5-Bromomethyl-2-furancarboxylic acid ethyl ester → (+/-)-5-[[5-{2-Ethyl-8-methyl-5H-dibenzo[a,d]cyclohepten-5-yl}-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl]methyl]-2-furancarboxylic acid, ethyl ester

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The subtitle compound was prepared from the product of step (vi) (0.6 g) and 5-bromomethyl-2-furancarboxylic acid ethyl ester (J. Chem. Soc. Perkin Trans. 1, 1981, 1125, Bull. Chem. Soc. Jpn. 1987, 60, 1807)(0.47 g) according to the method of example 1 step (iv). Purification was by chromatography eluting with 50% ethyl acetate in isohexane. Yield 0.19 g.

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