Mannich-type Reactions of in Situ Generated N-Acyliminium Ions from α-Amido p-Tolylsulfones with Silyl Enolates

다국어 초록 (Multilingual Abstract)

Bismuth tribromide (BiBr_3) catalyzed Mannich-type reactions of N-acyliminium ions which generated in situ from N-benzyloxycarbonylamino p-tolylsulfones have been developed. In the presence of catalytic amount of BiBr_3, N-benzyloxycarbonylamino p-tolylsulfones prepared from aromatic and aliphatic aldehydes reacted with silyl enol ether and silyl enol ester under mild reaction conditions to afford N-Cbz-protected β-amino ketones and N-Cbz-protected β-amino esters in moderate to good yield, respectively.

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