The synthesis of diosgenyl 2-amino-2-deoxy-β-d-glucopyranoside hydrochloride
摘要:
The N-trifluoroacetyl- and N-tetrachlorophthaloyl-protected bromide of D-glucosamine has been used for the first time as a glycosyl donor for the glycosylation of diosgenin [(25R)-spirost-5-en-3 beta-ol]. Both 1,3,4,6-tetra-O-acetyl-2-deoxy-2-trifluoroacetamido-beta-D-glucopyranoside and 1,3,4,6-tetra-O-acetyl-2-deoxy-2-tetrachlorophthalimido-alpha,beta-D-glucopyranoside were transformed into the appropriate glycosyl bromides. These reacted with diosgenin under mild conditions, using silver triflate as a promoter, and gave the corresponding protected diosgenyl glycosides. Each was deprotected to give diosgenyl 2-amino-2-deoxy-beta-D-glucopyranoside hydrochloride. The structures of the new glycosides were established by H-1 NMR spectroscopy. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis and selective anticancer activity of steroidal glycoconjugates
作者:María A. Fernández-Herrera、Hugo López-Muñoz、José M.V. Hernández-Vázquez、Luis Sánchez-Sánchez、María L. Escobar-Sánchez、B. Mario Pinto、Jesús Sandoval-Ramírez
DOI:10.1016/j.ejmech.2012.06.027
日期:2012.8
The synthesis of glucosamine derivatives of the steroidalsapogeninsdiosgenin and hecogenin using the N-phthaloyl protected trichloroacetimidate of d-glucosamine as donor and TMSOTf as promoter is reported. The corresponding glycoconjugates were transformed into their acetamido derivatives and the hydrochloride salt (fromdiosgenin) and tested against HeLa, CaSki, and ViBo cervicouterine cancer cells
2-Acetamido-2-deoxy-D-glucose hydrochloride (D-glucosamine hydrochloride) has been used for the preparation of 1,3.4.6-tetra- O-acetyl-2-deoxy-2-trifluoroacetqamido-beta- (4) and 2-tetrachlorophthalimido-alpha, beta-D-glucopyranose (6) which have been transformed into the appropriate bromides and the chloride. Both bromo and chloro sugars were used as a glycosyl donors for the glycosylation of diosgenin [(25R)-spirost-5-en-3beta-ol]. These condensations were conducted under mild conditions, using silver triflate as a promoter, and gave diosgenyl glycosides 9 and 12. Each of them was converted into diosgenyl 2-amino-2-deoxy-beta-D-glucopyranoside hydrochloride (11) and N-acylamido derivatives. The structures of all new glycosides were established by H-1 and C-13 NMR spectroscopy. These diosgenyl glycosides are the first saponins containing the D-glucosamine residue that have been synthesized. These compounds show promising antitumor activities, The synthetic saponins increase the number of apoptotic B cells, in combination with cladribine (2-CdA). that are isolated from chronic lymphotic leukemia (B-CLL) patients. (C) 2002 Published by Elsevier Science Lid.