Glyoxal trimeric dihydrate → HCID 10292657, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of [(2R)-7,8-diamino-2,3-dihydro-1,4-benzodioxin-2-yl]methyl 4-methylbenzenesulfonate (2.226 g, 5.258 mmole) in water (50 mL) was added a solution of glyoxal trimeric dihydrate (1.104 g, 5.258 mmole) in ethyl alcohol (50 mL) and the reaction mixture was heated at 60° C. for 3 hours. The reaction mixture was allowed to cool to room temperature and was diluted with aqueous sodium hydrogen carbonate (250 mL) and extracted with ethyl acetate (2×100 mL). The combined organic extracts were washed with water (100 mL), aqueous sodium chloride (100 mL), dried (magnesium sulfate) and the solvent was removed in vacuo to give a crude solid. Purification by flash column chromatography (silica, ethyl acetate:hexanes 7:3) gave 1.135 g (58%) of the (R)-enantiomer of the title compound as a brown crystalline solid. Rf=0.27 (silica, ethyl acetate:hexanes 3:2); mp 124–127° C.

Provenance & Evidence