new bifunctional C1 synthon: With bromomethyl silicate as a CH2 source, visible‐light‐induced cyclopropanation has been demonstrated to be amenable to the alkenes including Michael acceptors, styrene derivatives, and unactivated 1,1‐dialkyl ethylenes. In addition to the broad substrate scope, this radical‐polar crossover process is also characterized by its redox‐neutral process, mild conditions, and
Vitamin B<sub>12</sub>‐Photocatalyzed Cyclopropanation of Electron‐Deficient Alkenes Using Dichloromethane as the Methylene Source**
作者:John Hayford G. Teye‐Kau、Mayokun J. Ayodele、Spencer P. Pitre
DOI:10.1002/anie.202316064
日期:2024.1.8
We report a vitamin B12-photocatalyzed strategy for the cyclopropanation of electron-deficient alkenesusing dichloromethane (CH2Cl2) as the methylene source. The reaction has excellent functional group tolerance, is highly chemoselective, and the scope can be extended to other 1,1-dichloroalkanes for the preparation of D2-cyclopropyl and methyl-substituted cyclopropyl adducts, all of which are important