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
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.
5-diarylthiazoles. An efficient synthesis of 4,5-disubstituted thiazoles via base-induced cyclization of active methylene isocyanides such as tosylmethyl isocyanide, ethyl isocyanoacetate, and arylmethyl isocyanides with methyl arene- and hetarenecarbodithioates is reported. This synthesis could be a new click chemistry reaction, since it is simple, rapid, and often avoids purification steps. In addition
Ligand- and catalyst-free intramolecular C-S bond formation: direct access to indalothiochromen- 4-ones
作者:T.A. Jenifer Vijay、Nagarakere C. Sandhya、C.S. Pavankumar、Kanchugarakoppal S. Rangappa、Kempegowda Mantelingu
DOI:10.1515/hc-2014-0206
日期:2015.6.1
Abstract
An efficient ligand- and catalyst-free intramolecular S-arylation leading to the direct synthesis of indalothiochromen-4-ones from simple dithioesters under mild conditions has been developed. This method is particularly noteworthy given its experimental simplicity, high generality, and good functional group toleration.