Iodine → HCID 86701004, compound

Participants

Reaction Steps

To s solution of PPh3 (2.6 g, 10.0 mmol) in dry DCM (60 mL) was added I2 (2.6 g, 10.0 mmol). After I2 was dissolved completely, TEA (3.5 mL, 25.0 mmol) was added quickly at rt. The mixture was stirred for 15 mins. Tert-butyl 4-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinyl)-4-oxobutylcarbamate (2.4 g, 5.0 mmol) was added. The mixture was stirred at rt for 1 hr. The solvent was concentrated. EtOAc (250 mL) was added, and the solution was filtrated to remove POPh3. The filtrate was concentrated. The resulting residue was purified by silica gel column chromatography (gradient elution 0˜40% EtOAc/petroleum ether) to afford tert-butyl 3-(5-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octan-2-yl)-1,3,4-oxadiazol-2-yl)propylcarbamate (2.0 g, 86%) as a white solid. ESI-MS (EI+, m/z): 458 [M+H]+.

Provenance & Evidence