Cyanogen Bromide → HCID 10198942, compound

Participants

Reaction Steps

A mixture of 2-butyl-1,2,4-thiadiazolo[4,5-a]benzimidazole-3(2H)-one (5.0 g, 20.2 mmole) and cyanogen bromide (4.28 g, 40.4 mmole) in 100 mL of dichloromethane was stirred at room temperature for 26 h. The precipitate was filtered and washed with dichloromethane to yield 4.18 g (81%) of 3-bromo-1,2,4-thiadiazolo[4,5-a]benzimidazole as a white powder: mp 189°-190° C.; 1H NMR (CDCl3) δ8.23 (d, 1H), 7.82 (d, 1H), 7.52 (t, 1H), 7.42 (d, 1H)ppm; 13C NMR (1:1 CDCl3 :DMSO-d6): δ162.78, 149.67, 129.22, 125.53, 122.25, 119.48, 117.25, 111.27 ppm; IR (KBr): ν3025, 2925, 1601, 1493, 1451, 1028, 757, 701 cm-1 ; HRMS calcd for C8H4N3SBr 252.9309, found 252.9307. Anal. Calcd for C8H4N3SBr: C, 37.81; H, 1.59; N, 16.54. Found: C, 37.44; H, 1.33; N, 16.57.

Provenance & Evidence