Cyanogen Bromide → HCID 59467889, compound

Participants

Reaction Steps

To a suspension of compound 83 (340 g, 1.05 mmol) in dry CH3CN (10 mL) were added cyanogen bromide (5M in CH3CN) (0.42 mL, 2.1 mmol) and K2CO3 (580 g, 4.2 mmol). The reaction was heated to reflux for 4 h under N2. 0.84 mL (4.2 mmol) of cyanogen bromide was added and the reflux was continued for 12 h. The reaction mixture was diluted with EtOAc (50 mL). The solids were filtered off, filtrate was concentrated, and the yellow residue was purified by column chromatography (20% EtOAc in hexanes) to afford 84 as an off-white solid (80 mg, 28%). MS m/z: 349 (M+H)+. Anal. Calcd. For, C19H16N4OS.0.6 H2O: C, 63.53; H, 4.83; N, 15.60; S, 8.92. Found: C, 63.24; H, 4.67; N, 15.25; S, 8.76.

Provenance & Evidence