Cyclocondensation of α-OxoketeneN,S-Acetals with β-Lithioamino-β-Substituted Acrylonitriles: A Facile Route to 2,6-Substituted 4-Amino-3-cyanopyridines
Cycloaromatization of Methyl (E)-4-(Methyllithio)-3-(1-pyrrolidinyl)-2-butenoate with α-Oxoketene N,S-Acetals: Direct Synthesis of 3,5-Bis(cycloalkylamino)biphenyls
作者:Kethiri R. Reddy、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1055/s-1995-4029
日期:1995.8
The vinyl carbanion 2 undergoes cycloaromatization with α-oxoketene N,S-acetals 3 through 1,4-conjugate addition-elimination process to afford 3,5-diaminobiphenyls 4 in good yields.
Highly Regioselective Synthesis of 1-Aryl-3 (or 5)-alkyl/aryl-5 (or 3)-(<i>N</i>-cycloamino)pyrazoles
作者:S. Peruncheralathan、A. K. Yadav、H. Ila、H. Junjappa
DOI:10.1021/jo051478u
日期:2005.11.1
An efficient highlyregioselective protocol for the synthesis of isomeric 1,3-diaryl (or 1-aryl-3-alkyl) and 1,5-diaryl (or 1-aryl-5-alkyl)-5 (or 3)-(N-cycloamino)pyrazoles has been reported by cyclocondensation of common α-oxoketene N,S-acetal precursors with arylhydrazines by variation of reaction conditions.