Asymmetric Binary-Acid Catalysis with InBr3 in the Inverse-Electron-Demanding Hetero-Diels-Alder Reaction of Mono- and Bis-Substituted Cyclopentadienes: Remote Fluoro-Effect on Stereocontrol
作者:Jian Lv、Long Zhang、Shenshen Hu、Jin-Pei Cheng、Sanzhong Luo
DOI:10.1002/chem.201103340
日期:2012.1.16
Remote F effect: Unprecedented hetero‐Diels–Alder reactions of mono‐ and bis‐substituted cyclopentadienes have been realized by an asymmetric binary‐acid catalyst that synergistically combines a chiral phosphoric acid 1 h/InBr3 with good periselectivity, high regioselectivity, and excellent stereoselectivity. Substituent mapping of the chiral phosphoric acid indicates a dramatic remote ortho‐fluoro
遥远的F效应:单和双取代的环戊二烯的前所未有的杂狄尔斯-阿尔德反应已通过不对称的二元酸催化剂实现,该催化剂将手性磷酸1 h / InBr 3协同结合,具有良好的选择性,高区域选择性和优异的选择性立体选择性。手性磷酸的取代基作图表明对立体控制有显着的远距离邻氟影响(参见方案)。