Bioreduction of the C C double bond with Pseudomonas monteilii ZMU-T17: one approach to 3-monosubstituted oxindoles
摘要:
An efficient whole cell-mediated bioreduction of 3-methylene-2-oxindoles has been developed, affording a range of 3-monosubstituted oxindoles in moderate to good yields (41-82%) with Pseudomonas monteilii ZMU-T17 as biocatalyst. Additionally, a possible reaction pathway for this bioreduction of C=C double bond was proposed. (C) 2016 Elsevier Ltd. All rights reserved.
Alkaloid inspired spirocyclic oxindoles from 1,3-dipolar cycloaddition of pyridinium ylides
作者:Jonathan Day、Maliha Uroos、Richard A. Castledine、William Lewis、Ben McKeever-Abbas、James Dowden
DOI:10.1039/c3ob41415a
日期:——
Cycloaddition reactions between pyridiniumylides and 3-alkenyl oxindoles that proceed in high yield and with very good regio- and diastereoselectivity are reported. The resulting cycloadducts have the same stereochemistry of biologically active oxindole alkaloids, such as strychnofoline.
Divergent Amine-Catalyzed [4 + 2] Annulation of Morita–Baylis–Hillman Allylic Acetates with Electron-Deficient Alkenes
作者:Silong Xu、Rongshun Chen、Zifeng Qin、Guiping Wu、Zhengjie He
DOI:10.1021/ol2032569
日期:2012.2.17
+ 2] annulation of Morita–Baylis–Hillman allylic acetates 2 with electron-deficientalkenes or diazenes has been developed for efficient syntheses of highly functionalized cyclohexenes, tetrahydropyridazines, and important spirocycles. This reaction unveils a new reactivity pattern of the intensely studied allyliccompounds 2 acting as a C4 synthon in Lewis base catalyzed annulationreactions and also
Highly Efficient Enantioselective Construction of Bispirooxindoles Containing Three Stereocenters through an Organocatalytic Cascade Michael-Cyclization Reaction
作者:Hao Wu、Li-Li Zhang、Zhi-Qing Tian、Yao-Dong Huang、Yong-Mei Wang
DOI:10.1002/chem.201203221
日期:2013.1.28
Bispirooxindole derivatives containing three stereocenters, including two spiro quaternary centers, were synthesized in a high‐yielding, atypically rapid, and stereocontrolled cascade Michael–cyclization reaction between methyleneindolinones and isothiocyanato oxindoles catalyzed by a bi‐ or multifunctional organocatalyst. Mild conditions were used to construct bispirooxindoles with excellent enantio‐
Catalytic Asymmetric Synthesis of Cyclopentene-spirooxindoles Bearing Vinylsilanes Capable of Further Transformations
作者:Angel A. Cobo、Brittany M. Armstrong、James C. Fettinger、Annaliese K. Franz
DOI:10.1021/acs.orglett.9b02852
日期:2019.10.18
for the enantioselective formation of cyclopentene-spirooxindoles containing vinylsilanes. Using a Sc(OTf)2/PyBOX/BArF complex, the spiroannulation of allenylsilanes affords products with >94:6 dr and >90:10 er. The effect of the counterion and ligand to control selectivity is discussed. The transformation of the vinylsilane is demonstrated using cross-coupling, epoxidation, and Tamao–Fleming oxidation
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