Boron Chelates Derived from <i>N</i>-Acylhydrazones as Radical Acceptors: Photocatalyzed Coupling of Hydrazones with Carboxylic Acids
作者:Igor A. Dmitriev、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1021/acs.orglett.1c03501
日期:2021.11.19
Difluoroboryl complexes obtained from N-acyl hydrazones upon brief treatment with boron trifluoride and allylic silane serve as efficient acceptors of alkyl radicals. The reaction of the boryl chelates with carboxylic acids in the presence of an acridine-type photocatalyst leading to N-acyl hydrazides is described. The efficiency of addition at the C═N bond of the chelates is determined by the formation
用三氟化硼和烯丙基硅烷短暂处理后从N-酰基腙中获得的二氟硼基配合物可作为烷基自由基的有效受体。描述了硼基螯合物与羧酸在吖啶型光催化剂存在下产生N-酰基酰肼的反应。在螯合物的 C=N 键上的加成效率取决于由含硼杂环稳定的氮中心自由基的形成。