作者:William T. Lambert、William R. Roush
DOI:10.1021/ol052321r
日期:2005.11.1
[reaction: see text] An efficient synthesis of the tricyclic A-B subunit 2 of angelmicin B is described. A formal three-component coupling of aldehydes 4 and 6 with gamma-silylallylborane 7 was employed to assemble the tetrahydrofuranyl core of 2, a strategy highlighted by the stereoselective [3 + 2] annulation of allylsilanes 5a/5b with aldehyde 4. The efficiency of the [3 + 2] annulation was greatly improved
[反应:见正文]描述了当归霉素B的三环AB亚基2的有效合成。使用醛4和6与γ-甲硅烷基烯丙基硼烷7的正式三组分偶联来组装2的四氢呋喃基核,该策略以烯丙基硅烷5a / 5b与醛4的立体选择性[3 + 2]环合突出。与烯丙基苯基二甲基硅烷5a相比,通过使用烯丙基苯甲基二甲基硅烷5b大大改善了[3 + 2]环化。