Calixarene-derived chiral tertiary amine–thiourea organocatalyzed asymmetric Michael additions of acetyl acetone and dimethyl malonate to nitroolefins
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Add time:07/20/2019 Source:sciencedirect.com
Novel bifunctional chiral thiourea-tertiary amines bearing a calix[4]arene scaffold were synthesized and applied in catalytic asymmetric Michael addition of acetyl acetone and dimethyl malonate to nitroolefins. The corresponding adducts were obtained in excellent yields (up to 99%) and with high enantioselectivities (up to 94% ee).
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