Sodium hydride → ethyl (RS)-4-(2-methoxycarbonyl-5-benzyloxyphenoxy)-4-phenylbutanoate

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반응 단계

A stirred suspension of sodium hydride (340 mg) in dry dimethylformamide (100 mL) is treated portionwise with methyl 4-benzyloxy-2-hydroxybenzoate (2 g). After stirring at ambient temperature for 30 minutes, it is treated with ethyl (RS)-4-chloro-4-phenylbutanoate (1.9 g) in one portion and stirred for 16 hours at ambient temperature, and then for two hours at 80° C. The reaction mixture is then concentrated in vacuo and the residue is partitioned between ethyl acetate (100 mL) and water (100 mL). The organic layer is dried over magnesium sulphate, filtered and concentrated in vacuo. Flash chromatography of the resulting oil, eluting with 5-10% ethyl acetate/cyclohexane, affords ethyl (RS)-4-(2-methoxycarbonyl-5-benzyloxyphenoxy)-4-phenylbutanoate (2 g), in the form of a yellow oil.

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