HCID 67833605, compound → HCID 19027066, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 6-ethoxalylaminosulfonyl-7,8,9,10-tetra-hydro-4-hydroxybenzo[f]quinoxaline-2,3(1H,4H)-dion g, 0.5 mmol) in 7 ml of conc. hydrochloric acid was heated to reflux with stirring for 1.5 h. The mixture was cooled to 0° C. and filtered. The isolated product was washed with water and dried to give 0.14 g (66%) of the title compound. M.p. 316° C. decomp. (DSC); IR (KBr): 1698 cm-1 ; 1H-NMR (DMSO-d6): 1.56-1.93 (m, 4H, 2CH2), 2.60-3.27 (m, 4H, 2CH2), 7.37 (broad s, 2H, SO ), 7.92 (s, 1H, ArH), 11.3 (broad s, 1H, NH or OH), ca. 10.7-12.1 (very broad s, 1H, NH or OH), MS m/e: 311 (M , 18%).

Provenance & Evidence