Dichloromethane → HCID 69228552, compound

Participants

Reaction Conditions

Reaction Steps

2.0 g of (7R,8R,9R)-7,8-dihydroxy-2-methoxymethyl-3-methyl-9-phenyl-7,8,9,10-tetrahydroimidazo[1,2-h][1,7]naphthyridine are dissolved in 50 ml 2-methoxyethanol and 1 ml of methane sulfonic acid is slowly added. The reaction is heated at 55° C. for 3 h and subsequently poured onto 80 ml icewater and 100 ml dichloromethane. The organic layer is separated and the aqueous phase extracted three times with dichloromethane. The combined organic phases are dried over anhydrous sodium sulfate and the solvent removed in vacuo. The two diastereomers are separated by column chromatography on silica gel (eluent: diethyl ether) to afford 850 mg (36%) of (7S,8R,9R)-8-hydroxy-7-(2-methoxyethoxy)-2-methoxymethyl-3-methyl-9-phenyl-7,8,9,10-tetrahydroimidazo[1,2-h][1,7]naphthyridine (28a, m.p. 63-65° C.) and 400 mg (17%) of (7R,8R,9R)-8-hydroxy-7-(2-methoxyethoxy)-2-methoxymethyl-3-methyl-9-phenyl-7,8,9,10-tetrahydroimidazo[1,2-h][1,7]naphthyridine (28b, m.p. 5-53° C.).

Provenance & Evidence