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
从1-炔基菲舍尔卡宾配合物(OC)5 M C(OEt)C⋮CPh(1)(M = Cr,W)与取代的吡唑啉酮(2)的反应成功构建了四种类型的N-杂环系统。的反应1与3-甲基-2-吡唑啉-5-酮(2A),3- Ñ丙基-2-吡唑啉-5-酮(2B),3,4-二甲基-2-吡唑啉-5-酮(图2c),3,4-三亚甲基-2-吡唑啉-5-酮(2D),或3,4-四亚甲基-2-吡唑啉-5-酮(2E产生3种费aminocarbene复合物)(3 - 5),和的反应1与苯基取代的吡唑啉酮,即3-苯基-2-吡唑啉-5-酮(2f)及其互变异构体3-苯基-3-吡唑啉-5-酮(2 g)一起,得到Fischer烷氧基卡宾配合物(6),主要产品类型aminocarbene配合3 - 5作为次要产物。吡唑啉酮的多个互变异构现象归因于N-杂环菲舍尔卡宾配合物的多功能形成。配合物的氧化脱金属3 - 6与吡啶Ñ氧化物或中号氯过氧酸有效