Tetrahedron: Asymmetry

The synthesis of chiral 1-(1H-pyrrole) derivatives

CW Jefford, FV de Naide, K Sienkiewicz

Index: Jefford, Charles W.; De Villedon De Naide, Fabienne; Sienkiewicz, Krzysztof Tetrahedron Asymmetry, 1996 , vol. 7, # 4 p. 1069 - 1076

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Citation Number: 25

Abstract

Enantiomerically pure primary amines possessing an epimerizable center, such as α-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° 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 ...