Process for preparing phosphonyloxyacyl amino acids and derivatives
申请人:——
公开号:US04885380A1
公开(公告)日:1989-12-05
A process is provided for preparing phosphonyloxyacylamino acids and derivatives thereof having the structure ##STR1## wherein ##STR2## which includes the steps of treating a phosphonic acid dichloride of the structure ##STR3## with an .alpha.-hydroxy acid of the structure ##STR4## in the presence of base such as triethylamine at reduced temperatures to form the cyclic mixed anhydride of the structure ##STR5## (which is a new intermediate) and reacting the cyclic mixed anhydride with an amino acid or ester of the structure HX in the presence of base such as triethylamine produces the ACE inhibitor compound ##STR6## In an alternative process, the cyclic anhydride is quenched with water to form the diacid ##STR7## which is treated with a condensing agent such as dicyclohexyl carbodiimide (DCC), 1,1-carbonyldiimidazole (CDI) or thionyl chloride followed by quenching with the amion acid HX produces the above ACE inhibitor compound. In another variation of the process of the invention, the above cyclic anhydride is treated with an alcohol of the structure R.sub.3 OH to form the phosphonic acid diester ##STR8## which may be coupled with the amino acid or ester HX to form the ACE inhibitor ##STR9##
Process for preparing phosphonyloxyacyl amino acids and derivates thereof
申请人:E.R. Squibb & Sons, Inc.
公开号:EP0237264A2
公开(公告)日:1987-09-16
A process is provided for preparing phosphonyloxyacylamino acids and derivatives thereof having the structure
wherein
which includes the steps of treating a phosphonic acid dichloride of the structure
with an a-hydroxy acid of the structure
in the presence of base such as triethylamine at reduced temperatures to form the cyclic mixed anhydride of the structure
(which is a new intermediate) and reacting the cyclic mixed anhydride with an amino acid or ester of the structure
HX
in the presence of base such as triethylamine produces the ACE inhibitor compound
In an alternative process, the cyclic anhydride is quenched with water to form the diacid
which is treated with a condensing agent such as dicyclohexyl carbodiimide (DCC), 1,1-carbonytdiimidazole (CDI) or thionyl chloride followed by quenching with the amino acid
HX
produces the above ACE inhibitor compound.
In another variation of the process of the invention, the above cyclic anhydride is treated with an alcohol of the structure
R30H
to form the phosphonic acid diester
which may be coupled with the amino acid or ester
HX
to form the ACE inhibitor