Dipropylamine → HCID 18392572, compound

Participants

Reaction Steps

A solution of 3.30 g (0.0098 mol) of (S)-8-chloro-9-oxo-12,12a-dihydro-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxylic acid prop-2-ynylamide in 60 mi of acetic acid was treated with 3.30 g (0.0147 mol) of N-iodosuccinimide while gassing with argon. After stirring at room temperature for 24 hrs. the dark brown suspension obtained was completely freed from the solvents and dried azeotropically several times with toluene. The dark viscous residue was dissolved in 60 ml of THF, treated with 11.9 ml (0.0865 mol) of dipropylamine and stirred at room temperature for 24 hrs. The suspension obtained was filtered and the solution was completely freed from the solvents, the residue was partitioned between ethyl acetate and dilute aqueous hydrochloric acid and extracted. The aqueous-acidic phase was made basic and extracted with ethyl acetate. The organic phase was concentrated and the residue was chromatographed over silica gel with dichloromethane/methanol 98:2 as the eluent. There were obtained 1.19 g (28%) of (S)-8-chloro-1-(5-dipropylaminomethyl-oxazol-2-yl)-12,12a-dihydro-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepin-9-one as yellow crystals; m.p. 148°-151° (dec.) and [α]D20 =-101.7° (MeOH, c=1%)

Provenance & Evidence