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
Phosphine-Catalyzed Asymmetric Formal [4+2] Tandem Cyclization of Activated Dienes with Isatylidenemalononitriles: Enantioselective Synthesis of Multistereogenic Spirocyclic Oxindoles
作者:Fang-Le Hu、Yin Wei、Min Shi
DOI:10.1002/adsc.201301070
日期:2014.3.10
enantioselective formal [4+2] tandem cyclizations between isatylidenemalononitriles and activated dienes catalyzed by bifunctional chiral phosphine catalysts have been developed, yielding multistereogenic spirocyclicoxindoles in high yields and excellent optical purity. This reaction is accomplished via a tandem Rauhut–Currier/Michael/Rauhut–Currier reactionsequence.
已开发出双功能手性膦催化剂催化的异亚乙基丙二腈和活化的二烯之间的第一个高度对映选择性的正式[4 + 2]串联环化反应,可高收率和出色的光学纯度产生多立体异构螺环式吲哚。该反应是通过串联的Rauhut-Currier / Michael / Rauhut-Currier反应序列完成的。
Grinding assisted, column chromatography free decarboxylative carbon-carbon bond formation: Greener synthesis of 3, 3-disubstituted oxindoles
The decarboxylative carbon-carbonbondformation reaction of β-ketoacid derivatives with isatylidene malononitrile derivatives catalyzed by DBU afford adducts in excellent yield. The desired product can be easily isolated using simple filtration method without performing any column chromatography. The decarboxylative adduct was further subjected to reductive-cyclization to obtain biologically important
A Three-Component Condensation for the Construction of the Spiro[indoline-3,3′-piperidin]-2-one Skeleton
作者:Hai-Bin Yang、Xiao-Yang Guan、Yin Wei、Min Shi
DOI:10.1002/ejoc.201200185
日期:2012.5
Treatment of pyridine and dimethyl acetylenedicarboxylate derivatives with N-substituted isatylidene derivatives resulted in three-componentcondensations, affording 1′,9a′-dihydrospiro[indoline-3,2-quinolizin]-2-one derivatives in high yields and with good diastereoselectivities through 1,4-dipolar cycloadditions.
An efficient enantioselective Friedel–Crafts alkylation/cyclization tandem reaction of the indole carbocyclic ring with isatylidene malononitriles has been performed successfully by using a new bifunctional tertiary amine-urea catalyst. A series of chiral spirooxindole–pyranoindole products were obtained in excellent yields (up to 98% yield) with moderate to good enantioselectivities (up to 85% ee)