Methyl iodide → (2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-(4'-(dimethylamino)-2'-vinylbiphenyl-4-yl)-4-methoxypyrrolidine-1,2-dicarboxylate

Participants

Reaction Steps

NaH (60% in oil) (46 mg, 1.163 mmol) was added to a solution of (2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-(4′-(dimethylamino)-2′-vinylbiphenyl-4-yl)-4-hydroxypyrrolidine-1,2-dicarboxylate (330 mg, 0.646 mmol) and methyl iodide (0.073 mL, 1.163 mmol) at 0° C. in DMF and stirred at this temperature and allowed to warm up to r.t. overnight. The reaction was then quenched with saturated NH4Cl solution and ether. The ether layer was washed with brine, dried, filtered and evaporated to give crude material. The crude material was purified by flash chromatography on the Biotage (5-45% EtOAc in hexanes) to give the semi purified (2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-(4′-(dimethylamino)-2′-vinylbiphenyl-4-yl)-4-methoxypyrrolidine-1,2-dicarboxylate (231 mg, 0.440 mmol, 68% yield) as a clear oil. LCMS: rt=1.86 min. [M+H]+=525; Phenomenex-Luna C-18 (5μ) (3.0×50 mm); Solvent A=10% acetonitrile—90% water—0.1% TFA, Solvent B=90% acetonitrile—10% water—0.1% TFA; gradient 0% to 100% solvent B over 2 min. and then hold for 1 min.; 4 mL/min; inj. vol.=5 uL; wavelength=220.

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