反应详情

温度

50 °C

A mixture of 4-hydroxy-alpha-oxobenzeneacetic acid ethyl ester (0.47 g) and 55% sodium hydride (0.116 g) in dimethylformamide (10 mL) was stirred for 15 minutes and then treated with 4-(3-bromopropoxy)-2-hydroxy-3-propylbenzoic acid methyl ester (0.8 g) in dimethylforrnamide (5 mL). The mixture was heated at 50° C. for 20 hours and worked up as in Example 20. The residual oil was purified by flash chromatography over silica gel (ethyl acetate-hexane; 3:17) and then was crystallized from hexane to give 0.6 g of 4-[3-[3-hydroxy-4-(methoxycarbonyl)-2-propylphenoxy) propoxy]-alpha-oxobenzeneacetic acid ethyl ester, mp 62°-64° C.

1. customThe residual oil was purified by flash chromatography over silica gel (ethyl acetate-hexane; 3:17)
2. customwas crystallized from hexane