Tributyltin fluoride → Methyl 2-(2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepin-9-yl)acetate

Participants

Reaction Conditions

Reaction Steps

A mixture of 194 mg (0.500 mmol) of 9-bromo-2-(1-isopropyl-3-methyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine 411, 0.436 mL (2.00 mmol) of 1-(tert-butyldimethylsilyloxy)-1-methoxyethene, 19.6 mg (0.025 mmol) of dichlorobis(tri-o-tolylphosphine)palladium(II) (19.6 mg, 0.0250 mmol) and 309 mg (1.00 mmol) of tributyltin fluoride (309 mg, 1.00 mmol) in 3.0 ml of tetrahydrofuran was degassed and then heated for 18 hours at 80° C. The mixture was filtered through Celite, the filtrate mixed with 10 ml of water, the mixture was acidified to pH2 and extracted with ethyl acetate. The organic phases were combined, dried with MgSO4 and concentrated. The residue was purified by flash chromatography (0-5% gradient of methanol in dichloromethane) to afford 98 mg of Methyl 2-(2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepin-9-yl)acetate (51%). M/z 382.2. calc. 381.18.

Provenance & Evidence