Bromide ion → HCID 58204577, compound

Participants

Reaction Conditions

Reaction Steps

A degassed mixture of 374 mg, (1.00 mmol) of 9-bromo-2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine 194, 342.5 mg, (2.000 mmol) of L-Proline tert-Butyl Ester, 26 mg, (0.050 mmol) of Bis(tri-t-butylphosphine)palladium and 192 mg, (2.00 mmol) of Sodium tert-butoxide in Toluene (10.0 mL, 93.9 mmol) was heated at 95° C. for 24 hours. The same quantity of L-Proline tert-Butyl Ester, Sodium tert-butoxide and the catalyst were added and the mixture was heated for 6 hours at 115° C. until no starting bromide remains in the reaction mixture. The mixture was concentrated in vacuum, the residue distributed between ethyl acetate and 5% aqueous citric acid. The organic extracts were washed with water, sat. NaHCO3, water, brine, dried over MgSO4 and purified on a silicagel 12 g column eluting with 4% Methanol in DCM to give (S)-tert-butyl 1-(2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepin-9-yl)pyrrolidine-2-carboxylate. Yield 153 mg (55-60% purity, the product is contaminated with debromination byproduct). M/z 465.2, calc. 464.25

Provenance & Evidence