Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl ester → 3-(Ethoxycarbonylmethyl)-7-[(4,6-dimethoxy-pyrimidin-2-yl)oxy]-phthalide

Beteiligte Stoffe

Reaktionsschritte

A mixture of 1.5 g of 7-[(4,6-dimethoxy-pyrimidin-2-yl)oxy] -3-hydroxy-phthalide (see Example 84) and 2.5 g of (ethoxycarbonylmethylene)-triphenyl-phosphorane is maintained at reflux temperature for 10 hours in approximately 40 ml of tetrahydrofuran. The solvent is then evaporated off and the reaction material which remains is purified on a column of silica gel (eluant: ethyl acetate/n-hexane 1:1) to yield 3-(ethoxycarbonylmethyl)-7[(4,6-dimethoxy-pyrimidin-2-yl)oxy]-phthalide, m.p. 150°-152° C.

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