6-Acylaminopenicillanoyloxymethyl esters and 1-(6-acylaminopenicillanoyloxy)ethyl esters of 2-beta-acetoxymethyl-2-alpha-methyl-(5R)penam-3-alpha-carboxylic acid 1,1-dioxide are useful as antibacterial agents. The 6-aminopenicillanoyloxymethyl ester, the 1-(6-aminopenicillanoyloxy)ethyl ester and certain other mono-substituted methyl and ethyl esters of 2-beta-acetoxymethyl-2-alpha-methyl-(5R)penam-3-alpha-carboxylic acid 1,1-dioxide are useful intermediates to the aforesaid antibacterial agents.
Butylstannonic acid catalyzed transesterification of carboxylic esters
作者:Ricardo L.E. Furlán、Ernesto G. Mata、Oreste A. Mascaretti
DOI:10.1016/s0040-4039(98)00241-x
日期:1998.4
Butylstannonic acid is used as catalyst for transesterification of various carboxylic esters. This method is also applicable to acetylation/deacetylation of alcohols. (C) 1998 Elsevier Science Ltd. All rights reserved.