作者:Morten Meldal、Mette Knak Christensen、Klaus Bock
DOI:10.1016/0008-6215(92)80082-c
日期:1992.11
The syntheses of D-mannose 6-phosphate (4), several D-mannopyranoside 6-phosphates, and methyl alpha-D-glucopyranoside 6-phosphate are described. Phosphorylation of methyl 2,3,4-tri-O-(trimethylsilyl)-alpha-D-mannopyranoside (2) with phosphorus oxychloride followed by careful hydrolysis gave methyl alpha-D-mannopyranoside 6-phosphate (10, 81%). Direct phosphorylation of 1,2,3,4,6-penta-O-(trimethylsiyl)-alpha-D-mannopyranoside with phosphorus oxychloride followed by hydrolysis gave 4 (50% yield based on D-mannose). The first method was further used in the synthesis of methyl, butyl, and hexadecyl alpha-D-mannopyranoside 6-phosphate disodium salts, and in the synthesis of methyl alpha-D-glucopyranoside 6-phosphate disodium salt.Compound 2 was obtained in 67% yield, from methyl 2,3,4,6-tetra-O-(trimethylsilyl)-alpha-D-mannopyranoside, by selective hydrolysis with a saturated solution of potassium carbonate in methanol.Butyl and hexadecyl alpha-D-mannopyranosides were prepared by glycosidation of the respective alcohols with tetra-O-benzoyl-alpha-D-mannopyranosyl bromide in silver triflate-promoted reactions.