Magnesium → (2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-hydroxy-4-(2-vinylbiphenyl-4-yl)pyrrolidine-1,2-dicarboxylate

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Reaction Steps

(2-vinylbiphenyl-4-yl)magnesium bromide (2.66 g, 9.38 mmol) solution, made by refluxing Intermediate 7 with 1 eq. of magnesium turnings in THF, was added to a solution of (S)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-oxopyrrolidine-1,2-dicarboxylate (2.7 g, 9.38 mmol) in toluene (75 mL) at 0° C. and stirred for 1 hr and then quenched with sat. NH4Cl solution. The aqueous layer was extracted with DCM and the combined organics were dried, filtered and evaporated to give crude material. The crude material was purified by flash chromatography on the Biotage (20-33% EtOAc:Hex) to give (2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-hydroxy-4-(2-vinylbiphenyl-4-yl)pyrrolidine-1,2-dicarboxylate (800 mg, 1.711 mmol, 18% yield). LCMS: rt=1.85 min. [M+Na]+=490; 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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