tert-Butyldimethylsilyl chloride → (R,Z)-Methyl 12-(tert-butyldiphenylsilyloxy)octadec-9-enoate

Beteiligte Stoffe

Reaktionsschritte

To a solution of methyl ricinoleate (8.0 g, 32 mmol) in anhydrous pyridine (90 mL) and anhydrous THF (45 mL) was added t-butylchlorodimethyl silane (8.5 mL, 33.3 mmol) and silver nitrate (5.65 g, 33.3 mmol). The solution was stirred at room temperature for 90 minutes under nitrogen. The solution was filtered through celite and the filter cake was rinsed with THF (400 mL). The filtrate was concentrated in vacuo and the residue was dissolved in dichloromethane (300 mL) and washed with 5% HCl (150 mL). The aqueous layer was separated and washed with dichloromethane (2×200 mL). The combined dichloromethane extracts were washed with brine (350 mL), dried on magnesium sulphate, filtered and concentrated in vacuo to dryness. The residue was purified by column chromatography (gradient: 100% hexanes to 10% ethyl acetate in hexanes) to afford the title compound as a colourless oil (13.1 g, 93%).

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