Access to Coumarins by Rhodium-Catalyzed Oxidative Annulation of Aryl Thiocarbamates with Internal Alkynes
作者:Yingwei Zhao、Feng Han、Lei Yang、Chungu Xia
DOI:10.1021/acs.orglett.5b00364
日期:2015.3.20
A Rh-catalyzed annulation of aryl thiocarbamates with internal alkynes via C–H bond activation has been developed. This protocol provides a new route to 3,4-disubstituted coumarins.
Smooth Conversion of 3,4-Diarylcoumarins and 3,4,5-Triaryl-2(5<i>H</i>)-furanones to 2<i>H</i>-Chromene and 2,5-Dihydrofuran Derivatives with Dimethyl Sulfide-Borane Complex
作者:Parul Verma、Sangeeta Singh、D. K. Dikshit、Suprabhat Ray
DOI:10.1055/s-1988-27468
日期:——
Reaction of 3,4-diarylcoumarins (3,4-diaryl-2-oxo-2H-1-benzopyrans) and 3,4,5-triaryl- 2(5H)-furanones with dimethyl sulfide-borane complex affords the corresponding 2H-chromenes (2H-1-benzopyrans) and 2.5-dihydrofurans in high yields. 3,4-Diaryl-2(5H)-furanones afford the corresponding furans.