Allyl bromide → HCID 86728109, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl N-tert-butoxycarbonyl-N-[(3S)-3-(fluoromethyl)-3-(2-fluoro-5-nitro-phenyl)-6,6-dimethyl-1,1-dioxo-2H-1,4-thiazin-5-yl]carbamate (2.79 g, 5.10 mmol) in THF (30 mL) at −78° C. under a nitrogen atmosphere was added lithium bis(trimethylsilyl)amide, (7.65 mL, 7.65 mmol, 1M in THF) dropwise. The reaction mixture was stirred at −78° C. for 1 h and then allyl bromide (1.77 mL, 20.41 mmol) was added dropwise. The reaction mixture was stirred at −78° C. for 2 h and quenched by the addition of satd. aqueous NH4Cl at −78° C., then allowed to warm to RT and extracted with EtOAc. The organic extracts were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude mixture was purified by silica gel chromatography on a 80 g RediSep Gold column using a 0-30% EtOAc/hexanes gradient to afford tert-butyl N-[(3S)-2-allyl-3-(fluoromethyl)-3-(2-fluoro-5-nitro-phenyl)-6,6-dimethyl-1,1-dioxo-2H-1,4-thiazin-5-yl]-N-tert-butoxycarbonyl-carbamate (2.0 g, 67%) as an off-white solid and a mixture of cis and trans (2:1) isomers. LC/MS (ESI+) m/z=610 (M+Na).

Provenance & Evidence