Unexpected Reactivity of o-Nitrosophenol with RCH2Br: C−H Bond Cleavage and Annulation to Benzoxazoles and Benzoxazines (R = Alkynyl)
摘要:
A one-pot reaction between two molecules of 5-diethylamino-2-nitrosophenol with one molecule of 2-butynyl bromide gave rise to a new heterocyclic compound (structure shown above) consisting of one benzoxazole and one benzoxazine ring. The reaction works equally well with 1-phenyl-3-chloro-l-propyne. It was also found that 5-diethylamino-2-nitrosophenol reacts with R-CH2Br (R = aryl or vinyl) to give benzoxazoles with good functional group tolerance and high yield.
Unexpected Reactivity of <i>o</i>-Nitrosophenol with RCH<sub>2</sub>Br: C−H Bond Cleavage and Annulation to Benzoxazoles and Benzoxazines (R = Alkynyl)
作者:Wei Yao、Dejian Huang
DOI:10.1021/ol902812q
日期:2010.2.19
A one-pot reaction between two molecules of 5-diethylamino-2-nitrosophenol with one molecule of 2-butynyl bromide gave rise to a new heterocyclic compound (structure shown above) consisting of one benzoxazole and one benzoxazine ring. The reaction works equally well with 1-phenyl-3-chloro-l-propyne. It was also found that 5-diethylamino-2-nitrosophenol reacts with R-CH2Br (R = aryl or vinyl) to give benzoxazoles with good functional group tolerance and high yield.