Tetrahydrofuran → (R)-2-Methyl-propane-2-sulfinic acid [(R)-1-(4-chloro-3,5-dimethyl-phenyl)-2-methyl-propyl]-amide

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Reaction Steps

In a separate flask a solution of imine INT 36 (5 g, 18.4 mmol) in THF (140 mL) was cooled in a dry ice bath under argon to −78° C. At this temperature the organozincate solution from above was added dropwise over a period of about 30 minutes. Stirring was continued for another hour before the resulting mixture was first quenched carefully with 10% ammonium chloride solution (40 mL), then water (50 mL). The reaction mixture was allowed to warm up to room temperature and was then extracted with Et2O (3×). The organic layers were washed with water and brine, dried over sodium sulfate, filtered and concentrated. The crude was purified by chromatography on silica gel (cyclohexane/EtOAc).

Provenance & Evidence