A new synthesis of alkyl 1-alkyl-2-methylpyrrole-3-carboxylates by ring transformation of 2-chloro-2-acetimidoylbutyrolactones
摘要:
Reaction of 2-chloro-2-acetimidoylbutyrolactones with sodium methoxide or sodium ethoxide in the corresponding alcohol provides a facile one-step synthesis of methyl or ethyl 1-alkyl-2-methylpyrrole-3-carboxylates from readily available starting materials. (C) 1999 Elsevier Science Ltd. All rights reserved.
A novel and efficient methodology for the synthesis of 1,2,3-trisubstituted pyrroles by one-pot two-step reaction has been developed. The iodocyclization of a series of β-enamino esters followed by dehydroiodination, led to the formation of corresponding pyrroles. This approach provides an easy access to a wide range of 1,2,3-trisubstituted pyrroles.
A Two Step Synthesis of 1,2,3-Substituted Pyrroles
作者:Anna C. Cunha、Leticia O.R. Pereira、Rodrigo O. P. de Souza、Maria Cecilia B. V. de Souza、Vitor F. Ferreira
DOI:10.1080/00397910008086932
日期:2000.9
A method for preparing substituted pyrroles 3a-g in two steps from dihydrofurans 2a-b which were synthesized from alpha,alpha'-diazocarbonyl derivatives 1a-b was developed. The relevance of this research work lies in the easiness of preparing the substituted dihydrofurans and transforming them into pyrroles under mild conditions.