A Novel Anionic Domino Process for the Synthesis of o-Cyanoaryl-Methylthio/Alkyl/Aryl/Heteroaryl Acetylenes
摘要:
A novel unexpected anionic domino process involving n-BuLi-induced rearrangement of 3,3-bis(methylthio) or 3-methylthio-3-aryl/heteroaryl/alkyl-o-bromoarylacrylonitriles to o-cyanoarylacetylenes in synthetically useful yields has been reported. The scope and generality of the reaction has been examined, and a possible mechanism has been proposed.
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 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
Facile coupling of 2-(1-ethylthioethenyl)pyrroles with amines: A route to 2-(1-aminoethenyl)pyrroles and 1-amino-3-iminopyrrolizines
作者:Boris A. Trofimov、Lyubov' N. Sobenina、Al'bina I. Mikhaleva、Ol'Ga V. Petrova、Vladislav N. Drichkov、Igor A. Ushakov、Ol'Ga A. Tarasova、Darya-Suren D. Toryashinova、Yuriy Yu. Rusakov、Leonid B. Krivdin
DOI:10.1002/jhet.5570440301
日期:2007.5
2-(2-Cyano-1-ethylthioethenyl)pyrroles are readily coupled (50–55°) with primary and secondary amines at the position 1 of the ethenyl moiety to eliminate ethanethiol and afford 2-(1-amino-2-cyanoethenyl)pyrroles and/or their cyclic isomers - functionalized 1-amino-3-iminopyrrolizines in good to high yields.
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.