α-Oxoketene Dithioacetals Mediated Benzoannelation of Aromatic Heterocycles: an Efficient Regiocontrolled Synthesis of Highly Substituted and Polycyclic Benzo[b]thiophenes
作者:J.R. Suresh、Okram Barun、H. Ila、H. Junjappa
DOI:10.1016/s0040-4020(00)00722-5
日期:2000.10
An efficient regiocontrolled synthesis of highly substituted and complex polycyclic benzo[b]thiophenes has been developed via our benzoannelation strategy involving conjugate addition–displacement on a variety of α-oxoketenedithioacetals by carbanions derived from 2- and 3-cyanomethylthiophenes followed by acid induced cyclization of the resulting conjugate adducts.
通过我们的苯甲酰化策略,开发了一种高效的区域控制的合成方法,该方法可控制区域取代基和复杂的多环苯并[ b ]噻吩,包括通过2-和3-氰基甲基噻吩的碳负离子在各种α-氧杂环丁烯二硫缩醛上进行共轭加成-置换,然后进行酸诱导的环化反应生成的共轭加合物。
An Expedient New Synthesis of Substituted Carbazoles via α-Oxoketene Acetals through Heteroaromatic Annelation Methodology
A Novel Route to 2-Alkoxy / Aryloxythiophenes via Simmons-Smith Reaction on Acylketene<i>O,S</i>-Acetals
作者:Laxminarayan Bhat、H. Ila、H. Junjappa
DOI:10.1055/s-1993-25978
日期:——
A novel route to 2-alkoxy/aryloxy-4-arylthiophenes 4a-k and the corresponding 3,4-annulated thiophene 7 has been developed by subjecting the respective acylketene O,S-acetals 1a-k and 6 to Simmons-Smith reaction conditions (zinc-copper/diiodomethane).
Highly efficient and selective displacement of alkylthio group on acylketene O,S-acetals by organocopper reagents: A novel route to 2-alkoxy/aryloxy-1-alkenylketones
作者:Barun K. Mehta、Sanchita Dhar、H. Ila、H. Junjappa
DOI:10.1016/0040-4039(95)01990-y
日期:1995.12
Acylketene O,S-acetals 1a-k undergo efficient and selective conjugate displacement of alkylthio group with organocopper(l) reagents to afford the corresponding 6-alkoxy/aryloxy enones 2-21 in good yields.
A new general regiocontrolled synthesis of highly substituted and condensed indoles via heteroaromatic annelation
作者:J.R. Suresh、Pranab K. Patra、H. Ila、H. Junjappa
DOI:10.1016/s0040-4020(97)00985-x
日期:1997.10
A new general method for the synthesis of substituted and condensed indoles has been developed via heteroaromatic annelation involving base induced conjugate addition-elimination of 1-methylpyrrole-2-acetonitrile to various α-oxoketene acetals followed by cyclization of the resulting adducts in the presence of TsOH in refluxing benzene.