摘要:
High yields in the alkylation of dianions of alpha,beta-unsaturated carboxylic acids with secondary halides can be obtained despite elimination reactions occurring. alpha-Regioselectivity for the alkylation of but-2-enoic acids (1-4) is seldom obtained. Although double bond stereoselectivity is higher than 99% for gamma-alkylated products, stereoselectivity is rather poor for most of the alpha-alkylated products. (C) 1998 Elsevier Science Ltd. AII rights reserved.