反应详情

As in Example 15, (2-[4'-fluoro-3-(1-methylethyl)[1,1'-biphenyl]-2-yloxy]ethanol (0.393 g) was treated with 4-hydroxyphenylglyoxylic acid methyl ester (0.258 g) in the presence of diethyl azodicarboxylate (0.298 g) and triphenylphosphine (0.449 g) in tetrahydrofuran (25 mL). The usual work up afforded 0.6 g of crude product which was purified by flash chromatography over silica gel (60 g; ethyl acetate-hexane; 3:7) to furnish 0.3 g of 4-[2-[4'-fluoro-3-(1-methylethyl)[1,1'-biphenyl]-2-yloxy]ethoxy]-alpha-oxobenzeneacetic acid methyl ester. Crystallization of the ester from ethyl acetatehexane yielded the analytical specimen, mp 77°-79° C.

1. customThe usual work up afforded 0.6 g of crude product which
2. customwas purified by flash chromatography over silica gel (60 g; ethyl acetate-hexane; 3:7)