Rhodium-Catalyzed Asymmetric Formal Cycloadditions of Racemic Butadiene Monoxide with Imines
作者:Zhaoqun Liu、Xiangqing Feng、Haifeng Du
DOI:10.1021/ol301248d
日期:2012.6.15
sulfur−alkene hybrid ligand has proven to be highly effective for rhodium-catalyzed formal cycloaddition reactions of racemic butadiene monoxide and imines to furnish spirooxindole oxazolidines or 1,3-oxazolidines with high yields and stereoselectivities. A possible dynamickineticresolution as well as a kineticresolution is considered to be involved in this catalytic process.
An efficient and stereoselective reaction between 3-isothiocyanato oxindoles and isatins/isatinimines has been developed to afford structurally diverse dispiro[oxazolidine-2-thione]bisoxindoles and dispiro[imidazolidine-2-thione]bisoxindoles in excellent results under mild conditions. The potential of asymmetric induction by means of a chiral auxiliary was explored. The isomers are separable, and products could be isolated as single diastereomers by column chromatography. Further synthetic transformations of the reaction product were also successfully realized.
Varma; Gupta, Journal of the Indian Chemical Society, 1989, vol. 66, # 5, p. 349 - 350
作者:Varma、Gupta
DOI:——
日期:——
VARMA, R. S.;GUPTA, PREETI, J. INDIAN CHEM. SOC., 66,(1989) N, C. 349-350
作者:VARMA, R. S.、GUPTA, PREETI
DOI:——
日期:——
Imidazolylpyridine-In(OTf)<sub>3</sub> catalyzed enantioselective allylation of ketimines derived from isatins
作者:Tingting Chen、Chun Cai
DOI:10.1039/c6ob00551a
日期:——
An enantioselective In(OTf)3-catalyzed allylation of ketimines derived from isatins in the presence of an imidazolylpyridine ligand is described. The reaction proceeded smoothly under mild conditions and resulted in 3-allyl 3-aminooxindoles with good yields and moderate to excellent enantioselectivities (up to 97% ee).