The reaction of nitrones with pyrroles and furan: an easy access to heteroaromatic hydroxylamines and bis(heteroaryl)alkanes
摘要:
N-Benzylnitrones react with heteroaromatic compounds such as pyrroles or furan in the presence of hydrogen chloride. Either heteroaromatic N-benzylhydroxylamines, symmetrical or unsymmetrical 2,2'-bis(heteroaryl)alkanes could be selectively produced depending on the experimental conditions. (c) 2005 Elsevier Ltd. All rights reserved.
A new strategy for the preparation of unsymmetrical 2,2′-bis(pyrrolyl)alkanes has been developed. It involved the condensation of pyrrole derivatives onto N-benzylhydroxylamines in the presence of HCl. This two-step procedure provided access to a wide variety of 2,2′-dipyrromethanes (3a–m). It has also been extended to the synthesis of tripyrromethanes 4a–d and of N-confused dipyrromethanes 6a–d.
N-Benzylnitrones react with heteroaromatic compounds such as pyrroles or furan in the presence of hydrogen chloride. Either heteroaromatic N-benzylhydroxylamines, symmetrical or unsymmetrical 2,2'-bis(heteroaryl)alkanes could be selectively produced depending on the experimental conditions. (c) 2005 Elsevier Ltd. All rights reserved.