Triphenylphosphine-Catalyzed [3+2] Cycloaddition of Allenoate and Active Olefins: Syntheses of Spirooxindole Derivatives
作者:Xueshun Jia、Shanyan Guo、Rendong Wang、Jian Li、Chunju Li、Hongmei Deng
DOI:10.1055/s-0030-1261188
日期:2011.9
A series of spiro compounds was achieved by triphenylphosphine-catalyzed [3+2] cycloaddition between active methylenemalononitrile and ethyl 2,3-butadienoate. Careful investigation showed that the present method had high regioselectivity. The products have a spirooxindole skeleton, which is a motif common in many natural products and pharmaceutically active compounds.
An environmentally benign approach for the synthesis of 3,3′-pyrrolidonyl spirooxindole derivatives via a cascade Knoevenagel–Michael–cyclization multicomponent reaction
Knoevenagel–Michael–cyclization multicomponentreaction of isatin, malononitrile and α-isothiocyanato imide in the presence of a catalytic amount of triethylamine “on water” assisted with ultrasonic irradiation. The advantages of this method include high efficiency, mild reaction conditions and environmentallybenign reagents. The current process provides a simple and green method for creating diversity-oriented
Isocyanide-Based Multicomponent [2+2+1]-Cycloaddition Strategy to Construct Functionalized Spirocyclic Oxindoles
作者:Jian Li、Xueshun Jia、Haohua Jie、Chunju Li
DOI:10.1055/s-0032-1317030
日期:——
Isocyanide-based three-component [2+2+1]-cycloaddition reactions from isocyanides, activated alkynes, and isatylidene malononitriles were investigated to provide a new access to spirocyclic oxindole with five-membered carbon rings. The displacement of isatylidene malononitrile with oxindolylideneacetate essentially results in opposite regioselectivity, which adds to its attractiveness.
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.
Multicomponent Reaction to Construct Spirocyclic Oxindoles with a Michael (Triple Michael)/Cyclization Cascade Sequence as the Key Step
作者:Jian Li、Ning Wang、Chunju Li、Xueshun Jia
DOI:10.1002/chem.201104071
日期:2012.7.27
new strategy to access highly unusual tricyclic oxindoles. From a synthetic point of view, this protocol is very interesting considering the high level of complexity reached in one step. The mechanism is thought to proceed by a tripleMichael/cyclization process by using allenoate as a three carbon atom component (3 C). Furthermore, multicomponentreaction with γ‐substituted allenoate also results in