Concise Synthesis of Complicated Polypropionates through One-Pot Dissymmetrical Two-Directional Chain Elongation
作者:Claudia J. Exner、Maris Turks、Freddy Fonquerne、Pierre Vogel
DOI:10.1002/chem.201003264
日期:2011.4.4
reported that allows the preparation of complex long‐chain polyketide fragments with more than ten stereogenic centers through a carefully designed desymmetrization process. An allylbissilane is combined, under the appropriate reaction conditions, with two different 1,3‐dioxy‐1,3‐dienes permitting the construction of a 13‐membered polypropionate precursor in one pot. Four stereocenters are selectively
本文报道了二氧化硫介导的氧化烯丙基化级联反应的一项重大突破,它允许通过精心设计的脱对称过程制备具有十多个立体异构中心的复杂长链聚酮化合物片段。在适当的反应条件下,将烯丙基二硅烷与两种不同的1,3-二氧基-1,3-二烯结合,从而在一个罐中构建13元聚丙烯酸酯前体。在此过程中有选择地创建了四个立体中心。如此获得的伪C 2或C S对称产物通过选择性脱保护而脱对称,并且可以使用羟醛化学方法在两个方向上选择性地伸长。