1,3-Dichloroacetone → HCID 21842289, compound

Participants

Reaction Steps

A yellow suspension of 8.60 g (0.0316 mol) of 5-methyl-6-oxo-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepine-3-thiocarboxamide in 200 ml of dioxan was treated with 4.41 g (0.0347 mol) of 1,3-dichloro-2-propanone. The suspension was boiled at reflux for 3 hrs., cooled and filtered. The solution was boiled at reflux for a further 16 hrs., cooled and suction filtered. The product was recrystallized from hot acetonitrile. There were obtained 5.4 g (65%) of 3-(4-chloromethyl-thiazol-2-yl)-5-methyl-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepin-6-one as white crystals. An analytical sample could be obtained from the mother liquor after chromatography (silica gel, cyclohexane/ethyl acetate 1:1) and recrystallization (acetonitrile); m.p. 248°-249°.

Provenance & Evidence