作者:Anna Bernardi、Giovanna Boschin、Anna Checchia、Maria Lattanzio、Leonardo Manzoni、Donatella Potenza、Carlo Scolastico
DOI:10.1002/(sici)1099-0690(199906)1999:6<1311::aid-ejoc1311>3.0.co;2-w
日期:1999.6
The pseudo tetrasaccharide 2 was designed to mimic ganglioside GM1, the membrane receptor of both the cholera toxin and of the heat-labile toxin of E. coli. Compound 2 retains the Gal and Neu5Ac recognition determinant of GM1 and uses as the scaffold element a new, conformationally restricted cyclohexanediol (DCCHD 3), with the same relative and absolute configuration of natural galactose; The diol 3 was enantioselectively synthesized by an asymmetric Diels-Alder reaction, followed by dihydroxylation of the resulting cyclohexene. Glycosylation of 3 with the sialyl donor 17 and the Gal beta(l-3)GalNAc donor 15, followed by removal of the protecting groups, completed the synthesis of 2.