Dichloromethane as a Chlorination Reagent for α-Bromocarbonyl Compounds in the Presence of a Copper Catalyst
作者:Kentaro Takeuchi、Syo Ishida、Takashi Nishikata
DOI:10.1246/cl.170062
日期:2017.5.5
We found that dichloromethane is a powerful chlorinatingreagent for the congested 3° and 2° Csp3–Br bond of α-bromocarbonyl amides, esters, and ketones. In the presence of an appropriate copper complex as a catalyst, the desired chlorination occurred within an hour. Control experiments revealed that in situ-generated CuCl2 is a key chlorinating agent that reacts with the 3° or 2° alkyl radicals generated