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 2-Phenyl-4,5-Substituted Oxazoles by Copper-Catalyzed Intramolecular Cyclization of Functionalized Enamides
作者:S. Vijay Kumar、B. Saraiah、N. C. Misra、H. Ila
DOI:10.1021/jo3021192
日期:2012.12.7
An efficient two-step synthesis of 2-phenyl-4,5-substituted oxazoles involving intramolecularcopper-catalyzed cyclization of highly functionalized novel β-(methylthio)enamides as the key step has been reported. These enamides are obtained by nucleophilic ring-opening of newly synthesized 4-[(methylthio)hetero(aryl)methylene]-2-phenyl-5-oxazolone precursors by alkoxides, amines, amino acid esters and
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.
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
A metal-free, one-pot route to substituted benzo[b]thiophenes and their hetero-fused analogs via iodine mediated intramolecular arylthiolation of in situ generated β-(het)aryl-β-cyanoenethiolates
作者:Saraiah Bonagiri、Anand Acharya、Mohamed A. Pasha、Ila Hiriyakkanavar
DOI:10.1016/j.tetlet.2017.10.028
日期:2017.12
2-(het)aryl-2-cyanoenethiolates generated in situ by base mediated condensation of arylacetonitriles and (het)aryl dithioesters. The methodology has been further extended to the synthesis of 2-aminobenzo[b]thiophenes as well as hetero-fused thiophenes such as thieno[2,3-b]thiophenes, thieno[2,3-b]indoles and thieno[3,2-c]pyrazoles. An electrophilic cyclization mechanism has been proposed based on experimental
通过碘介导的由芳基乙腈和(杂)芳基的碱介导的原位生成的2-(杂)芳基-2-氰基硫醇盐的碘介导的分子内芳基硫醇化反应,已开发出了一种无金属的一锅法生成取代的3-氰基苯并[ b ]噻吩的方法。二硫酯。该方法已进一步扩展到2-氨基苯并[ b ]噻吩以及杂稠稠合噻吩的合成,如噻吩并[2,3- b ]噻吩,噻吩并[2,3- b ]吲哚和噻吩并[3, 2- c ]吡唑。已经基于实验观察结果提出了亲电环化机理。