Dimethyl Sulfate → HCID 70004538, compound

Participants

Reaction Steps

Dimethyl sulfate (2.52 g) was added dropwise to a mixture of intermediate 9 (4.4 g) and sodium hydroxide (0.8 g) in water (10 ml), while cooling in ice water. The reaction mixture was stirred for 15 minutes at RT, then it was heated for 1 hour using a warm water bath. The reaction mixture was cooled and extracted with CH2Cl2. The precipitate in the separated aqueous layer was filtered off and purified by column chromatography over silica gel (eluent: CH2Cl2 /CH3OH 97/3). The pure fractions were collected and the solvent was evaporated. The residue was crystallized from CH3CN. The crystals were filtered off and dried, yielding 2 g (42%) of 3-(2-hydroxyethyl)-9-methoxy-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one (intermediate 10).

Provenance & Evidence