A One‐Pot Ring‐Opening/Ring‐Closure Sequence for the Synthesis of Polycyclic Spirooxindoles
作者:Ji‐Wei Ren、Qing‐Lan Zhao、Jun‐An Xiao、Peng‐Ju Xia、Hao‐Yue Xiang、Xiao‐Qing Chen、Hua Yang
DOI:10.1002/chem.201900409
日期:2019.3.27
One‐pot ring‐opening/ring‐closure process of combining methyleneindolinone with 3‐aminooxindole has been developed in this work. Novel polycyclic spirooxindoles were efficiently assembled under mild conditions in high yields (up to 95 %) with moderate to good diastereoselectivities (up to >95:5 d.r.) through simple filtration.
Catalytic Enantioselective Carboannulation with Allylsilanes
作者:Nicolas R. Ball-Jones、Joseph J. Badillo、Ngon T. Tran、Annaliese K. Franz
DOI:10.1002/anie.201403607
日期:2014.9.1
scandium(III)/indapybox complex with tetrakis‐[3,5‐bis(trifluoromethyl)phenyl]‐borate (BArF) to enhance catalytic activity and control stereoselectivity. Functionalized cyclopentanes containing a quaternary carbon center are derived from alkylidene oxindole, coumarin, and malonate substrates with high stereoselectivity. The enantioselective 1,4‐conjugate addition and enantioselective lactone formation
Efficient construction of highly functionalized spiro[γ-butyrolactone-pyrrolidin-3,3′-oxindole] tricyclic skeletons via an organocatalytic 1,3-dipolar cycloaddition
作者:Long Wang、Xiao-Mei Shi、Wei-Ping Dong、Li-Ping Zhu、Rui Wang
DOI:10.1039/c3cc40669e
日期:——
Highly functionalized spiro[gamma-butyrolactone-pyrrolidin-3,3'-oxindole] tricyclic skeletons were delivered successfully with high optical purity using an effective yet simple procedure.
<i>L</i>-Pyroglutamic Sulphonamide as Hydrogen-Bonding Organocatalyst: Enantioselective Diels–Alder Cyclization to Construct Carbazolespirooxindoles
作者:Ji-Wei Ren、Jing Wang、Jun-An Xiao、Jun Li、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.joc.7b00733
日期:2017.6.16
applied in catalyzing asymmetric Diels–Aldercyclization of methyleneindolinones with 2-vinyl-1H-indoles to efficiently assemble carbazolespirooxindoles in excellent stereoselectivity (up to 99% ee, >20:1 dr) and yields (up to 99%). Mechanistic studies disclosed that the well-designed hydrogen-bonding modes between L-pyroglutamic sulphonamide and substrates were crucial for stereocontrol in the cyclization
Synthesis of Oxindolyl Pyrazolines and 3-Amino Oxindole Building Blocks <i>via</i> a Nitrile Imine [3 + 2] Cycloaddition Strategy
作者:Anand Singh、Amanda L. Loomer、Gregory P. Roth
DOI:10.1021/ol302425h
日期:2012.10.19
The [3 + 2] dipolar cycloaddition reaction of nitrite imines with 3-alkylidene oxindoles is described. The pyrazoline spiroadducts were obtained in high yields and with excellent regio- and diastereoselectivities. These spirocyclic intermediates have been elaborated to synthetically versatile 3-amino oxindole building blocks such as beta-amino nitrile, 1,3-diamine, and pyrrolo[2,3-b]indoline derivatives.