Chiral diphosphines and their metal complexes

Abstract

Novel chiral diphosphines (R) or (S), and their use as optically active ligand for preparing diphosphino-metallic complexes, and the diphosphino-metallic complexes containing said chiral diphosphines (R) or (S), and the use of the diphosphino-metallic complexes as catalyst in asymmetric catalysis of unsaturated compounds bearing functional groups.

Description

FIELD OF THE INVENTION

[0002] This invention relates to dissymmetric atropisomer diphosphines, their synthesis and their use as optically active ligands for the preparation of diphosphino-metal complexes. The invention also pertains to diphosphino-metal complexes comprising a dissymmetric chiral diphosphine ligand and the asymmetric catalysis processes employing these complexes. The invention envisages more particularly the use of these diphosphino-metal complexes in asymmetric hydrogenation or hydrogen-transfer procedures for the synthesis of organic products of specified chirality.

BACKGROUND

[0003] FUPMOP is known in the prior art. It is a dissymmetric atropisomer used for the synthesis of diphosphino-metal complexes having enantioselective catalytic properties in hydrogenation (M. Murata et al., Synlett, 1991, page 827).

SUMMARY OF THE INVENTION

[0004] This invention relates to novel chiral diphosphines (R) or (S), and their use as optically active ligand for preparing diphosphino-metallic complexes.

[0005] This invention also relates to the diphosphino-metallic complexes containing said chiral diphosphines (R) or (S), and the use of the diphosphino-metallic complexes as catalyst in asymmetric catalysis of unsaturated compounds bearing functional groups.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG. 1 is a reaction diagram showing the progression from formula (XIII) to formula (XII) to formula (I).

[0007] FIG. 2 is a reaction diagram showing the transformation from formula (XV) to formula (XIV) to formula (XIII).

[0008] FIG. 3 is a reaction diagram of the transformation from formula (XVIII A) to formula (XVI) and the reaction of formulae (XVII) and (XVI) to formula (XV).

[0009] FIG. 4 is a reaction diagram showing the transformation of formula (XIX A) to formula (XVIII A) to formula (XVI) and the transformation of formula (XIX B) to formula (XVM B) to formula (XVII).

[0010] FIG. 5 is a table of selected compounds taken from the Examples and selected reaction conditions.

DETAILED DESCRIPTION

[0011] We have now developed new diphosphino-metal complexes comprising a dissymmetric atropisomer diphosphine as optically active ligand which are particularly useful for the synthesis of organic products of specified chirality with very high yields and enantioselectivity.

[0012] Please replace the paragraph spanning pages 1 and 2 with the following:

[0013] Thus, the invention [has as its object the use of] includes an (R) or (S) chiral diphosphine of formula (1): 1

[0014] wherein R1, R2, R3, R4, R5 and R6, which can be [identical] the same or different, are selected from among a hydrogen atom, a halogen such as chlorine, bromine or fluorine, an optionally saturated C1-4 alkyl group, an optionally saturated C1-4 alkoxy group, a C4-6 aryloxy group, [said] the alkyl, alkoxy or aryloxy groups being optionally substituted by a halogen, a hydroxy, a C1-5 alkyl or a benzyl,

[0015] or R2 and R3 or R4 and R5 together form an optionally substituted benzene ring, a methylene dioxy group, ethylene dioxy group, optionally saturated C3-7 cycloalkyl group, such as an optionally substituted cyclohexyl, or a heterocycle of formula (II): 2

[0016] [in which] wherein W and Q, which can be [identical] the same or different, are selected from among an oxygen atom, a sulfoxide (—SO) or a sulfone (—SO2) functional group or a methylene group and n is equal to 0 or 1,

[0017] or R3 and R4 form a ring such as a C2-4 alkylene dioxy such as a methylene dioxy, an ethylene dioxy, an optionally saturated C3-7 cycloalkyl, such as an optionally substituted cycloalkyl, a heterocycle of formula (II) optionally substituted by a halogen, a hydroxy, a C1-5 alkyl or a C1-5 alkoxy;

[0018] R7 and R8, which can be [identical] the same or different, represent an aryl optionally substituted by an alkyl, a halogen or an alkoxy such as, for example, a phenyl, a tolyl, a trimethyl phenyl or a tertiobutyl phenyl, or represents a C5-6 cycloalkyl such as, for example, a cyclopentyl, a cyclohexyl optionally substituted by an alkyl, a halogen or an alkoxy.

[0019] On page 2, please replace the second full paragraph with the following:

[0020] The (R) or (S) chiral diphosphines of formula (1) of the [present] invention are prepared by a procedure of the type described by D. CAI et al. (J. Org. Chem. 1994, p. 7180) from compounds of formula (XIII), then formula (XII) according to the reaction diagram [represented] in [figure] FIG. 1 [of the attached drawings].

[0021] On page 3, please replace the first two full paragraphs with the following:

[0022] These compounds, most particularly the compounds of formula (XII), also comprise part of the [present] invention. The invention consequently pertains to compounds of general formula (XXIV) below: 3

[0023] [in which] wherein R1 to R6 have the same meanings as in formula (I) above and R and R′, which are [identical] the same, represent either an —OH group or a group of formula —P(R7)(R8) in which R7 and R8 have the same meanings as in formula (I).

[0024] The following can be cited as dissymmetric chiral diphosphines of formula (I):

[0025] 6-methoxy-5′,6′-benzo-2,2′-bis(diphenylphosphino) biphenyl (S).

[0026] 4,5,6-trimethyl-5,6′-benzo-2,2′-bis(diphenylphosphino) biphenyl (R).

[0027] 6-methoxy-5′,6′-methylenedioxo-2,2′-bis9-diphenylphosphino) biphenyl (S), and [-] 6′-methoxy-5,6-methylenedioxo-2,2′-bis(diphenylphosphino) biphenyl (S).

[0028] Please replace the paragraph spanning pages 3 and 4 with the following:

[0029] A first group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (I) according to the invention corresponds to formula (III) below:

MxHyXz(L)2 (Sv)p  (III)

[0030] [in which:]

[0031] wherein [-] M represents a metal such as ruthenium, rhodium or iridium;

[0032] X represents a halogen such as chlorine, bromine, fluorine or iodine;

[0033] Sv represents a tertiary amine, a ketone or an ether;

[0034] L represents an (R) or (S) chiral diphosphine of formula (I) above;

[0035] y is a whole number equal to 0 or 1;

[0036] x is a whole number equal to 1 or 2;

[0037] z is a whole number equal to 1, 2 or 4; and

[0038] p is a whole number equal to 0 or 1.

[0039] On page 4, please replace the second and third full paragraphs with the following:

[0040] The complexes of formula (IIIA) are those of formula (III) in which y=0 and then x=2, z=4 and p=1, corresponding to the following formula:

M2X4L2 (Sv)  (IIIA)

[0041] [in which:]

[0042] wherein M, X, L and Sv have the same meanings as in formula (III).

[0043] The compounds of formula (IIIB) are those of formula (m) in which y 1 then x=1, z=1 and p=0, corresponding to the following formula:

MHXL2  (IIIB)

[0044] [in which:]

[0045] wherein M, X and L have the same meanings as in formula (III) and H represents a hydrogen atom.

[0046] A second group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (1) according to the invention corresponds to the following formula (IV):

MXj(Ar)mLYn  (IV)

[0047] [in which:]

[0048] wherein [-] M, X and L have the same meanings as in formula (III),

[0049] Ar represents an olefin such as ethylene, 1,3-butadiene, cyclohexadiene, norbonadiene, cycloocta-1,5-diene, a pi-allyl, a nitrile such as acetonitrile, an arene of formula (V): 4

[0050] [in which] wherein R9, R10, R1, R12, R13 and R14, which can be [identical] the same or different, are selected from among a hydrogen atom, a C1-5 alkyl group, an isoalkyl group, a tertioalkyl group, an alkoxy group, said groups optionally comprising one or more heteroatoms such as O, N and Si,

[0051] Y represents an anion such as ClO4−, BF4− or PF6− and

[0052] j is a whole number equal to 0 or 1, m is a whole number equal to 1, 2 or 4, and n is a whole number equal to 1 or 2.

[0053] On page 5, please replace the first and second full paragraphs with the following:

[0054] A third group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (I) according to the invention corresponds to the following formula (VI):

[[ ](MX(P(R15)2(R16))L[ ]])2X  (VI)

[0055] [in which:]

[0056] wherein M, X and L have the same meanings as in formula (III) and R15 and R16, which can be [identical] the same or different, represent a phenyl or a phenyl substituted by an alkyl, an alkoxy or a dialkylamino.

[0057] A fourth group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (I) according to the invention corresponds to formula (VII) below:

M(L)Z2  (VII)

[0058] [in which:]

[0059] wherein M and L have the same meanings as in formula (E) and Z represents an acetate group of formula R17COO−, diacetate group of formula −OOCR17COO—, an aminoacetate group of formula R17CH(NH2)COO− in which R17 represents a C1-4 alkyl, a C1-4 halogenoalkyl or an optionally substituted phenyl.

[0060] Please replace the paragraph spanning pages 5 and 6 with the following:

[0061] A fifth group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (I) according to the invention corresponds to formula (VIII) below:

[[ ](M(L)WXk[ ]])nZ′p  (VIII)

[0062] [in which:]

[0063] wherein M, L and X have the same meanings as in formula (III);

[0064] W represents zinc, aluminum, titanium or tin;

[0065] Z represents:

[0066] either an acetate group of formula R18COO− in which R18 represents a C1-4 alkyl, a C1-4 halogenoalkyl, an optionally substituted phenyl, and in this case n=1 and p=2, and when W is Zn then k=2, when W is Al then k=3, and when W is Ti or Sn then k=4,

[0067] or a tertiary amine such as triethylamine, and in this case n=2 and p=1, and when W is Zn then k=4, when W is Al then k=5 and when W is Ti or Sn then k=6.

[0068] On page 6, please replace the first through fourth full paragraphs with the following:

[0069] A sixth group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (I) according to the invention corresponds to formula (IX) below:

MH(L)2Y  (IX)

[0070] [in which:]

[0071] wherein M and L have the same meanings as in formula (III), H represents a hydrogen atom and Y represents an anion such as ClO4−, BF4− or PF6−.

[0072] A seventh group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (I) according to the invention corresponds to formula (X) below:

M(L)Y2  (X)

[0073] [in which:]

[0074] wherein M and L have the same meanings as in formula (III) and Y represents an anion such as ClO4−, BF4− or PF6−.

[0075] An eighth group of diphosphino-metal complexes prepared using the chiral diphosphines of formula (I) according to the invention corresponds to formula (XI) below:

M(L)2Y  (XI)

[0076] [in which:]

[0077] wherein M and L have the same meanings as in formula (III) and Y represents an anion such as ClO4−BF4− or PF6−.

[0078] As previously stated, the (R) or (S) chiral diphosphines of formula (I) of the present invention are prepared by a method of the type described by D. CAI et al. (J. Org. Chem. 1994, p. 7180) from compounds of formula (XEII) then formula (XH) according to the reaction diagram represented in [figure] FIG. 1 [of the attached drawings].

[0079] On page 7, please replace the fourth and fifth paragraphs with the following:

[0080] The compound of formula (XI) is prepared from compounds of formula (XV) and (XIV) according to the reaction diagram shown in [figure] FIG. 2 [of the attached drawings].

[0081] In the reaction diagram represented in [figure] FIG. 2, a coupling reaction is implemented of the compound of formula (XV) below: 5

[0082] according to the method developed by B. H. Lipschutz, so as to form the diastereoisomerically pure compound of formula (XIV) below: 6

[0083] The compound of formula (XV) is obtained by a Mitsunobu reaction between the compounds of formula (XVI) and (XVII) below: 7

[0084] [in which] wherein R1 to R6, R19 and X′ have the same meanings as in formulas (XV) and (XIV), and R17 represents an alkyl aryl or arylalkyl group such as methyl, ethyl, phenyl or benzyl.

[0085] On page 8, please replace the third paragraph with the following:

[0086] These two successive Mitsunobu reactions are represented in the reaction diagram shown in [figure] FIG. 3 [of the attached drawings].

[0087] On page 8, please replace the fifth paragraph with the following:

[0088] Thus, the compounds of formulas (XVI) and (XVII) are obtained respectively from 2-halo-genophenolic compounds of formulas (XVIIIA) and (XVIIIB) which are themselves obtained respectively from phenolic compounds of formulas (XIXA) and (XIXB) below according to the reaction diagram shown in [figure] FIG. 4 [of the attached drawings]: 8

[0089] According to the process described in the European patent application published as no. 184 057, the complexes of formula (III) can be prepared from a compound of formula (XX):

MX2(COD)2  (XX)

[0090] [in which] wherein M and X have the same meanings as in formula (III) and COD represents cyclooctadiene.

[0091] Please replace the paragraph spanning pages 8 and 9 with the following:

[0092] Similarly, according to the process described in the European patent application published as no. 366 390, the complexes of formula (IV) can be prepared from compounds of formula (XXI):

[[ ](MX2(Ar0[ ]])2  (XXI)

[0093] [in which] wherein M and X have the meanings as in formula (III).

[0094] Finally, according to the process described in the European patent application published as no. 470 756, the compounds of formula (VI) can be prepared from compounds of formula (XXII):

[[ ](MX(P(R15)2(R16))(DMA)[ ]]hX  (XXII)

[0095] [in which:]

[0096] wherein M, X, R15 and R16 have the same meanings as in formula (VI) and DMA represents dimethylacetamide.

[0097] The present invention also pertains to the diphosphino-metal complexes of formulas (III), (IV), (VI), (VII), (VIII), (IX), (X) and (XI) as well as their use as catalyst in asymmetric catalysis procedures and more particularly their use in asymmetric hydrogenation or hydrogen transfer procedures of unsaturated compounds bearing functional groups of formula (XXI) below: 9

[0098] wherein A and B are different and selected from among a C1-5 alkyl group, an aryl group, a C1-7 hydroxycarbonyl group, a C1-7 alkoxycarbonyl group, a C1-10 aryloxycarbonyl group, a C1-7 halogenoalkyl group, a heteroaryl group, an optionally saturated cycloalkyl group, said alkyl, aryl and cycloalkyl groups optionally comprising one or more subsuituents selected from among a halogen such as chlorine, fluorine or bromine, a NO2 group, a C1-5 alkyl group, a C1-5 alkoxy group, an optionally fused C1-7 cycloalkyl group, an optionally fused aryl group possibly substituted by a halogen, a C1-5 alkyl, a C1-5 alkoxy, [said] the alkyl, cycloalkyl, aryl groups optionally comprising one or more heteroatoms such as O, N or Si,

[0099] or A and B together form a C2-6 substituted alkyl group, an optionally saturated C3-9 cycloalkyl group, a C5-10aryl group, [said] the groups being optionally substituted by a C1-5 alkyl, a halogen, a hydroxy, a C5-10 alkoxy, [said] the groups being optionally substituted by a C1-5 alkyl, a halogen, a hydroxy, a C1-5 alkoxy, an amino such as —NH2, —NHR20, —N(R20)2, a sulfino, a sulfonyl, in which R20 represents an alkyl, an alkoxy or an alkylcarbonyl, [said] the alkyl, cycloalkyl and aryl groups optionally comprising one or more heteroatoms such as O, N, S or Si;

[0100] Q1 represents an oxygen, a —NR21, —NOR21 or —C(R22)2 group in which R21 is selected from among a C1-5 alkyl an aryl group or a heteroaryl group substituted by a C1-4 alkyl.

[0101] On page 10, please replace the second full paragraph with the following:

[0102] A preferred asymmetric hydrogenation procedure according to the invention comprises the treatment of a compound of formula (XXIII) in a suitable solvent in the presence of a catalytic complex of formula (III), (IV), (VI), (VII), (VII), (IX), (X) or (XI) as catalyst under the following preferred operating conditions:

[0103] a temperature comprised between 0 and +150° C.,

[0104] a hydrogen pressure between 1 and 100 bar,

[0105] an amount of catalyst in relation to the amount of substrate comprised between {fraction (1/50,000)} and {fraction (1/10)}, preferably between {fraction (1/10,000)} and {fraction (1/10)}, and especially preferably between {fraction (1/10,000)} and 1/1000.

Claims

29. (New) a compound of formula (XXIV) below:

30. (New) An (R) or (S) chiral diphosphine of formula (I):

31. (New) A compound of formula (XIII) below:

32. (New) An (R) or (S) chiral diphosphine of formula (I) according to claim 30, selected from the group consisting of: 6-methoxy-5′,6′-benzo-2,2′-bis(diphenylphosphino) biphenyl (S), 4,5,6-trimethyl-5,6′-benzo-2,2′-bis(diphenylphosphino) biphenyl (R), 6-methoxy-5′,6′-methylenedioxo-2,2′-bis(diphenylphosphino) biphenyl (S) and 6′-methoxy-5,6-methylenedioxo-2,2′-bis(diphenylphosphino) biphenyl (S).

33. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (III):

34. (New) A diphosphino-metal complex according to claim 30, corresponding to formula (IIIA) below:

35. (New) A diphosphino-metal complex according to claim 30, corresponding to formula (III) below:

36. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (IV) below:

37. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (VI) below:

38. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (VII) below:

39. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (VIII) below:

40. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (IX):

41. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (X) below:

42. (New) A diphosphino-metal complex comprising an (R) or (S) chiral diphosphine according to claim 30, corresponding to formula (XI) below:

43. (New) A for the asymmetric hydrogenation of an unsaturated compound having functional groups corresponding to formula (XXII below:

44. (New) The method according to claim 43, wherein the duration of hydrogenation is greater than or equal to one hour.

45. (New A method for preparation of a compound of formula (I) according to claim 30, comprising: reacting the compound of formula (XI below: 18with trifluoromethane sulfonic anhydride to form the compound of formula (XI) below: 19reacting the compound of formula (XII) with a phosphine of formula HP(R7)(R8) wherein R7 and R8, which can be the same or different, represent an aryl optionally substituted by an alkyl, a halogen or an alkoxy, or represents a C5-6.

46. (New) The method according to claim 45, comprising preparation of the compound of formula (XI) by a coupling reaction of the compound of formula (XV) below:

47. (New) The method according to claim 46, comprising preparation of the compound of formula (XV) by a Mitsunobu reaction between the compounds of formula (XVI) and (XVI) below:

48. (New) The method according to claim 47, comprising preparation of the compound of formula (XVI) by a Mitsunobu reaction from a compound of formula (XVIIIA) below:

49. (New) The method according to claim 47, comprising preparation of the compound of formula (XVII) from a compound of formula (XVIIIB):

50. (New) The method according to claim 48, comprising preparation of the compound of formula (XVIIIA) from a compound of formula (XIXA):

51. (New) The method according to claim 49, comprising preparation of the compound of formula (XVIIIB) from a compound of formula (XIXB):