Diisopropyl Ether → HCID 21216869, compound

Participants

Reaction Conditions

Reaction Steps

1 g (2.95 mmol) 6,7,12,13-Tetrahydro-6-methyl-5,7-dioxo-5H-indolo[2,3-a]pyrrolo[3,4-c]carbazole (precursor for Example 5) is dissolved in 15 ml dry dimethylformamide and added dropwise, under an atmosphere of argon, to a suspension of 100 mg (3.3 mmol) sodium hydride (80% in paraffin oil) in 25 ml dimethyl formamide. After stirring for 1 hour at 20° C., 915 mg (5.9 mmol) 1,1-diethyl-3-hydroxyazetidinium chloride are added thereto and the reaction mixture is stirred for 3 days at 20° C. The reaction mixture is evaporated in a vacuum, the residue is taken up in 150 ml of water and 500 ml ethyl acetate and the organic phase is separated off and dried over anhydrous sodium sulphate. After filtration, the filtrate is evaporated and the residue is chromatographed on silica gel with dichloromethane/methanol (99:1 v/v). The fraction with the Rf 0.2 in dichloromethane/methanol (95:5 v/v) is isolated, stirred with 20 ml diisopropyl ether and the crystals obtained are filtered off. (±)-12-(3-Diethylamino-2-hydroxy-1-propyl)-6,7,12,13-tetrahydro-6-methyl-5,7-dioxo-5H-indolo[2,3-a]pyrrolo[3,4-c]-carbazole is obtained in the form of yellow crystals; decomposition point 220-228° C.

Provenance & Evidence