Tautomerism-Dependent Ring Construction of <i>N</i>-Heterocyclic Compounds from the Reactions of 1-Alkynyl Fischer Carbene Complexes and Substituted Pyrazolinones
作者:Zheng、Yu、Ning Luo、Xiuwen Han
DOI:10.1021/jo061725+
日期:2006.12.1
from the reactions of 1-alkynyl Fischer carbene complexes (OC)5MC(OEt)C⋮CPh (1) (M = Cr, W) and substituted pyrazolinones (2). Reactions of 1 with 3-methyl-2-pyrazolin-5-one (2a), 3-n-propyl-2-pyrazolin-5-one (2b), 3,4-dimethyl-2-pyrazolin-5-one (2c), 3,4-trimethylene-2-pyrazolin-5-one (2d), or 3,4-tetramethylene-2-pyrazolin-5-one (2e) generated three kinds of Fischer aminocarbene complexes (3−5), and