Iodine → HCID 86701038, compound

Participants

Reaction Steps

To s solution of PPh3 (5.2 g, 20.0 mmol) in dry DCM (60 mL) was added I2 (5.1 g, 20.0 mmol). After I2 was dissolved completely, TEA (7.0 mL, 50.0 mmol) was added quickly at rt. The mixture was stirred for 15 mins. Tert-butyl 1-(2-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinyl)-2-oxoethyl)cyclopropyl-carbamate (4.9 g, 10.0 mmol) was added and the mixture was stirred at rt for 1 hr. The solvent was concentrated. EtOAc (250 mL) was added, and the solution was filtered to remove PPh3O. The filtrate was concentrated and the residue was purified by silica gel column chromatography (0˜60% gradient elution EtOAc/petroleum ether) to afford tert-butyl 1-((5-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octan-2-yl)-1,3,4-oxadiazol-2-yl)methyl)cyclopropyl-carbamate (4.1 g, 87%) as a white solid. ESI-MS (EI+, m/z): 470 [M+H]+.

Provenance & Evidence