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An efficient chiral squaramide‐catalyzed enantioselective decarboxylative addition reaction of β‐keto acids to isatin imines has been developed. The reaction proceeds smoothly using 20 mol% of organocatalyst to afford the chiral 3‐aminooxindoles in high yield and excellent enantioselectivities.
The decarboxylative carbon-carbon bond formation 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...
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