作者:Shinichiro Fuse、Ayako Ikebe、Kazuya Oosumi、Tomoya Karasawa、Keisuke Matsumura、Miho Izumikawa、Kohei Johmoto、Hidehiro Uekusa、Kazuo Shin-ya、Takayuki Doi、Takashi Takahashi
DOI:10.1002/chem.201500703
日期:2015.6.22
AbstractAn asymmetric total synthesis of ent‐pyripyropene A was achieved by a convergent synthetic route. We used our originally developed TiIII‐catalyzed radical cyclization to construct an AB‐ring portion that consisted of a trans‐decalin skeleton with five contiguous stereogenic centers. The coupling between the AB‐ring and the DE‐ring portions, and a subsequent C‐ring cyclization, led to the total synthesis of ent‐pyripyropene A. An evaluation of the insecticidal activity of ent‐pyripyropene A against two aphid species revealed that ent‐pyripyropene A was 35–175 times less active than naturally occurring pyripyropene A. This result indicated that the biological target of pyripyropene A recognizes the absolute configuration of pyripyropene A.