Methyl 2,2-Difluoro-2-(fluorosulfonyl)acetate, a Difluorocarbene Reagent with Reactivity Comparable to That of Trimethylsilyl 2,2-Difluoro-2-(fluorosulfonyl)acetate (TFDA)
摘要:
Under specific high concentration, high temperature conditions, methyl 2,2-difluoro-2-(fluorosulfonyl)acetate (MDFA) has been found to act as a very efficient source of difluorocarbene, exhibiting carbene reactivity characteristics comparable to those exhibited by trimethylsilyl 2,2-difluoro-2-(fluorosulfonyl)acetate (TFDA). For example, in reaction with highly unreactive n-butyl acrylate and using only 2 equiv of MDFA, a yield of 76% of difluorocyclopropane product was obtained after 2 days.
Difluorocarbene Addition to Alkenes and Alkynes in Continuous Flow
作者:Pauline Rullière、Patrick Cyr、André B. Charette
DOI:10.1021/acs.orglett.6b00573
日期:2016.5.6
The first in-flow difluorocarbene generation and addition to alkenes and alkynes is reported. The application of continuousflow technology allowed for the controlled generation of difluorocarbene from TMSCF3 and a catalytic quantity of NaI. The in situ generated electrophilic carbene reacts smoothly with a broad range of alkenes and alkynes, allowing the synthesis of the corresponding difluorocyclopropanes
Pd/IPr<sup>BIDEA</sup>-Catalyzed Hydrodefluorination of <i>gem</i>-Difluorocyclopropanes: Regioselective Synthesis of Terminal Fluoroalkenes
作者:Huijun Qian、Zachary P. Cheng、Yani Luo、Leiyang Lv、Shuming Chen、Zhiping Li
DOI:10.1021/jacs.3c07992
日期:2024.1.10
Developing new strategies to enable chemo- and regioselectivereductions is an important topic in chemical research. Herein, an efficient and regioselective Pd/IPrBIDEA-catalyzed ring-opening hydrodefluorination of gem-difluorocyclopropanes to access terminal fluoroalkenes is developed. The success of this transformation was attributed to the use of 3,3-dimethylallyl Bpin as a novel hydride donor.