作者:Charles W. Jefford、Fabienne de Villedon de Naide、Krzysztof Sienkiewicz
DOI:10.1016/0957-4166(96)00111-5
日期:1996.4
Enantiomerically pure primary amines possessing an epimerizable center, such as alpha-amino acids and their ester hydrochlorides, undergo condensation with tetrahydro-2,5-dimethoxyfuran 2 in acetic acid or acetic acid containing sodium acetate at 80 degrees C for 30 min. to give the corresponding 1-(1H-pyrrolyl) derivatives with partial racemization (9-18%). By replacing the solvent with a stirred mixture of aqueous acetic acid and 1,2-dichloroethane in the case of the acids and with water-1,2-dichloroethane for the ester hydrochlorides, repetition of the previous experiment gives the corresponding pyrroles in high yield and with complete retention of configuration, beta-Aminoalcohols are also efficiently converted to their 1-(1H-pyrrolyl) derivatives in a stirred, warm mixture of aqueous acetic acid and 1,2-dichloroethane. Copyright (C) 1996 Elsevier Science Ltd