A new facile method for the stereoselective synthesis of trans-2-aryl-3,3-dimethylcyclopropane-1-carboxylic acids
作者:Bang-Chi Chen、Khehyong Ngu、Peng Guo、Wen Liu、Joseph E Sundeen、David S Weinstein、Karnail S Atwal、Saleem Ahmad
DOI:10.1016/s0040-4039(01)01224-2
日期:2001.9
A new facile method for the preparation of trans-2-aryl-3,3-dimethylcyclopropane-1-carboxylic acids was developed. The new method involved [2+2]-cycloaddition of styrenes with NN,2-trimethylpropionamide followed by bromination and rearrangement of the resulting 3-aryl-2,2-dimethylcyclobutanones, affording the title compounds in two steps in 60-84% overall yields. (C) 2001 Elsevier Science Ltd. All rights reserved.