materials toward more complex oxindole-based structures. These molecules can be prepared by the reduction of a 3-ylidene oxindole precursor by classical metal-catalysed chemical reductions of the olefin. In this work we present a biocatalytic approach for the reduction of oxindole-based olefins using baker'syeast. All the substrates were efficiently reduced in high yields. When an α,β-unsaturated ketone
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.
Regioselective ring expansion followed by H-shift of 3-ylidene oxindoles: a convenient synthesis of N-substituted/un-substituted pyrrolo[2,3-<i>c</i>] quinolines and marinoquinolines
and metal-free protocol for the synthesis of 4-oxo-4,5-dihydro-3H-pyrrolo[2,3-c]quinolines. The present method under mild reaction conditions with wide functional group compatibility gives several unexplored N-substituted/unsubstituted 4-oxo-4,5-dihydro-3H-pyrrolo[2,3-c]quinolines and marinoquinolines in good to excellent yields. Mechanistic insights for the synthesis of N-substituted pyrroloquinolines
在此,我们报告了一种用于合成 4-oxo-4,5-dihydro-3 H -pyrrolo[2,3 - c ] 喹啉的简单且无金属的方案。本方法在温和的反应条件下具有广泛的官能团相容性,以良好至优异的产率提供了几种未开发的 N-取代/未取代 4-oxo-4,5-dihydro-3 H -pyrrolo [2,3 - c ] 喹啉和 marinoquinolines。N-取代吡咯并喹啉合成的机理研究揭示了 3-亚基氧吲哚的扩环和 H 位移是关键步骤。
XY–ZH systems as potential 1,3-dipoles. Part 6. Metallo-1,3-dipoles. Cycloadditions of divalent metal complexes of glycine and alanine imines to electronegative olefins
Copper(II), zinc(II), and cadmium(II) complexes of imines derived from α-oxo acids and glycine or alanine undergo stereospecific cycloaddition at room temperature to 1,2-disubstituted electronegative olefins in the presence of weak base. Corresponding reactions of lead(II) complexes give insoluble cycloadducts. In contrast, the reactions of the same metallo imines with methyl acrylate, phenyl vinyl sulphone
The first catalytic asymmetric exo′‐selective [3+2] cycloaddition of methyleneindolinones with iminoesters was achieved for construction of novel diastereomers of spiro[pyrrolidin‐3,3′‐oxindole]. By using the imidazoline–aminophenol‐ligand complex [Ni(OAc)2–(L1)], the reaction proceeds in the stepwise Michael–Mannich reaction to give the exo′ adducts as stable isomers (see scheme).