首页分子通1,1,1-trifluoro-N-((trifluoromethyl)sulfonyl)methanesulfonamide compound with (S)-1-(naphthalen-1-yl)-3,3-diphenyltetrahydro-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborole (1:1)
1,1,1-trifluoro-N-((trifluoromethyl)sulfonyl)methanesulfonamide compound with (S)-1-(naphthalen-1-yl)-3,3-diphenyltetrahydro-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborole (1:1) | 1401455-90-0
1,1,1-trifluoro-N-((trifluoromethyl)sulfonyl)methanesulfonamide compound with (S)-1-(naphthalen-1-yl)-3,3-diphenyltetrahydro-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborole (1:1)
Catalytic Asymmetric Insertion of Diazoesters into Aryl-CHO Bonds: Highly Enantioselective Construction of Chiral All-Carbon Quaternary Centers
作者:Lizhu Gao、Byung Chul Kang、Do Hyun Ryu
DOI:10.1021/ja408196g
日期:2013.10.2
This paper describes a catalytic enantioselective route to synthesize functionalized all-carbonquaternary acyclic systems via a boron Lewis acid-promoted formal C-C insertion of diazoesters into aryl-CHO bonds. In the presence of chiral (S)-oxazaborolidinium cation 1d as a catalyst, the reaction proceeded in good yield (up to 83%) with good regioselectivity (up to 88:12) and excellent enantioselectivity
Chiral oxazaborolidinium ion-catalyzed asymmetric cyclopropanation of α- or α,β-substituted acroleins with α-alkyl-α-diazoesters has been developed. With this methodology, chiral functionalized cyclopropanes containing a quaternary stereogenic center were obtained with high to excellent enantioselectivities (up to >99% ee). The synthetic utility of optically enriched functionalized cyclopropane was