The present invention is directed to 2-hydroxy-4-alkylidenecyclohexanealkanoic acids having a mercaptoalkanoic acid substituent at the 3-position. Esters and amides corresponding to the acids referred to above are also encompassed by the present invention. These compounds are useful in the treatment of bronchial asthma and they are obtained by the reaction of an appropriate 2,3-epoxy-4-alkylidenecyclohexanealkanoate with a mercapto alkanoic acid ester in the presence of a tertiary amine. The indicated process gives the esters of the present invention which can be hydrolyzed to the corresponding free acids by standard procedures. The compounds described can be subjected to other known reactions to give the other compounds of the present invention.
Conformationally restricted leukotriene antagonists. Stereoselective synthesis of some leukotriene D4 analogs
作者:Jeffrey S. Sabol、Philip M. Weintraub、Thomas H. Gieske、Robert J. Cregge
DOI:10.1016/s0040-4020(01)86751-x
日期:——
The stereocontrolled synthesis of conformationally restricted LTD4 analogs 2a, b is described. Epoxidation of enone 4 affords a 2.4:1 mixture of trans-epoxide 5 and cis-epoxide 9. Stereocontrolled elaboration of each epoxide to final product involves stereoselective Wittig olefination to Z-olefins 6 and 10, regiospecifie epoxide ring opening with methyl mercaptoacetate to diesters 8 and 12, and saponification