A cascade
Michael addition/alkylation reaction between 3-chlorooxindoles
and α-cyano chalcones catalyzed using a multifunctional quinine-derived
aminoindanol-thiourea substance was investigated. A series of spirooxindoles
incorporating a densely substituted cyclopropane motif were efficiently
obtained with moderate to excellent diastereo- and enantioselectivity
and further transformed to products with versatile structural diversity.
Density functional theory (DFT) calculations indicated that the tentative
intramolecular hydrogen bonds in the chiral catalyst were crucial
for the stereocontrol.
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