contain a functionalized ester group at 17 alpha has been prepared and examined to separate their systemic activity from topical antiinflammatory activity. Introduction of the functionalized ester group at 17 alpha was carried out by an acid-catalyzed formation of cyclic orthoesters with 17 alpha,21-hydroxyl groups of corticosteroids and subsequent acid-catalyzedhydrolysis. As for the functional group
Discovery of Annulating Reagents Enabling the One-Step and Highly Stereoselective Synthesis of Cyclopentyl and Cyclohexyl Cores
作者:Jade McDaniel、Christopher A. Farley、Antonio Ramirez、Bhupinder Sandhu、Amy Sarjeant、Qing Shi、Arthur Han、William P. Gallagher、John Hynes、T. G. Murali Dhar、Francisco Gonzalez-Bobes、John R. Coombs、David Marcoux
DOI:10.1021/acs.orglett.0c03695
日期:2021.1.1
undergo cycloaddition with a variety of Michael acceptors to form cyclopentane/cyclohexane rings with excellent stereochemicalcontrol, generating only one of the eight possible diastereomers. This novel methodology has enabled the highly enantioselective and high yielding synthesis of novel chemotypes of pharmacological relevance.