Converting a Birch Reduction Product into a Polyketide: Application to the Synthesis of a C<sup>1</sup>-C<sup>11</sup>Building Block of Rimocidin
作者:Luc Nachbauer、Reinhard Brückner
DOI:10.1002/ejoc.201201112
日期:2012.12
A stereoselective synthesis of a C1–C11 building block for the polyol-polyene antibiotic rimocidin has been developed. Its functional groups originate from a disubstituted indane, which underwent Birch reduction, and oxidative cleavage. This provided a dihydropyranone with a β-keto ester side-chain. The latter was subjected to a Noyori hydrogenation (ds > 97:3). An oxy-Michael addition gave a mixture
已经开发了用于多元醇-多烯抗生素 rimocidin 的 C1-C11 结构单元的立体选择性合成。它的官能团来源于二取代的茚满,经过 Birch 还原和氧化裂解。这提供了具有β-酮酯侧链的二氢吡喃酮。后者进行 Noyori 氢化(ds > 97:3)。氧-迈克尔加成得到两种螺缩酮的混合物。然后 Luche 减少导致比例为 80:10:10 的三个螺酮。通过色谱分离副产物之一和通过非对映异构体选择性硫缩酮化分离另一种副产物,主要的螺缩酮变得可分离。剩余的螺缩酮开环得到二硫戊环。使用减少气味的后处理程序,将其 CO2Me 基团转化为目标化合物的 1,3-二噻烷单元(即 47),