Synthesis of o-(diphenylphosphinoyloxy)anilines by the rhodium-catalyzed reaction of nitroarenes and diphenylphosphine oxide
摘要:
A rhodium complex Rh(2)(OAc)(4) catalyzed the reaction of nitrobenzenes and diphenylphosphine oxide HP(=O)Ph(2) giving o-(diphenylphosphinoyloxy)anilines predominantly, which were accompanied by small amounts of the p-isomers. Nitorobenzenes possessing a bulky o-substituent, particularly o-(t-butyl)nitrobenzenes, underwent the reaction in high yields. The reaction is considered to involve the reductive formation of O-phosphinoyl-N-arylhydroxyamines from nitrobenzenes, and o-phosphinoyloxylation by the rearrangement. (C) 2010 Elsevier Ltd. All rights reserved.
A rhodium complex Rh(2)(OAc)(4) catalyzed the reaction of nitrobenzenes and diphenylphosphine oxide HP(=O)Ph(2) giving o-(diphenylphosphinoyloxy)anilines predominantly, which were accompanied by small amounts of the p-isomers. Nitorobenzenes possessing a bulky o-substituent, particularly o-(t-butyl)nitrobenzenes, underwent the reaction in high yields. The reaction is considered to involve the reductive formation of O-phosphinoyl-N-arylhydroxyamines from nitrobenzenes, and o-phosphinoyloxylation by the rearrangement. (C) 2010 Elsevier Ltd. All rights reserved.