Novel protection of 1,2-diol for trans-dihydroxycyclopentene ring construction by the C H insertion of alkylidene carbene: Formal total synthesis of (+)-trehazolin
作者:Susumu Ohira、Atsuhito Kuboki、Yoshimi Takimoto、Kyosuke Matsuda、Saori Itasaki、Yuki Urushibata、Yoshiyuki Takano、Yuuki Nakamura
DOI:10.1016/j.tetlet.2019.151085
日期:2019.9
The chiral vicinal diol was protected as 6-methylene-1,4-dioxepane to construct a cyclopentene ring by the CH insertion of alkylidene carbene. The removal of the protecting group was achieved in a few steps, affording the corresponding diol in a reasonable yield. Using these reactions, the known synthetic intermediate for (+)-trehazolin was synthesized from d-diethyl tartrate. In addition, a short
通过亚烷基卡宾的C H插入,将手性邻位二醇保护为6-亚甲基-1,4-二氧戊环,以构建环戊烯环。只需几个步骤即可除去保护基,以合理的收率得到相应的二醇。使用这些反应,由酒石酸d-二乙酯合成了已知的(+)-trehazolin合成中间体。另外,描述了从d-甘露糖醇衍生物到中间体的短路径。