Dichloromethane → (S)alpha-cyano-3-phenoxy-benzyl (1R,cis) 2,2-dimethyl-3-(2,2,2-trichloroethoxycarbonylethynyl)-cyclopropane-carboxylate

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반응 단계

6.2 g of dicyclohexylcarbodiimide were added to a mixture of 9.5 g of the product of Step B, 30 ml of methylene chloride and 3 ml of pyridine and after stirring for 30 minutes, 6.8 g of (S)α-cyano-3-phenoxy-benzyl alcohol were added to the mixture. The mixture was stirred for 90 minutes and was filtered and the filtrate was washed with N hydrochloric acid and then with water until the wash water was neutral, dried and evaporated to dryness. The 16.3 g of oil residue were chromatographed over silica gel and eluted with a 97-3 benzene-ethyl acetate mixture to obtain 12 g of (S)α-cyano-3-phenoxy-benzyl(1R,cis)2,2-dimethyl-3-(2,2,2-trichloroethoxycarbonyl-ethynyl]-cyclopropane-carboxylate melting at 101° C.

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