1,2-Aryl and 1,2-Hydride Migration in Transition Metal Complex Catalyzed Diazo Decomposition: A Novel Approach to α-Aryl-β-enamino Esters
作者:Nan Jiang、Zhaohui Qu、Jianbo Wang
DOI:10.1021/ol016324p
日期:2001.9.1
esters in good yields and high stereoselectivity. The effect of the catalysts on the migratory aptitude of 1,2-aryl over 1,2-hydride migration was studied. A reaction mechanism involving a "bridged" phenoniumion is proposed. Reaction: see text.
Johnson–Corey–Chaykovsky trifluoroethylidenation with (2,2,2-trifluoroethyl)diphenylsulfonium triflate proceeded smoothly to afford trifluoromethyl-epoxides, -cyclopropanes and -aziridines with excellent diastereoselectivity.
An Efficient Approach to α-Aryl β-Amino Esters through 1,2-Aryl Migration of p-Toluenesulfonic Acid Mediated Diazo Decomposition
作者:Nan Jiang、Jianbo Wang
DOI:10.1055/s-2002-19354
日期:——
A new method for the synthesis of α-aryl β-amino esters has been developed. The key step in this preparation is the chemoselective 1,2-aryl migration of diazo carbonyl compounds catalyzed by TsOH.
An efficient synthesis of α-aryl β-(N-tosyl)amino phosphonate derivatives from α-diazophosphonate
作者:Yonghua Zhao、Nan Jiang、Jianbo Wang
DOI:10.1016/j.tetlet.2003.08.124
日期:2003.11
The α-diazophosphonate was added to aryl (N-tosyl)imine to give β-aryl β-(N-tosyl)amino α-diazophosphonates, which were further subjected to TsOH-catalyzed diazo decomposition to yield α-aryl β-(N-tosyl)enaminophosphonates through 1,2 aryl migration. The α-aryl β-(N-tosyl)enamino phosphonates were hydrogenated to give α-aryl β-(N-tosyl)amino phosphonates.
cyclopropenes to imines by leveraging the synergy between photoredox and asymmetric cobalt catalysis. This protocol facilitated the synthesis of a series of chiral functionalized cyclopropanes with high yield, enantioselectivity, and diastereoselectivity (44 examples, up to 93% yield and >99% ee). A possible reaction mechanism involving cyclopropene desymmetrization by Co–H species and imine addition by