Chemoselective Reduction of Isatin-Derived Electron-Deficient Alkenes Using Alkylphosphanes as Reduction Reagents
作者:Shu-Hua Cao、Xiu-Chun Zhang、Yin Wei、Min Shi
DOI:10.1002/ejoc.201100017
日期:2011.5
Under mild reaction conditions, the C=C double bond in isatin-derivedelectron-deficientalkenes has been exclusively reduced in the presence of alkylphosphanes and water to afford the corresponding reduction products in good to excellent yields. A plausible mechanism is proposed on the basis of deuterium-labeling experiments.
Enantioselective direct Mannich reactions of 3-substituted oxindoles catalyzed by chiral phosphine via dual-reagent catalysis
作者:Qiaowen Jin、Changwu Zheng、Gang Zhao、Gang Zou
DOI:10.1016/j.tet.2018.06.030
日期:2018.7
combination of an amino acid-derived chiral phosphine catalyst and methyl acrylate to catalyze the direct Mannich reaction of 3-substituted oxindoles and imines has been reported to afford 3-tetrasubstituted oxindole derivatives which are key structures for biological activities. The products are formed with a quaternarycarbon and featured with two adjacent chiral centers. Various N-EDG(electron-donating