Dichloromethane → 4-[9-(t-Butyldimethylsilyloxy)1-nonynyl]-7-methoxy-3-(4-methoxyphenyl)-3-methylthiochroman

Participants

Reaction Steps

Dichloromethane (30 ml) was added to 4-[9-(t-butyldimethylsilyloxy)-1-nonynyl]-4-hydroxy-7-methoxy-3-(4-methoxyphenyl)-3-methylthiochroman (946 mg, 1.66 mmol) obtained in Example 27, and then zinc iodide (795 mg, 2.49 mmol) and sodium cyanoborohydride (782 mg, 12.45 mmol) were added thereto. The reaction solution was stirred for 24 hours at room temperature and, after adding water, extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified with column chromatography (n-hexane:ethyl acetate=9:1) to obtain 569 mg (yield: 62%, 3RS,4RS/3RS,4SR=5:1) of the title compound as a white solid.

Provenance & Evidence