Piperazine → HCID 23194053, compound

Participants

Reaction Steps

Piperazine (1.1 g, 12.8 mmol) was suspended in 15 ml of dry tetrahydrofuran at -20° C. 9-Chloro-9H-indeno[1,2-b]pyrazine-2,3(1H, 4H)-dione (1.5 g, 6.4 mmol) was added over 25 min. and the temperature was slowly rised to room temperature while stirring. After 20 hours another portion of piperazine (0.55 g, 6.4 mmol) was added and stirring was continued for 72 hours. The reaction mixture was evaporated in vacuo to dryness and the remanence was suspended in 10 ml 6M HCl. The product was filtered off and washed with 1M HCl and dried to give 1.7 g of the crude product, which was purified by dissolving in aqueous sodium hydroxide and precipitated by adding to hydrochloric acid. The procedure was repeated and the product was finally washed with ethanol and dried to give 0.64 g (27%) of the title compound as a hydrochloride. M.p. 259°-263° C. 1H-NMR (DMSO-d6, δ): 2.65-3.15 (m, 8H), 4.7 (s, 1H), 7.17 (t, 1H), 7.34 (t, 1H), 7.45 (d, 1H), 7.57 (d, 1H), 8.93 (s, 2H), 11.8 (s, 1H), 12.3 (s, 1H).

Provenance & Evidence