The reaction usually begins with the formation of an enolate of the acylphosphonate. This enolate is generated by deprotonation of the acylphosphonate using a base. The chiral catalyst plays a crucial role in controlling the stereochemistry. It might coordinate with the enolate to help direct the reaction. The nucleophilic enolate then attacks the electrophilic center on the 3-alkylidene oxindole. This forms a carbon-carbon bond and generates the vinylogous aldol product. The stereochemistry of the product is controlled by the chiral catalyst, leading to high enantioselectivity.
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