Diphenylprolinol Silyl Ether Catalysis in an Asymmetric Formal Carbo [3 + 3] Cycloaddition Reaction via a Domino Michael/Knoevenagel Condensation.

[摘要]：Diphenylprolinol silyl ether I (R1 = H, R2 = H, TMS, TBS; R1 = CF3, R2 = TMS) was found to catalyze the formal carbo [3 + 3] cycloaddn. reaction through the domino reaction via the Michael reaction, followed by Knoevenagel condensation of the a,b-unsatd. aldehyde and di-Me 3-oxopentanedioate, affording substituted cyclohexenone derivs., e.g. II, with excellent enantioselectivity.

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