反应详情

A method for preparing compounds which are derivatives of 3-amino-4-trifluoromethyl-2-pyridinone is illustrated in Scheme 3. In Step A, 1,1,1, trifluoro-2,4-pentanedione is condensed with nitroacetamide in ethanolic diethylamine to give 2-hydroxy-6-methyl-3-nitro-4-trifluoromethylpyridine. This is alkylated in Step B with an acetate equivalent such as t-butyl bromoacetate in THF using sodium hydride as a base and the nitro group is reduced in Step C by hydrogenation using a catalyst such as palladium on carbon. The t-butyl group is removed in Step D by a strong acid such as HCl and the resulting carboxylic acid is coupled to ethyl-2-aminomethyl-4-chlorophenoxyacetamide in Step E to give the final product.

1. customA method for preparing compounds which