作者:Xiaoyu Liu、Xiaozhen Jiao、Qian Wu、Chengsen Tian、Renze Li、Ping Xie
DOI:10.1016/j.tetlet.2012.05.058
日期:2012.7
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.