The Journal of organic chemistry

Tautomerism-dependent ring construction of N-heterocyclic compounds from the reactions of 1-alkynyl Fischer carbene complexes and substituted pyrazolinones

Z Zheng, Z Yu, N Luo, X Han

Index: Zheng, Zhaoyan; Yu, Zhengkun; Luo, Ning; Han, Xiuwen Journal of Organic Chemistry, 2006 , vol. 71, # 26 p. 9695 - 9700

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Citation Number: 14

Abstract

Four types of N-heterocyclic ring systems were successfully constructed from the reactions of 1-alkynyl Fischer carbene complexes (OC) 5M C (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 ...