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The combined activity of (S)-proline and an achiral tetraphenylborate TBD-derived guanidinium salt permits the aldol reaction between azidoacetone and aromatic, or heteroaromatic aldehydes. The α-azido-β-hydroxy methyl ketones obtained as products can be isolated in good yield, with high diastereo- and enantioselectivity.

Highly enantioselective synthesis of α-azido-β-hydroxy methyl ketones catalyzed by a cooperative proline–guanidinium salt system