反应详情

[3-(2-Formyl-4-nitro-phenoxy)-5-trifluoromethyl-phenyl]acetic acid ethyl ester was reduced to [3-(2-hydroxymethyl-4-nitro-phenoxy)-5-trifluoromethyl-phenyl]-acetic acid ethyl ester according to the procedure described in Example 21, Step 6 and then brominated as described in Example 21, Step 7 and then treated with 2,2,2-trifluoroethanethiol to give {3-[4-Nitro-2-(2,2,2-trifluoro-ethylsulfanylmethyl)-phenoxy]-5-trifluoromethyl-phenyl}-acetic acid ethyl ester. The amine was reduced as described in Example 21, Step 9, and then treated with pivaloyl chloride as described in Example 21, Step 10 to provide {3-[4-(2,2-Dimethyl-propionylamino)-2-(2,2,2-trifluoro-ethylsulfanylmethyl)-phenoxy]-5-trifluoromethyl-phenyl}-acetic acid ethyl ester. Hydrolysis of the ester as described in Example 21, Step 11 provided the acid.