Ti(III)-Catalyzed Cyclizations of Ketoepoxypolyprenes: Control over the Number of Rings and Unexpected Stereoselectivities
作者:Sara P. Morcillo、Delia Miguel、Sandra Resa、Ana Martín-Lasanta、Alba Millán、Duane Choquesillo-Lazarte、Juan M. García-Ruiz、Antonio J. Mota、José Justicia、Juan M. Cuerva
DOI:10.1021/ja411942h
日期:2014.5.14
to control the number of cyclization steps in bioinspired radical (poly)cyclizations involving epoxypolyenes containing keto units positioned along the polyene chain. This approach provides an unprecedentedly straightforward access to natural terpenoids with pendant unsaturated side chains. Additionally, in the case of bi- and tricyclizations, decalins with cis stereochemistry have been obtained as a
我们描述了一种新策略来控制生物启发自由基(多)环化中环化步骤的数量,其中涉及包含沿着多烯链定位的酮单元的环氧多烯。这种方法提供了前所未有的直接访问具有悬垂不饱和侧链的天然萜类化合物。此外,在二环和三环的情况下,由于酮的存在,已获得具有顺式立体化学的十氢萘。顺式融合加合物的优先形成使用 DFT 计算进行了合理化。这一结果在仿生环化中是前所未有的,并且允许获得具有这种立体化学的天然萜类化合物以及非天然类似物。