Synthesis of hydrogenated indazole derivatives starting with α,β-unsaturated ketones and hydrazine derivatives
摘要:
The reaction of hydrazine derivatives with alpha,beta-unsaturated ketones, such as cyclohexenyl(phenyl) methanone and (E)-2-benzylidenecyclohexanone, were investigated.The reaction between methylhydrazine and e.g., cyclohexenyl(phenyl)methanone was particularly interesting as 3a,4,5,6,7,7a-hexahydro-1-methyl-3-phenyl-1H-indazole was obtained as the major product together with 4,5,6,7-tetrahydro-2-methyl-3-phenyl-2H-indazole as a minor product. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of hydrogenated indazole derivatives starting with α,β-unsaturated ketones and hydrazine derivatives
摘要:
The reaction of hydrazine derivatives with alpha,beta-unsaturated ketones, such as cyclohexenyl(phenyl) methanone and (E)-2-benzylidenecyclohexanone, were investigated.The reaction between methylhydrazine and e.g., cyclohexenyl(phenyl)methanone was particularly interesting as 3a,4,5,6,7,7a-hexahydro-1-methyl-3-phenyl-1H-indazole was obtained as the major product together with 4,5,6,7-tetrahydro-2-methyl-3-phenyl-2H-indazole as a minor product. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of Bicyclic<i>N</i>-Methylpyrazoline and Pyrazole Derivatives from α,β-Unsaturated Ketones and<i>N</i>,<i>N</i>-Dimethylhydrazine: An Illustration of Reductive Cyclization
作者:A. K. Panda、U. Das、J. W. Quail、J. R. Dimmock
DOI:10.1002/jhet.1570
日期:2014.1
The reaction of N,N‐dimethylhydrazine with α,β‐unsaturated keto precursors such as 2‐benzylidenecyclohexanone, 2,6‐bis(benzylidene)cyclohexanone, and 3,5‐bis(benzylidene)‐1‐methyl‐4‐piperidone hydrochloride provided bicyclic N‐methylpyrazoles instead of hydrazones or any Michael addition products. The crystal structure of a representative pyrazole is reported. The proposed mechanism for the formation
Synthesis of hydrogenated indazole derivatives starting with α,β-unsaturated ketones and hydrazine derivatives
作者:Azadeh Nakhai、Jan Bergman
DOI:10.1016/j.tet.2009.01.041
日期:2009.3
The reaction of hydrazine derivatives with alpha,beta-unsaturated ketones, such as cyclohexenyl(phenyl) methanone and (E)-2-benzylidenecyclohexanone, were investigated.The reaction between methylhydrazine and e.g., cyclohexenyl(phenyl)methanone was particularly interesting as 3a,4,5,6,7,7a-hexahydro-1-methyl-3-phenyl-1H-indazole was obtained as the major product together with 4,5,6,7-tetrahydro-2-methyl-3-phenyl-2H-indazole as a minor product. (C) 2009 Elsevier Ltd. All rights reserved.