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.
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.
N-Substituted 3-(arylamino)-4,5-dihydro-2H-benz[g]indazol-2-yl acetamides with anti-inflammatory and analgesic activities
A series of substituted 3-(arylamino)-4,5-dihydro-2H-benz[g]indazol-2-yl acetamides was synthesized and tested in comparison with former analogues. The title compounds showed only weak antiarrhythmic properties but good anti-inflammatory and antinociceptive activity, particularly evident in the morpholino derivative. (C) 2000 Published by Elsevier Science S.A. All rights reserved.
Synthesis of functionalized pyridines and thiophenes by Michael addition of some ?-keto carbothioic acid anilides to electrophilic olefins