Methyl iodide → (S)-tert-butyl 1-(tert-butyldimethylsilyloxy)pent-4-en-2-yl(methyl)carbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of (S)-tert-butyl 1-(tert-butyldimethylsilyloxy)pent-4-en-2-ylcarbamate (20 g, 55.0 mmol) and MeI (6.22 mL, 99.7 mmol) in DMF (700 mL) was added sodium hydride (60%, 3.1 g, 77.6 mmol) at 0° C. The reaction was stirred at 0° C. for 2 h then warmed to 10° C. for an additional 2 h at which point LC-MS analysis showed the reaction was complete. The reaction was quenched with saturated aq. NH4Cl solution (800 mL) and EtOAc (2 L). Water was then added to dissolve the solids. The organic layer was washed with water, brine, and dried over Na2SO4. The resulting residue was purified on silica gel column using a mixture of hexanes and EtOAc to give (S)-tert-butyl 1-(tert-butyldimethylsilyloxy)pent-4-en-2-yl(methyl)carbamate (16.9 g, 81%). LRMS (M+H+) m/z 230.2.

Provenance & Evidence