Access to Cyanoimines Enabled by Dual Photoredox/Copper-Catalyzed Cyanation of <i>O</i>-Acyl Oximes
作者:Hao Zhang、Ziyan Wei、Ai Hua Zhang、Shouyun Yu
DOI:10.1021/acs.orglett.0c02659
日期:2020.9.18
An efficient strategy for the synthesis of pharmaceutically important and synthetically useful cyanoimines, as well as cyanamides, has been described. This strategy is enabled by dual photoredox/copper-catalyzed cyanation of O-acyl oximes or O-acyl hydroxamides. This state of the art protocol for cyanoimines and cyanamides features readily available starting materials, mild reaction conditions, good functional group tolerance, and operational simplicity. The resultant cyanoimines can be transformed into structurally diverse and functionally important N-containing heterocycles.
Formation of Xanthone Oxime and Related Compounds Using a Combination of tert-Butyl Nitrite and Potassium Hexamethyldisilazide
Synthesis of xanthone oxime and related compounds via nitrosation of the dibenzylic position using a combination of tert-butyl nitrite and potassium hexamethyldisilazide is described. The reaction conditions are effective for the synthesis of xanthone oxime as well as thioxanthone, acridone, and anthrone oximes, which have been difficult to synthesize from the corresponding ketones by conventional dehydrative condensation with hydroxylamine.