2,5-anhydro-1,3,4-tris-O-(phenylmethyl)-D-mannitol → 2,5-anhydro-D-mannitol

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In accordance with Flowchart E, 2,5-anhydro-3,4,6-tris-O-(phenylmethyl)-D-mannose 29 is reacted with lithium aluminum hydride in ether at reflux temperature under argon, giving 2,5-anhydro-1,3,4-tris-O-(phenylmethyl)-D-mannitol 38. Compound 38 is hydrogenated in methanol/acetic acid over palladium on carbon, giving 2,5-anhydro-D-mannitol 39, which is then reacted with diphenyl phosphorochloridate in pyridine at reduced temperature, giving the product of Formula I where R', R",R'" and R"" are phenyl, 2,5-anhydro-D-mannitol, 1,6-bis(diphenyl phosphate) 40. Compound 40 is hydrogenated in methanol over platinum oxide, giving the product of Formula I where R', R",R'" and R"" are hydrogen, 2,5-anhydro-D-mannitol, 1,6-bis(dihydrogen phosphate) 41. Compounds 40 and 41 are disclosed in Voll et al., Carbohydrate Research, 95, 145-154 (1981), but are prepared by a different process. Substituting other phosphorylating agents in the reaction from 39 to 40, as described in Flowchart A, will result in the corresponding tetraesters and mixed tetraesters. ##STR18##

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