Rearrangement of β-Chloro <i>N</i>-Oxides to Hydroxylamines: Opening of the Oxazetidinium Intermediate by Different Nucleophiles
作者:Ulrike K. Wefelscheid、Simon Woodward
DOI:10.1021/jo900031e
日期:2009.3.6
The rearrangement of β-chloro N-oxides to hydroxylamines is stereospecific in accord with the presence of a cyclic oxazetidinium intermediate. The latter opens with a range of nucleophiles (carboxylates, cyanide, azide, and thiols).
derivatives with a benzyl group by reductive alkylation of amino acid derivatives with α-picoline-borane is described. Amino acid esters or amino alcohols were treated with aryl aldehydes in methanol/acetic acid in the presence of α-picoline-borane to give N-benzyl-protected amino acid derivatives in good yields. amino acid esters - amino alcohols - benzylation - protecting groups - reductions