Water → 11beta-Methoxy-3-triethylsilyloxy-estra-1,3,5(10),16-tetraene

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Reaction Steps

284 mg (1 mmol) of 11β-methoxy-estra-1,3,5(10),16-tetraen-3-ol is reacted in 10 ml of tert-butylmethyl ether and 1 ml of pyridine with 0.6 ml of triethylbromosilane. After 1 hour, 30 ml of water is added to the reaction suspension. The organic phase is separated, washed, dried and concentrated by evaporation in a vacuum. The oily product that is thus obtained is used immediately in the next stage (hydroboration). Yield: 380 mg (95% of theory)

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