Novel and convenient routes to substituted pyrroles and imidazoles
作者:Alan R. Katritzky、Lie Zhu、Hengyuan Lang、Olga Denisko、Zuoquan Wang
DOI:10.1016/0040-4020(95)00851-x
日期:1995.11
pyrroles. Lithiaiion of 6 followed by reactions with imines gives cyclized 4,5-dihydroimidazoles 14 which upon further treatment with ZnBr2 or direct refluxing in toluene yield the 1,25-trisubstituted imidazoles 15 in good yields.
An iodoxybenzoic acid-mediated selected oxidative cyclization of N-hydroxyalkyl enamines was developed. Through this strategy, a variety of 2,3-disubstituted pyrroles and pyridines were produced in good selectivity involving oxidation of alcohol, followed by condensation of aldehyde and α-C of enamines. Furthermore, this metal-free method has several advantages, including the use of environmentally