Catalytic nucleophilic addition to the carbon-nitrogen double bond of an imino group in an asymmetric fashion provides a direct connective and attractive route to enantioenriched N-protected amines with structural diversity. In the last decades, significant achievements have been made in the field of catalytic enantioselective reactions involving the use of a-amido sulfones as in situ equivalents of activated imines. These, in combination with diverse nucleophiles, are used to prepare optically pure amines or N-protected amides. This review focuses on the recent advances in the synthetic applications of a-amido sulfones as reactive precursors of imines in the asymmetric addition of organometallic reagents, Mannich, aza-Henry, Strecker, and other asymmetric nucleophilic addition reactions.

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Review: about 100 refs.

For the first time, an unusal cleavage of N‐tert‐butyloxycarbonyl (N‐Boc) protection from N‐Boc‐protected benzamide under basic conditions in excellent yields is reported. The deprotection involves the N‐Boc emigration from the benzamide to form 2‐O‐Boc group followed by O‐Boc deprotection on the phenyl ring.

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