作者:Arun K. Ghosh、Alexander Bischoff、John Cappiello
DOI:10.1021/ol0101279
日期:2001.8.1
[GRAPHICS]An efficient and highly stereoselective synthesis of the gastroprotective natural product Al-77-B is described. The stereocenters of the hydroxy amino acid moiety were generated by an ester-derived titanium-enolate-mediated syn-aldol reaction, a Curtius rearrangement, and application of Dondoni's aldehyde homologation. Condensation with the dihydroisocoumarin fragment and subsequent deprotecting transformations furnished optically active Al-77-B.