Methyl iodide → tert-Butyl (8-methyl-2,7-dioxo-5,6,7,8-tetrahydro-4H-imidazo[1,5,4-fg][1,6]-benzodiazocin-1(2H)-yl)acetate

Participants

Reaction Steps

Cesium carbonate (214 mg, 0.66 mmol) and iodomethane (93 mg, 0.66 mmol) were added to a solution of tert-butyl (2,7-dioxo-5,6,7,8-tetrahydro-4H-imidazo[1,5,4-fg][1,6]benzodiazocin-1 (2H)-yl)acetate (109 mg, 0.33 mmol, described in Intermediate 27) in DMF (5 mL). After 18 h, the mixture was purified directly by HPLC using a reversed phase C18 column and eluting with a gradient of H2O:CH3CN:CF3CO2H—90:10:0.1 to 5:95:0.1. Lyophilization provided the title compound. MS: m/z=346 (M+1).

Provenance & Evidence