Enantioselective construction of novel chiral spirooxindoles incorporating a thiazole nucleus
作者:L.-Y. Cui、Y.-M. Wang、Z.-H. Zhou
DOI:10.1039/c6ra14178a
日期:——
Asymmetric cascade Michael/cyclization reaction between 2-substituted thiazol-4-ones and 2-(2-oxoindolin-3-ylidene)malononitriles was investigated using a series of chiralbifunctional hydrogen-bonding organocatalysts. Good yields (up to 91%) and excellent enantioselectivities (up to 98% ee) were achieved by using a (1R,2R)-1,2-diphenylethane-1,2-diamine derived thiourea catalyst. This method provides an
An Efficient Construction of CF
<sub>3</sub>
‐Substituted Spirooxindole‐Fused Benzo[a]quinolizidines by a Three‐Component Cyclization
作者:Yijie Hu、Liufeiyang Ye、Jie Chen、Hui Zhang、Hongmei Deng、Jin‐Hong Lin、Weiguo Cao
DOI:10.1002/ejoc.202100809
日期:2021.8.13
Since benzo[a]quinolizidine is a key subunit in numerous natural products and pharmaceuticals, its synthesis has received attention. Described herein is a convenient three-component cyclization for the efficient construction of CF 3 -substituted spirooxindole-fused benzo[a]quinolizidines by using CF3 -propiolate as a building block. This attractive protocol may find great synthetic utility as CF 3
作者:Xiao-Yan Zhang、Ze Shen、Li-Li Hu、Liang-Jun Wang、You-Shuai Lin、Jian-Wu Xie、Hai-Lei Cui
DOI:10.1016/j.tetlet.2016.07.035
日期:2016.8
A microwave-assisted and phosphine-mediated Tomita Zipper cyclization of dicyanomethylideneoxindoles and ynones has been developed. Various functionalized spirooxindoles with five-membered carbocyclic ring can be obtained in moderate to good yields with moderate to excellent diastereoselectivities through in situ generation of alpha-nucleophile (up to 87% yield, >20:1 dr). (C) 2016 Elsevier Ltd. All rights reserved.