Synthesis of C-fucopyranosyl analogs of GDP-L-fucose as inhibitors of fucosyltransferases
摘要:
The syntheses of the C-fucopyranosyl analogs of GDP-L-fucose 2 - 5 as potential inhibitors of fucosyltransferases are reported. The synthetic routes are based on the C-glycosidation of tetra-O-acetyl-alpha-L-fucopyranose 6 under conditions that provided either beta- or alpha- C-fucosides with high stereoselectivity. Coupling to GMP was effected by Khorana's phosphomorpholidate method.
Efficient stereocontrolled synthesis of C-glycosides using glycosyl donors substituted by propane 1,3-diyl phosphate as the leaving group
摘要:
a- and beta -Glycosyl cyanides, per-O-acetyl-1,2-O-1-cyanoethylidenes and C-allyl glycopyranosides were efficiently prepared by treatment of 2,3,4-tri-O-acetyl-alpha,beta -L-rhamno-, L-fuco- and 2,3,4,6-tetra-O-acetyl-alpha,beta -D-galactopyranosyl propane-1,3-diyl phosphates with trimethylsilyl cyanide (TMSCN) and allyltrimethylsilane in the presence of trimethylsilyl triflate (TMSOTf). Similarly 2,3,4,6-tetra-O-benzyl-alpha,beta -D-manno- and D-glucopyranosyl propane-1,3-diyl phosphates were employed in the synthesis of C-glycosides. (C) 2001 Elsevier Science Ltd. All rights reserved.