Enantioselective synthesis of 2-sulfenylated aldehydes: Alkylation of sulfenylated acetaldehyde SAMP-hydrazones
作者:Dieter Enders、Thomas Schäfer、Olivier Piva、Andrea Zamponi
DOI:10.1016/s0040-4020(01)87015-0
日期:1994.3
A practical and efficient enantioselective synthesis of 2-sulfenylated aldehydes (S)-6 is described, based on the alpha-alkylation of sulfenylated acetaldehyde SAMP hydrazones (S)-4, easily prepared from bromoacetaldehyde diethyiacetal 1, thiols and (S)-1-amino-2-methoxymethyl-pyrrolidine (SAMP). A chemoselective oxidative cleavage of the intermediate SAMP hydrazones (S,S)-5 with ozone gives rise to the title compounds (S)-6 in good overall yields and high enantiomeric excesses of up to 97%.