The reaction of 2-chloro-4-nitrophenol and the isomeric chloronitrobenzenes with LDA under aryne-forming conditions
摘要:
The unprecedented base-initiated generation of a nitrobenzyne and subsequent addition of preformed arylacetonitrile anion nucleophiles is reported. In all cases, 2-amino-5-nitro-3-benzo[b]furans are obtained as major product with small amounts of 3-arylmethyl-2-cyano-4-nitrophenols. A mechanism involving ring closure of phenoxide and nitrile groups of the initial aryne-nitrile anion adduct is proposed to account for the formation of the benzofurans. The three isomeric chloronitrobenzynes,however, do not give aryne products when treated with LDA, but rather are reduced to the corresponding bis-dichloroazoxybenzenes. (C) 1998 Elsevier Science Ltd. All rights reserved.
The reaction of 2-chloro-4-nitrophenol and the isomeric chloronitrobenzenes with LDA under aryne-forming conditions
作者:Sagun Tandel、Anlai Wang、Terra C Holdeman、Hongming Zhang、Edward R Biehl
DOI:10.1016/s0040-4020(98)00971-5
日期:1998.12
The unprecedented base-initiated generation of a nitrobenzyne and subsequent addition of preformed arylacetonitrile anion nucleophiles is reported. In all cases, 2-amino-5-nitro-3-benzo[b]furans are obtained as major product with small amounts of 3-arylmethyl-2-cyano-4-nitrophenols. A mechanism involving ring closure of phenoxide and nitrile groups of the initial aryne-nitrile anion adduct is proposed to account for the formation of the benzofurans. The three isomeric chloronitrobenzynes,however, do not give aryne products when treated with LDA, but rather are reduced to the corresponding bis-dichloroazoxybenzenes. (C) 1998 Elsevier Science Ltd. All rights reserved.