Facile and efficient synthesis of 4'-thioxo-1',3,3',4,4',6' -hexahydro-1H,2'H-spiro[naphthalene-2,5'-pyrimidin]-1-ones in a three-component Mannich-type reaction
作者:Tadeusz Stefan Jagodziński、Sławomir Westerlich
DOI:10.3998/ark.5550190.p007.912
日期:——
Spirohexahydropyrimidines were obtained in the one-pot three-componentreaction of the tetralone-derived thioamides, amines and formaldehyde with alcoholic hydrogen chloride as the catalyst.
Enantioselective Synthesis of Ring-Fused Spiroannulated 1,2,3-Thiadiazole Derivatives
作者:Xue-Mei Zeng、Jian-Wu Xie
DOI:10.1021/acs.joc.6b00127
日期:2016.5.6
An organocatalytic enantioselective domino α-amination/oxidative coupling/cyclization of thioamides to azodicarboxylates catalyzed by an easily available organic catalyst has been developed. The key step, oxidative coupling, is smoothly fulfilled in air. Optically active spiroannulated 1,2,3-thiadiazole derivatives are obtained with high yields and enantioselectivities for the first time.
Access to thiazoline and spiro[indoline-3,3′-thiophene] scaffolds <i>via</i> a formal [3 + 2] annulation reaction of crotonate-derived sulfur ylides and β-ketothioamides
作者:Jing Zheng、Hong Gu、Qinfang Chen、Weiran Yang
DOI:10.1039/d3ob00087g
日期:——
sulfur ylides and β-ketothioamides (KTAs) was successfully developed to produce good-to-excellent yields of thiazoline and spiro[indoline-3,3′-thiophene] scaffolds. This transformation is a powerful tool for the synthesis of thiazoline and spiro[indoline-3,3′-thiophene] scaffolds due to its mild reaction conditions, easily accessible starting materials, and broad substrate scope. A large-scale reaction was
Simultaneous diversity-oriented synthesis of benzothiazoles and related diverse analogues by iodine-catalyzed intramolecular cyclization from identical substrates
A facile oxidative cyclization of β-ketothioamides for the simultaneous formation of a compound library similar to natural product benzothiazole derivatives has been developed. The oxidative cyclization of β-ketothioamides resulted in the simultaneous formation of four classes of previously unknown benzothiazole derivatives. This chemistry’s versatility adds a valuable component to the methodology
An N-heterocyclic carbene-catalyzed asymmetric [3 + 3] spiroannulation of beta-ketothioamide was successfully developed. beta-Ketothioamides exhibit an unusual reactivity to undergo a previously challenging lactamization reaction, and the desired spiro-piperidinone derivatives containing two vicinal stereogenic centers were synthesized in good to high yields with high stereoselectivities, whose structure can be converted to the corresponding imide and delta-lactam derivatives smoothly.