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 chlorinating reagent 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
我们发现二氯甲烷是一种强大的氯化试剂,可用于处理 α-溴羰基酰胺、酯和酮的拥挤的 3° 和 2° Csp3-Br 键。在合适的铜配合物作为催化剂的存在下,所需的氯化在一小时内发生。对照实验表明,原位生成的 CuCl2 是一种关键的氯化剂,可与 α-溴羰基化合物和 Cu(I) 盐反应生成的 3° 或 2° 烷基自由基反应。