Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1985-01-22
1986-06-10
Sutto, Anton H.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
558137, 558386, 558167, 546 22, 546 23, 548112, 548113, C07F 932, C07F 965
Patent
active
045941998
ABSTRACT:
A method is provided for preparing phosphinic acid prodrug intermediates which are useful in preparing phosphinic acid angiotensin-converting enzyme inhibitors which method includes the step of coupling a phosphonous acid or its ester of the structure ##STR1## wherein R is H or lower alkyl and R.sup.1 is lower alkyl, aryl, arylalkyl, cycloalkyl or cycloalkylalkyl, with a conjugated compound of the structure ##STR2## wherein R.sup.2, R.sup.3 and R.sup.4 may be the same or different and each is independently H, lower alkyl or aryl, and Z is --CO.sub.2 R.sup.5 (wherein R.sup.5 is H or lower alkyl), ##STR3## (wherein R.sup.6 is H, lower alkyl aryl or arylalkyl), ##STR4## (wherein R.sup.7 and R.sup.8 are the same or different and are selected from the group consisting of H, lower alkyl, aryl, aryl-lower alkyl, cycloalkyl or cycloalkylalkyl and at least one of R.sup.7 and R.sup.8 is other than H, or R.sup.7 and R.sup.8 can be taken together with N to form a 5-, 6- or 7-membered heterocyclic ring ##STR5## which may or may not include a COOR.sup.5 substituent, which 5- or 6-membered N-containing ring may or may not be fused to an aryl ring), in the presence of a silylating agent, to form the phosphonic acid intermediate of the structure ##STR6## wherein R, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 and Z are as defined above.
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Thottathil et al., "Tetrahydron Letters"; vol. 25, #42, (1984) pp. 4741-4744.
E. R. Squibb & Sons Inc.
Levinson Lawrence S.
Rodney Burton
Sutto Anton H.
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