Synthesis of β-d-galactofuranosyl nucleoside analogues. A new type of β-d-galactofuranosidase inhibitor
摘要:
The development of beta -D-galactofuranosidase inhibitors provides a good chemotherapeutic target for treatment of major human diseases, because beta -D-galactofuranose is a constituent of important pathogen microorganisms but is absent in mammals. With this purpose we have prepared beta -D-galactofuranosyl nucleoside analogues, derived by the addition of nucleophiles to perbenzoylated beta -D-galactofuranosyl isothiocyanate, a compound previously prepared in this laboratory. N-beta -D-Galactofuratlosyl-O-ethylthiourethane N-beta -D-galactofuranosyl-4-oxoimidazolidi N-beta -D-galactofuranosyl-4-imidazoline-2-thione, and N-beta -D-galactofuranosyl-4-methoxyimidazolidine-2-thione, were prepared. The biological assays showed that imidazoline and imidazolidine-2-thione derivatives act as a new type of exo beta -D-galactofuranosidase inhibitor. (C) 2001 Elsevier Science Ltd. All rights reserved.
Reactions of per-O-benzoyl-β-D-Galf isothiocyanate, a chiral resolving agent
摘要:
Tetra-O-benzoyl-beta-D-galactofuranosyl isothiocyanate (1) was readily prepared (90% yield) from per-O-benzoyl-D-galactofuranose, via the glycosyl bromide. Reaction of 1 with alcohols, amines and amino acids afforded a variety of glycosylthiourethanes and glycosylthioureides. The isothiocyanate 1 showed to be useful as a chiral resolving agent. The resolution of racemic primary and secondary amines and aminoalcohols was readily accomplished, in analytical and preparative scale, by condensation of such compounds with 1. (C) 1997 Elsevier Science Ltd.