Total synthesis of (8S,11R,12R)- and (8R,11R,12R)-topsentolide B2 diastereomers and assignment of the absolute configuration
作者:Rodney A. Fernandes、Pullaiah Kattanguru
DOI:10.1016/j.tetasy.2011.10.020
日期:2011.11
An improved total synthesis of (8S,11R,12R)- and (8R,11R,12R)-topsentolide B2 diastereomers has been completed in eight steps with overall yields of 10.2% and 10.4%, respectively. The key steps involve a regioselective asymmetric dihydroxylation, diastereoselective Roush allylation, and ring closing metathesis. The stereochemistry of natural topsentolide B2 has been determined to be (8S,11R,12R) by
改进的(8 S,11 R,12 R)-和(8 R,11 R,12 R)-托酚内酯B 2非对映异构体的总合成已通过八个步骤完成,总收率分别为10.2%和10.4%。关键步骤涉及区域选择性不对称二羟基化,非对映选择性Roush烯丙基化和闭环易位。通过比旋光度的比较,确定了天然托普托莱德B 2的立体化学为(8 S,11 R,12 R)。