Transition Metal‐free
<i>gem</i>
‐difluorocyclopropanation of Alkenes with CF
<sub>3</sub>
SiMe
<sub>3</sub>
−NaI System: a Recipe for Electron‐deficient Substrates
作者:Pavel S. Nosik、Sergey V. Ryabukhin、Oleksandr O. Grygorenko、Dmitriy M. Volochnyuk
DOI:10.1002/adsc.201801006
日期:2018.11.5
Reaction of various electron‐deficientalkenes, as well as functionalized styrene derivatives with CF3SiMe3−NaI system is studied. Relative reactivity of the substrates is established. It is shown that many α,β‐unsaturated esters can be difluorocyclopropanated efficiently under “slow addition protocol” conditions, which provides access to mono‐ and spirocyclic gem‐difluorocyclopropyl‐substituted carboxylic