Single-Pot Preparation of 4-Amino-2-(het)aryl-5-Substituted Thiazoles Employing Functionalized Dithioesters as Thiocarbonyl Precursors
作者:Anusha Avadhani、Pethaperumal Iniyavan、Yogendra Kumar、Hiriyakkanavar Ila
DOI:10.1021/acs.joc.1c00616
日期:2021.6.18
4-amino-2-(het)aryl/alkyl-5-functionalized thiazoles has been disclosed, utilizing aryl/heteroaryl/alkyl dithioesters as thiocarbonyl coupling partners in a modified Thorpe–Ziegler type cyclization. The reaction proceeds at room temperature, under mild conditions, in excellent yields, displaying broad functional group compatibility at 2 and 5 positions of thiazoles. This synthetic strategy has been further
Sequential One-Pot Synthesis of Tri- and Tetrasubstituted Thiophenes and Fluorescent Push–Pull Thiophene Acrylates Involving (Het)aryl Dithioesters as Thiocarbonyl Precursors
作者:Anand Acharya、G. Parameshwarappa、B. Saraiah、H. Ila
DOI:10.1021/jo502429c
日期:2015.1.2
An efficient, one-pot three component synthesis of highly functionalized tri- and tetrasubstituted thiophenes has been reported involving (het)aryl dithioesters as thiocarbonyl precursors. Thus, sequential base mediated condensation of readily available (het)aryl active methylene ketones with (het)aryl dithioesters followed by S-alkylation of the resulting enethiolate salts with activated halomethylene
Synthesis of Substituted Benzo[<i>b</i>]thiophenes via Base-Promoted Domino Condensation–Intramolecular C–S Bond Formation
作者:Yogendra Kumar、Hiriyakkanavar Ila
DOI:10.1021/acs.orglett.1c00085
日期:2021.3.5
A novel synthesis of 2,3-substituted benzothiophenes is reported, involving a tandem base-mediated condensation of o-iodoarylacetonitriles/acetates/ketones with (hetero)aryldithioesters and an intramolecular C–S bond formation. The reaction affords diversely substituted benzothiophenes and heterofused thiophenes in excellent yields.
One-Pot Synthesis of Functionalized Benzo[<i>b</i>]thiophenes and Their Hetero-Fused Analogues via Intramolecular Copper-Catalyzed S-Arylation of In Situ Generated Enethiolates
作者:Anand Acharya、S. Vijay Kumar、B. Saraiah、H. Ila
DOI:10.1021/acs.joc.5b00032
日期:2015.3.6
An efficient one-pot synthesis of highly functionalized multisubstituted benzo[b]thiophenes and their hetero-fused analogues, such as thieno[2,3-b]thiophenes, indolo[2,3-b]thiophenes, and pyrazolo[3,2-c]thiophenes, has been reported. The overall strategy involves sequential base-mediated condensation of 2-bromohet(aryl)acetonitrile precursors with (het)aryl/alkyl dithioesters or other thiocarbonyl
高效一锅合成高官能度的多取代苯并[ b ]噻吩及其杂合类似物,如噻吩并[2,3- b ]噻吩,吲哚并[2,3- b ]噻吩和吡唑并[3,2] - ç ]噻吩,已有报道。总体策略涉及2-溴己基(芳基)乙腈前体与(杂)芳基/烷基二硫代酯或其他硫代羰基化合物如三硫代碳酸二甲酯,S-甲基黄原酸酯,N-咪唑基二硫代甲基酯,N-烷基二硫代氨基甲酸酯和苯基异硫氰酸酯,然后分子内铜催化的原位生成的烯硫醇酯的芳硫基化,以高收率提供了各种2-官能化的3-氰基苯并[ b ]-和/或杂稠噻吩。
Diversity-Oriented Synthesis of Substituted Benzo[<i>b</i>]thiophenes and Their Hetero-Fused Analogues through Palladium-Catalyzed Oxidative CH Functionalization/Intramolecular Arylthiolation
作者:Anand Acharya、S. Vijay Kumar、Hiriyakkanavar Ila
DOI:10.1002/chem.201501828
日期:2015.11.16
benzo[b]thiophenes has been developed throughpalladium‐catalyzed intramolecular oxidative CH functionalization–arylthiolation of enethiolate salts of α‐aryl‐β‐(het)aryl/alkyl‐β‐mercaptoacrylonitriles/acrylates or acrylophenones. The overall strategy involves a one‐pot, two‐step process in which enethiolate salts [generated in situ through base‐mediated condensation of substituted arylacetonitriles, deoxybenzoins