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Enantioselective synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives via an organocatalytic asymmetric Michael/cyclization cascade reaction†
Jin Xie,Xiao-Yu Xing,Feng Sha,Zhi-Yan Wu,Xin-Yan Wu
Organic & Biomolecular Chemistry Pub Date : 08/09/2016 00:00:00 , DOI:10.1039/C6OB01256F
Abstract

An efficient enantioselective synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives by a cascade reaction between pyrazolones and isatylidene malononitriles is described. With only 1 mol% of (DHQD)2PYR, chiral spirooxindole derivatives have been produced in excellent yields (96–99%) with good-to-excellent enantioselectivities (up to 91% ee).

Graphical abstract: Enantioselective synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives via an organocatalytic asymmetric Michael/cyclization cascade reaction
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