A catalytic, mild and efficient protocol for the C-3 aerial hydroxylation of oxindoles
摘要:
A mild, high yielding approach to C-3 hydroxylated oxindoles using catalytic quantities of tetrabutylammonium fluoride and air as the stoicheiometric oxidant is reported over a wide range of substitution patterns. (C) 2012 Elsevier Ltd. All rights reserved.
Asymmetric hydroxyamination of oxindoles catalyzed by chiral bifunctional tertiary aminethiourea: construction of 3-amino-2-oxindoles with quaternary stereocenters
作者:Li-Na Jia、Jun Huang、Lin Peng、Liang-Liang Wang、Jian-Fei Bai、Fang Tian、Guang-Yun He、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1039/c1ob06413d
日期:——
Chiral bifunctional tertiary amine thiourea was applied to catalyze the asymmetric hydroxyamination of 3-subsituted oxindoles with nitrosobenzene to construct 3-amino-2-oxindoles with quaternary stereocenters in good yields (up to 91%) and enantioselectivities (up to 90% ee).
guanidine-catalyzed Michael addition of 3-benzyl substituted oxindoles to N-maleimides has been developed to produce oxindolederivatives with a quaternary carbon chiral center at the 3-position in excellent yields and enantio- and diastereoselectivities. This is the first incorporation of N-benzylic alpha-branched succinimides into 3,3-disubstituted oxindoles.
Expanding the Scope of Cinchona Alkaloid-Catalyzed Enantioselective α-Aminations of Oxindoles: A Versatile Approach to Optically Active 3-Amino-2-oxindole Derivatives
作者:Tommy Bui、Mar Borregan、Carlos F. Barbas
DOI:10.1021/jo902039a
日期:2009.12.4
A cinchona alkaloid-catalyzed, highly enantioselective, α-amination of oxindoles has been developed. The reaction is general, operationally simple, and affords the desired products in high yields with good to excellent enantioselectivity. Significantly, this study provides a general catalytic method for the construction of a C−N bond at the C3 position of oxindoles as well as for the creation of a