.sub.22 N.sub.6 O.sub.3 Br.sub.2 2N HBr/AcOH 88.5 H 4.41 4.38 N 16.78 16.60 Br 31.10 31.5772c Cbo--Gly--Arg--5-NO.sub.2 --1-NA.HBr 72b (3 mMole) Example 4c C 50.25 50.66 C.sub.26 H.sub.30 N.sub.7 O.sub.6 Br Cbo--Gly--OpNP 78.6 H 4.99 4.91 (3.3 mMole) N 16.10 15.91 Br 12.76 12.9672d 2HBr.H--Gly--Arg--5-NO.sub.2 --1-NA 72c (2.5 mMole) Example 1d C 38.17 38.38 C.sub.18 H.sub.25 N.sub.7 O.sub.4 Br.sub.2 2N HBr/AcOH 91 H 4.51 4.47 N 17.63 17.41 Br 28.00 28.3774a Cbo--Arg--5-ChA.HCl Cbo--Arg--OH.HCl Example 3a C 58.09 58.66 C.sub.23 H.sub.27 N.sub.6 O.sub.3 Cl (25 mMole) 31.9 H 5.84 5.78 5-aminoquinoline N 18.06 17.85 (25 mMole) Cl 7.44 7.5374b 2HBr.H--Arg--5-ChA 74a (5 mMole) Example 1d C 38.75 38.98 C.sub.15 H.sub.22 N.sub.6 OBr.sub.2 2N HBr/AcOH 81.8 H 4.83 4.80 N 18.45 18.18 Br 33.88 34.5874c Cbo--Gly--Arg--5-ChA.HBr 74b (3 mMole) Example 4c C 52.17 52.45 C.sub.25 H.sub.30 N.sub.7 O.sub.4 Br Cbo--Gly--OpNP 68.5 H 5.32 5.28 (3.3 mMole) N 17.17 17.13 Br 13.63 13.9674d 2HBr.H--Gly--Arg--5-ChA 74c (2.5 mMole) Example 1d C 39.19 39.32 C.sub.17 H.sub.25 N.sub.7 O.sub.2 Br.sub.2 2N HBr/AcOH 78.3 H 4.90 4.85 N 19.11 18.88 Br 30.45 30.7876a Cbo--Arg--8-NO.sub.2 --5-ChA.HCl Cbo--Arg--OH.HCl Example 3a C 53.14 53.54 C.sub.23 H.sub.26 N.sub.7 O.sub.5 Cl (25 mMole) 33.0 H 5.11 5.08 5-NH.sub.2 --8-NO.sub.2 -- N 19.21 19.00 quinoline Cl 6.80 6.87 (25 mMole)76b 2HBr.H--Arg--8-NO.sub.2 --5-ChA 76a (5 mMole) Example 1d C 35.42 35.52 C.sub. 15 H.sub.21 N.sub.7 O.sub.3 Br.sub.2 2N HBr/AcOH 84.2 H 4.20 4.17 N 19.50 19.33 Br 30.99 31.5176c Cbo--Gly--Arg--8-NO.sub.2 --5- 76b (3 mMole) Example 4c C 48.32 48.63 ChA.HBr Cbo--Gly--OpNP 68.5 H 4.77 4.73 C.sub.25 H.sub.29 N.sub.8 O.sub.6 Br (3.3 mMole) N 18.28 18.15 Br 12.74 12.9476d 2HBr.H--Gly--Arg--8-NO.sub.2 -- 76c (2.5 mMole) Example 1d C 36.00 36.19 5-ChA 2N HBr/AcOH 76.9 H 4.33 4.29 C.sub.17 H.sub.24 N.sub.8 O.sub.4 Br.sub.2 N 20.05 19.86 Br 27.95 28.3278c Cbo--But--Arg--pNA.HBr 1b (5 mMole) Example 1c C 48.55 48.49 C.sub.24 H.sub.32 N.sub.7 O.sub.6 Br Cbo--But--OpNP 80.4 H 5.47 5.43 (5.5 mMole) N 16.75 16.49 Br 13.20 13.4478d 2HBr.H--But--Arg--pNA 78c (3 mMole) Example 1d C 35.27 35.51 C.sub.16 H.sub.27 N.sub.7 O.sub.4 Br.sub.2 2N HBr/AcOH 84.8 H 5.03 5.03 N 18.38 18.12 Br 29.25 29.5379c Cbo--N(n-Bu)Gly--Arg--pNA.HBr 1b (5 mMole) Example 1c C 49.75 50.16 C.sub.26 H.sub.36 N.sub.7 O.sub.6 Br Cbo--N(n-Bu)Gly-- 68.2 H 5.85 5.83 OpNP N 15.90 15.75 (5.5 mMole) Br 12.63 12.8479d 2HBr.H--N(n-Bu)Gly--Arg--pNA 79c (2.5 mMole) Example 1d C 37.88 37.97 C.sub.18 H.sub.31 N.sub.7 O.sub.4 Br.sub.2 2N HBr/AcOH 80.7 H 5.54 5.49 N 17.50 17.22 Br 27.70 28.07__________________________________________________________________________
TABLE 3__________________________________________________________________________Tripeptide Starting products Method Elementary analysisEx. intermediates (mMole) yield % found % calc. %__________________________________________________________________________ 7f 2HBr.H--D-Leu--Gly--Arg--pNA 1 (5 mMole) Example 2d C 38.09 38.35 C.sub.20 H.sub.34 N.sub.8 O.sub.5 Br.sub.2 2N HBr/AcOH 96.3 H 5.41 5.47 N 17.95 17.89 Br 25.42 25.5136f 2HBr.H--D-Nleu--Gly--Arg--pNA 8 (5 mMole) Example 2d C 38.18 38.35 C.sub.20 H.sub.34 N.sub.8 O.sub.5 Br.sub.2 2N HBr/AcOH 93.4 H 5.52 5.47 N 18.06 17.89 Br 25.20 25.5139f 2HBr.H--D-Leu--Sar--Arg--pNA 22 (5 mMole) Example 2d C 39.15 39.39 C.sub.21 H.sub.36 N.sub.8 O.sub.5 Br.sub.2 2N HBr/AcOH 92.1 H 5.70 5.67 N 17.81 17.50 Br 24.81 24.9644f 2HBr.H--D-Nleu--Sar--Arg--pNA 30 (5 mMole) Example 2d C 39.08 39.39 C.sub.21 H.sub.36 N.sub.8 O.sub.5 Br.sub.2 2N HBr/AcOH 96.2 H 5.63 5.67 N 17.75 17.50 Br 24.70 24.9650f 2HBr.H--D-Nval--Gly--Arg--pNA 9 (5 mMole) Example 2d C 37.02 37.27 C.sub.19 H.sub.32 N.sub.8 O.sub.5 Br.sub.2 2N HBr/AcOH 91.8 H 5.33 5.27 N 18.55 18.30 Br 25.88 26.1055f 2HBr.H--D-Nval--Sar--Arg--pNA 31 (5 mMole) Example 2d C 38.38 38.35 C.sub.20 H.sub.34 N.sub.8 O.sub.5 Br.sub.2 2N HBr/AcOH 95.5 H 5.54 5.47 N 18.10 17.89 Br 25.25 25.5159f 2HBr.H--D-CHA--Gly--Arg--pNA 12 (5 mMole) Example 1d C 41.50 41.45 C.sub.23 H.sub.38 N.sub.8 O.sub.5 Br.sub.2 2N HBr/AcOH 82.3 H 5.77 5.75 N 17.07 16.82 Br 23.71 23.9862f 2HBr.H--D-Leu--Gly--Arg--2-NA 62 (5 mMole) Example 1d C 45.43 45.73 C.sub.24 H.sub.36 N.sub.7 O.sub.3 Br.sub.2 2N HBr/AcOH 78.5 H 5.81 5.76 N 15.81 15.55 Br 23.85 25.3565f 2HBr.H--D-Leu--Gly--Arg--4- 65 (5 mMole) Example 1d C 45.18 45.47 MeO-- 2-NA 2N HBr/AcOH 76.9 H 5.83 5.80 C.sub.25 H.sub.38 N.sub.7 O.sub.4 Br.sub.2 N 15.03 14.85 Br 23.85 24.2068f 2HBr.H--D-Leu--Gly--Arg--DPA 3e (5 mMole) Example 1d C 41.20 41.39 C.sub.24 H.sub.38 N.sub.7 O.sub.7 Br.sub.2 2N HBr/AcOH 76.9 H 5.55 5.50 N 14.23 14.08 Br 22.66 22.9570f 2HBr.H--D-Leu--Gly--Arg--MCA 2e (5 mMole) Example 1d C 43.17 43.52 C.sub.24 H.sub.36 N.sub.7 O.sub.5 Br.sub.2 2N HBr/AcOH 80.8 H 5.51 5.48 N 15.00 14.80 Br 23.81 24.1372f 2HBr.H--D-Leu--Gly--Arg--5-NO.sub.2 -- 72 (5 mMole) Example 1d C 42.51 42.68 1-NA 2N HBr/AcOH 68.4 H 5.24 5.22 C.sub.24 H.sub.35 N.sub.8 O.sub.5 Br.sub.2 N 16.83 16.59 Br 23.45 23.6674f 2HBr.H--D-Leu--Gly--Arg--5-ChA 74 (5 mMole) Example 1d C 43.68 43.75 C.sub.23 H.sub.35 N.sub.8 O.sub.3 Br.sub.2 2N HBr/AcOH 75.3 H 5.61 5.59 N 17.95 17.75 Br 25.08 25.3176f 2HBr.H--D-Leu--Gly--Arg--8- 76 (5 mMole) Example 1d C 40.75 40.84 NO.sub.2 --5-ChA 2N HBr/AcOH 72.7 H 5.10 5.07 C.sub.23 H.sub.34 N.sub.9 O.sub.5 Br.sub.2 N 18.95 18.64 Br 23.30 23.6385f 2(CF.sub.3 COOH).H--Tyr--Gly--Arg--pNA 85 (5 mMole) Examples C 43.37 43.67 C.sub.27 H.sub.32 N.sub.8 O.sub.10 F.sub.6 H.sub.2 F.sub.2 (10 ml) 1d & 6 H 4.35 4.34 63.8 N 15.24 15.09 F 14.88 15.35__________________________________________________________________________
The susceptibility of the tripeptide derivatives of the invention to factor Xa is illustrated numerically in the following Table 4 and compared with the that of the known prior art substrate Bz-Ile-Glu(.gamma.-OH)-Gly-Arg-pNA.HCl.
TABLE 4______________________________________Activity of 1 ml of aqueous solution of bovine factor Xaand a factor Xa as obtained by activation of factor X in1 ml of normal human blood plasma by means of RVV, ex-pressed in nanomoles of split product H-- R.sup.5 released perminutesubstrateconcentration bovine factor human factor2 .times. 10.sup.-4 Xa Xa______________________________________substrates accordingto examples 1 2560 1520 2 1180 760 3 1405 985 4 1290 895 5 1140 815 6 2550 1520 7 950 705 8 2780 1568 9 2010 110510 1332 82511 246 10012 1960 152813 1526 180014 1936 154815 1436 146816 1630 132017 1320 128518 1385 123519 1290 66020 1045 59521 1675 79522 1555 143223 985 58024 2214 100025 2280 82026 1205 49527 1025 43528 2028 165629 1940 184030 1986 160831 1160 101632 1070 69533 1560 98734 1040 56035 1380 89036 210 10537 280 11538 295 13539 980 62040 825 57041 600 42042 30 2043 60 3044 105 7545 250 11246 205 10847 380 20648 180 13049 410 21850 550 42051 560 42552 555 41553 680 51054 740 50555 980 120056 850 106057 2440 136058 2540 143059 2260 126060 3230 142061 2660 177062 1420 99563 1540 106564 1520 98565 1280 102566 1370 96567 1410 100568 1490 101069 1515 103070 1235 79571 1280 81072 1180 83073 1265 87574 1005 66075 1145 74576 965 71577 1080 73578 795 44079 850 36080 940 63581 495 38582 2530 138083 2480 136584 2210 169085 690 58086 890 61087 330 14688 360 16589 420 17090 510 22591 915 83092 610 41593 780 63094 1020 84595 750 46596 830 50597 1880 142098 1230 108099 1990 1515100 1280 1055101 2080 1290102 1030 905103 2260 1460Comparison substrate* 490 820______________________________________ *Bz--Ile--Glu(OH)--Gly--Arg--pNA.HCl (disclosed in German patent application No. DEOS 25 52 570)
The values of the factor Xa activity given in Table 4 were determined experimentally in the manner described hereinafter:
For determining the activity of bovine factor Xa 1.8 ml of TRIS-imidazole buffer having a pH of 8.4 and an ionic strength of 0.3 was well mixed at 37.degree. C. with 0.025 ml of an aqueous solution of factor Xa preparation "Diagen" (furnisher: Diagnostic Reagents Ltd., Thame, Great Britain) obtained by dissolving the contents of one vial in 0.5 ml of water. To the mixture there was added 0.2 ml of a 2.times.10.sup.-3 M aqueous solution of a substrate of the invention. Thereafter, the quantity of split product H-R.sup.5 in nanomoles released per minute was determined, and the corresponding value for 1 ml of factor Xa solution was calculated.
For determining the activity of human factor Xa 0.01 ml of normal citrated plasma was mixed with 0.20 ml of a solution of Russel viper venom in TRIS-imidazole buffer having a pH of 8.4 and an ionic strength of 0.3 and containing 15 mmoles of CaCl.sub.2 per ml. The mixture was incubated for 75 seconds at 37.degree. C. in order to activate factor X present in the plasma and convert it completely into factor Xa. To the incubate there was added first 1.40 ml of TRIS-imidazole buffer (pH 8.4, ionic strength 0.3) heated to 37.degree. C. and then 0.40 ml of a 2.times.10.sup.-3 M aqueous solution of a substrate of the invention. Thereafter, the quantity of split product H-R.sup.5 in nanomoles released per minute was determined, and the corresponding value for 1 ml of citrated plasma was calculated.

Number	Name	Date
3886136	Claeson et al.	May 1975
4028318	Aurell et al.	Jun 1977
4137225	Af Ekenstam et al.	Jan 1982
4162941	Aurell et al.	Jul 1979
4275153	Gargiulo et al.	Jun 1981

Tripeptide derivatives and their application in assaying enzymes

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