作者:Ryo Katsuta、Naoko Masada、Yuichiro Shimodaira、Saeko Ueda、Arata Yajima、Tomoo Nukada
DOI:10.1016/j.tet.2017.02.023
日期:2017.3
The first synthesis of (7S,9R)-decarestrictine H and (7R,9R)-decarestrictine H as well as the improved synthesis of decarestrictine J were achieved. The overall yields of (7S,9R)-decarestrictines H and J were 20.9% each in nine to ten steps from (R)-Roche ester using a unified synthetic route via esterification with 3,3-ethylenedioxyhex-5-enoic acid and ring-closing metathesis, which were the key steps
实现了(7 S,9 R)-去卡地丁H和(7 R,9 R)-去卡地丁H的首次合成以及去卡地丁J的改进合成。(3 S,9 R)-去卡地那汀H和J的总收率分别为20.9%,从(R)-罗氏酯经过9到10个步骤,采用3,3-乙二氧基己基-5-烯酸酯化的统一合成路线和闭环复分解是关键步骤。通过比较天然产物和脱卡因碱H的合成差向异构体的光谱数据,确定非卡因碱H的相对立体化学为7,9- syn。