Triethylamine → [(R)-1-(5-bromo-2-fluoro-phenyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-(4-methoxy-benzyl)-amine

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Reaction Steps

A solution of (R)-2-(5-bromo-2-fluoro-phenyl)-2-(4-methoxy-benzylamino)-propan-1-ol (6.95 g, 18.9 mmol) in dichloromethane (170 ml) was treated at room temperature with triethylamine (5.78 ml, 41.5 mmol), 4-dimethylaminopyridine (1.15 g, 9.43 mmol), and tert-butyldimethylchlorosilane (1.15 g, 37.7 mmol). After 16 hours at room temperature the reaction mixture was consecutively extracted with saturated sodium hydrogen carbonate solution (100 ml), water (100 ml), and brine (100 ml). The aqueous layers were re-extracted with dichloromethane (100 ml). The combined organic layers were dried over sodium sulfate and evaporated at reduced pressure. After chromatography on Silicycle-Si-amine column using heptane as the eluent, [(R)-1-(5-bromo-2-fluoro-phenyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-(4-methoxy-benzyl)-amine (intermediate C8A) was obtained as a colourless oil (8.0 g, 88% of theory). MS (ISP): m/z=482.2, 484.3 [M+H]+.

Provenance & Evidence