Trityl chloride → HCID 70360336, compound

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Reaction Steps

In accordance with Flowchart C, 2,5-anhydro-D-glucitol 19 is reacted with trityl chloride in pyridine, giving 2,5-anhydro-1,6-bis-O-(triphenylmethyl)-D-glucitol 20, which is then reacted with sodium hydride and benzyl bromide in dimethylformamide, giving 2,5-anhydro-3,4-bis-O-(phenylmethyl)-1,6-bis-O-(triphenylmethyl)-D-glucitol 21. Compound 21 is then reacted with acetic acid at about 80° C., giving 2,5-anhydro-3,4-bis-O-(phenylmethyl)-D-glucitol 22, which is then reacted with diphenyl phosphorochloridate in pyridine at reduced temperature, giving 2,5-anhydro-3,4-bis-O-(phenylmethyl)-D-glucitol, 1,6-bis(diphenyl phosphate) 23. Substitution of other esterifying agents as described in Flowchart A will result in the corresponding tetraesters. Compound 23 is then hydrogenated in methanol/acetic acid over palladium on carbon, giving the product of Formula I where R', R", R'" and R"are phenyl, 2,5-anhydro-D-glucitol, 1,6-bis(diphenyl phosphate) 24. which may then be hydrogenated in methanol over platinum oxide, giving the product of Formula I where R', R", R'" and R"" are hydrogen, 2,5-anhydro-D-glucitol, 1,6-bis(dihydrogen phosphate) 25. Compounds 24 and 25 are disclosed in Voll et al., Carbohydrate Research, 95, 145-154 (1981), but are prepared by a different process. ##STR16##

Provenance & Evidence