Stereoselective Installation of Five Contiguous Stereogenic Centers in a Double Aldol–Tishchenko Cascade and Evaluation of the Key Transition State through DFT Calculation
作者:Pamela Mackey、Aneta Turlik、Kaori Ando、Mark E. Light、K. N. Houk、Gerard P. McGlacken
DOI:10.1021/acs.orglett.1c02179
日期:2021.8.20
The stereoselective formation of 5 contiguous chiral centers in a single pot reaction is demonstrated using an aldol, aldol–Tishchenko reaction of N-tert-butyl sulfinimines. One diastereoisomer (from 32 possibilities) predominates, and a series of cyclic and acyclic 3-amino-1,5-diol derivatives are synthesized in good yields (up to 80%) and excellent diastereoselectivities (up to >98:2 dr). Investigations
5个连续的手性中心的在单锅反应立体选择性形成是使用醇醛,的羟醛-tishchenko反应证实ñ -叔丁基sulfinimines。一种非对映异构体(来自 32 种可能性)占主导地位,并以良好的产率(高达 80%)和出色的非对映选择性(高达 >98:2 dr)合成了一系列环状和非环状 3-氨基-1,5-二醇衍生物。研究支持两个可逆的羟醛步骤和多个中间体,这些中间体在 Curtin-Hammett 现象中通过显着选择性的、不可逆的 Tishchenko 还原漏斗。使用溶剂化 (THF) 模型的 DFT 计算揭示了在最终不可逆 Tishchenko 步骤中控制立体选择性的因素。