Iodonium ion assisted synthesis of a common inner core trisaccharide fragment corresponding to the cell-wall phenolic glycolipid of Mycobacterium kansasii
作者:Korien Zegelaar-Jaarsveld、Gijs A. van der Marel、Jacues H. van Boom
DOI:10.1016/s0040-4020(01)89043-8
日期:——
The spacer containing trimer 4-(aminoethyl)phenyl 2,4-di-O-Me-3-O-[2-O-methyl-3-O-(4-O-acetyl-2-O-methyl-alpha-L-fucopyranosyl)-alpha-L-rhamnopyranosyl]-alpha-L-rhamnopyranoside (2) was prepared by stepwise extension of 4-[2-(benzyloxycarbonyl-amino)ethyl]phenyl 2,4-di-O-methyl-alpha-L-rhamnopyranoside (19) with property protected ethyl thioglycosides of L-rhamnose 8 and L-fucose 12 or 16 using iodonium ions as promotors. The resulting trimers 22 or 23 were deblocked in two steps to give homogeneous 2. Alternatively, fully protected trimer 22 was assembled by iodonium ion assisted condensation of the phenyl 1-thio-alpha-L-rhamnopyranoside 29 with 12 followed by extension of dimer 31 with 19.
The synthesis and biological evaluation of mycobacterial p-hydroxybenzoic acid derivatives (p-HBADs)
作者:Jean Bourke、Corinna F. Brereton、Stephen V. Gordon、Ed C. Lavelle、Eoin M. Scanlan
DOI:10.1039/c3ob42277a
日期:——
Synthetic p-hydroxybenzoic acid derivatives (p-HBADs) from Mycobacterium tuberculosis have the ability to suppress host immune response in vitro.