Conversion of one hydroxy group in a diol to a phenyl ether with triphenylbismuth diacetate, a new glycol reaction showing strong axial preference in six-membered rings
Efficient Sialylation with Phenyltrifluoroacetimidates as Leaving Groups
作者:Sutang Cai、Biao Yu
DOI:10.1021/ol0353161
日期:2003.10.1
[GRAPHICS]Sialylation with N-phenyltrifluoroacetimidates as leaving groups and a catalytic amount of TMSOTf as promoter compares favorably with the previous protocols for direct sialylation and expand in essence the scope of the Schmidt glycosylation reaction.
Regioselective removal of the anomeric O-benzyl from differentially protected carbohydrates
作者:Nigel Kevin Jalsa
DOI:10.1016/j.tetlet.2011.09.130
日期:2011.12
A mild, regioselective deprotection of the anomeric O-benzyl from multi-functionally protected carbohydrates via catalytic transfer hydrogenation is described. The protocol is tolerant of O-benzyl and O-benzylidene protections at non-anomeric positions, groups which are normally labile under typical hydrogenolysis conditions. (C) 2011 Elsevier Ltd. All rights reserved.
DAVID, S.;THIEFFRY, A., J. ORG. CHEM., 1983, 48, N 4, 441-447
作者:DAVID, S.、THIEFFRY, A.
DOI:——
日期:——
A mild procedure for the regiospecific benzylation and allylation of polyhydroxy-compounds via their stannylene derivatives in non-polar solvents
作者:Serge David、Annie Thieffry、Alain Veyrières
DOI:10.1039/p19810001796
日期:——
acetalated. In such a collection may be found all the possible arrangements, except one, of two, three, or four hydroxy-groups on a β-D-galactopyranoside ring. Regiospecific substitution in good yield was observed on nine of the starting polyols. Benzylation in this way of benzyl 2,3-di-O-benzyl-α-D-glucopyranoside only gave the 6-O-benzyl ether in 80% yield, a great improvement over the reaction in NN-dimethylformamide
Conversion of one hydroxy group in a diol to a phenyl ether with triphenylbismuth diacetate, a new glycol reaction showing strong axial preference in six-membered rings