Abstract
The HBF 4 (0.1 equiv)-catalyzed Mannich-type reactions of ketene silyl acetals with aldimines proceeded smoothly in water in the coexistence of as low as I mol% of SDS. Furthermore, the Mannich-type reaction also took place in water in the absence of SDS by means of 0.3 equiv of HBF 4 to afford the corresponding β-amino esters in high yields.
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