Benzyl ((2R,3S)-2-(3,3-dibromoallyl)-1-(2,4-dimethoxybenzyl)-4-oxoazetidin-3-yl)(4-methoxybenzyl)carbamate → Benzyl ((3S,4R)-1-(2,4-dimethoxybenzyl)-2-oxo-4-(prop-2-yn-1-yl)azetidin-3-yl)(4-methoxybenzyl)carbamate

Participants

Reaction Steps

tert-Butyllithium (0.291 mL, 0.494 mmol) was added to the solution of benzyl ((2R,3S)-2-(3,3-dibromoallyl)-1-(2,4-dimethoxybenzyl)-4-oxoazetidin-3-yl)(4-methoxybenzyl)carbamate (162 mg, 0.235 mmol) in THF (Volume: 3.4 mL) at −78° C. After 15 min, the reaction mixture was quenched with NH4Cl, and diluted with water and EtOAc. The layers were separated, and the organic layer was extracted with EtOAc (2×). Combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified via silica gel chromatography (EtOAc-Hept, 0-40%) to afford the title compound (98 mg, 79%). LCMS: Rt=1.08 min, m/z=529.3 (M+1) Method 2m_acidic.

Provenance & Evidence