A practical synthesis of Entecavir (1) has been accomplished in 10 steps with 21% overall yield. The key steps to construct the five-membered carbocyclic framework 2 are a ring-closing metathesis and a diethyl-aluminum 2,2,6,6-tetramethyl piperidide (DA-TMS) mediated epoxide isomerization. Furthermore, the guanine was introduced by modified Mitsunobu reaction. (C) 2012 Elsevier Ltd. All rights reserved.
Entecavir synthesis method and intermediate compound thereof
申请人:Zheng Zhiguo
公开号:US09309249B2
公开(公告)日:2016-04-12
The present invention relates to a preparation method for a medicine and an intermediate compound thereof, specifically, relates to a preparation method for entecavir, an intermediate compound thereof, and a synthesis method for the intermediate compound.