Total Synthesis of (−)-Virginiamycin M<sub>2</sub>: Application of Crotylsilanes Accessed by Enantioselective Rh(II) or Cu(I) Promoted Carbenoid Si–H Insertion
作者:Jie Wu、James S. Panek
DOI:10.1021/jo202119p
日期:2011.12.16
A stereoselective synthesis of the antibiotic (−)-virginiamycin M2 is detailed. A convergent strategy was utilized that proceeded in 10 steps (longest linear sequence) from enantioenriched silane (S)-15. This reagent, which was prepared via a Rh(II)- or Cu(I)-catalyzed carbenoid Si–H insertion, was used to introduce the desired olefin geometry and stereocenters of the C1–C5 propionate subunit. A modified
详细介绍了抗生素(-)-维吉尼亚霉素M 2的立体选择性合成。从10个步骤(最长的线性顺序)中使用了对映体富集硅烷(S)-15的收敛策略。该试剂是通过Rh(II)或Cu(I)催化的类胡萝卜素Si-H插入制备的,用于引入所需的烯烃几何形状和C1-C5丙酸酯亚基的立体中心。改良的Negishi交叉偶联或有效的醇盐定向的钛介导的炔烃-炔烃还原偶联策略用于组装三取代的(E,E)-二烯。未充分利用的后期SmI 2介导的大环化被用于构建天然产物的23元大环支架。