A zinc‐mediated α‐selective prenylation of isatin‐derived imine in a sealed tube has been developed. The method is highly efficient and operationally simple with its use of readily available prenyl bromide as the prenyl source. The obtained prenylated adduct can be further manipulated to other more complicated derivatives through cyclization or oxidation.
Abstract An efficient and facile method for the synthesis of novel spiro[indole-2,2′-pyrroles] from N-methyl-3-isatin imines, t-butyl isocyanide, and dialkyl acetylenedicarboxylate has been achieved by [3 + 2] cyclo addition reaction. All the products were purified by column chromatography as yellow solids and confirmed with 1H NMR, 13C NMR, fast atom bombardment, mass, and infrared. Compound 11 was
A Copper-Catalyzed One-Pot, Three-Component Diastereoselective Synthesis of 3-Spiroazetidinimine-2-oxindoles and Their Synthetic Transformation into Fluorescent Conjugated Indolones
作者:Somasundharam Periyaraja、Ponnusamy Shanmugam、Asit Baran Mandal
DOI:10.1002/ejoc.201301244
日期:2014.2
copper(I)-catalyzed one-pot, three-componentdiastereoselectivesynthesis that provides new 3-spiroazetidinimine-2-oxindoles in excellent yield has been accomplished. The 3-spiroazetidinimine-2-oxindoles underwent a facile ring-opening reaction of the spiroazetidinimine unit by treatment with KOH/MeOH and p-thiocresol under basic conditions to afford two new classes of fluorescentconjugatedindolones. This method
Dual Behavior of Isatin-Based Cyclic Ketimines with Dicarbomethoxy Carbene: Expedient Synthesis of Highly Functionalized Spirooxindolyl Oxazolidines and Pyrrolines
作者:T. Rajasekaran、G. Karthik、B. Sridhar、B. V. Subba Reddy
DOI:10.1021/ol400287q
日期:2013.4.5
devised for the synthesis of a wide range of spirooxindolyl oxazolidines via an intermolecular 1,3-dipolarcycloaddition of carbonyl ylides generated from dimethyl diazomalonate and aromatic aldehydes, with cyclic ketimines using 5 mol % of Rh2(OAc)4 under mild conditions. Similarly, highly functionalized spirooxindolyl pyrrolines have also been prepared through1,3-dipolarcycloaddition of azomethine
Chiral Squaramide-Catalyzed Asymmetric Mannich Reactions for Synthesis of Fluorinated 3,3′-Bisoxindoles
作者:Bing-Yu Li、Da-Ming Du
DOI:10.1002/adsc.201800513
日期:2018.8.17
squaramide‐catalyzed asymmetric Mannichreaction of 3‐fluorooxindoles to isatin‐derived imines for synthesis of fluorinated 3,3′‐bisoxindoles with two contiguous stereocenters under mild conditions was developed. The corresponding 3,3′‐bisoxindoles were obtained in excellent yields with excellent diastereo‐ and enantioselectivities (up to 99% yield, >99:1 dr and >99% ee). What's more, this reaction can be gram‐scaled