A Novel Enantioselective Synthesis of α-Azido Ketones
摘要:
The asymmetric synthesis of a range of α-azido ketones 5a-e is described. Key step of the procedure is the diastereo- and enantioselective nucleophilic substitution of an iodo group in α'-silylated α-iodo ketones 3a-e with NaN3 (de = 90-≥95%, ee ≥95%). Subsequent racemizationfree carbon-silicon bond cleavage using 3HF•Et3N gives the corresponding α-azido ketones 5a-e in good yield (54-86%) with high enantiomeric excesses (ee = 90-≥95%).