Synthesis, structure and antimicrobial evaluation of new 3,3a,4,5-tetrahydro-2H-benzo[g]indazol-2-yl-thiazol-4(5H)-ones
作者:Deepika Gautam、R.P. Chaudhary
DOI:10.1016/j.saa.2014.06.134
日期:2015.1
The reaction of semicarbazide or thiosemicarbazide with 2-arylidene-1-tetralones under alkaline condition affords 3,3a,4,5-tetrahydro-2H-benzo[g]indazole-2-carbo(thio)amides as a mixture of cis and trans diastereoisomers of 3-H and 3a-H. The synthesis of new indazolyl-thiazol-4(5H)-ones from the condensation of cis isomer and α-halo acids is reported. A DFT study along with X-ray single crystal data
melanine biosynthesis and fruits enzymatic browning pathways. Chemical inhibitors of tyrosinase could have potential applications in cosmetics, medicine and food industry. In this study, we evaluated 6-Methoxy-3,4-dihydronaphthalenone chalcone-like derivatives as potent tyrosinase inhibitors and radical scavengers. Methods: A series of ten 2-arylidene-6-methoxy-3,4-dihydronaphthalenone derivatives as tyrosinase
Hydroxy-directed hydroaluminations: A stereoselective approach to cycloalkanols from β-aryl enones
作者:Kevin Koch、Jacqueline H. Smitrovich
DOI:10.1016/0040-4039(94)88006-9
日期:1994.2
Various aryl substituted enones are reduced using lithium aluminum hydride to afford sterioselectively trans substituted alkanols. Mechanistic studies demonstrate 1,2 addition followed by hydroxy-directedhydroalumination of the conjugated styryl unit.
Chiral Squaramide-Catalyzed Sulfa-Michael/Aldol Cascade for the Asymmetric Synthesis of Spirocyclic Tetrahydrothiophene Chromanone Derivatives
作者:Bo-Liang Zhao、Lei Liu、Da-Ming Du
DOI:10.1002/ejoc.201402889
日期:2014.12
A bifunctional squaramide-catalyzed sulfa-Michael/aldol cascadereaction between benzylidenechroman-4-ones and 1,4-dithiane-2,5-diol with a low catalyst loading has been developed. This reaction constitutes a facile asymmetricsynthesis of chiral spirocyclic tetrahydrothiophene chromanone derivatives with three contiguous stereocenters in high to excellent yields (up to 99 %) and with high enantioselectivities