Regiospecific generation and application of 3-lithiomethyl-2-methyl-1-phenylpyrazolin-5-one as 1,3-binucleophile in aromatic annelation: A novel approach for synthesis of 1,2-disubstituted indazolones and their condensed analogs
作者:Kethiri R. Reddy、Amrita Roy、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1016/0040-4020(95)00650-w
日期:1995.10
The enolate anion 5A generated by deprotonation of 2,3-dimelhyl- 1-phenylpyrazolin-5-one is shown to undergo highly regioselective γ-1,4-addition to α-oxoketene dithioacelals followed by cycloaromatizalion in the presence of boron trifluoride etherate to afford wide range of novel substituted and condensed indazolones in good yields.
Balu; Bhat; Ila, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1991, vol. 30, # 2, p. 250 - 255
作者:Balu、Bhat、Ila、Junjappa
DOI:——
日期:——
Direct Synthesis of 2-(Cycloalkylamino)-3,4-Substituted Thiophenes via Selective Deprotonation-Cyclization of Aroyl Ketene N,S-Acetals
作者:Kethiri R. Reddy、Mandava V. Basaveswara Rao、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1080/00397919608004653
日期:1996.11
Acyclic and cyclic aroyl ketene N,S-acetals undergo regioselective deprotonation-cyclization viadipolestabilizedcarbanion in the presence of LDA/THF to afford the corresponding 2-(cycloalkylamino)-4-aryl or 3,4-annelated thiophenes in moderate to good yields.