反应详情

3-Hydroxy-5-phenylpyrazine-2-carboxamide is prepared by the method of Dick, Wood and Logan, J. Chem. Soc., 2131 (1956). The carboxamide is converted to 6-phenylpyrazinol by the method of Jezo and Luzak, Chem. Zvest., 22, 190 (1968), using 80 percent sulfuric acid at 180° C. Using the procedure of Example III and replacing 5-phenylpyrazinol with an equivalent amount of 6-phenylpyrazinol, the product obtained is 2-chloro-6-phenylpyrazine. Using the procedure of Example V and replacing 2-chloro-5-phenylpyrazine with an equivalent amount of 2-chloro-6-phenylpyrazine, the product obtained is diethyl α-methyl-6-phenylpyrazinylmalonate. Using the procedure of Example VI and replacing diethyl α-methyl-5-phenylpyrazinylmalonate with an equivalent amount of diethyl α-methyl-6-phenylpyrazinylmalonate, the product obtained is ethyl α-methyl-6-phenylpyrazineacetate. Using the procedure of Example IX and replacing ethyl α-methyl-5-phenylpyrazineacetate with an equivalent amount of ethyl α-methyl-6-phenylpyrazineacetate, the product obtained is α-methyl-6-phenylpyrazineacetic acid. Using the procedure of Example XI and replacing ethyl α-methyl-5 -phenylpyrazineacetate with an equivalent amount of ethyl α-methyl-6-phenylpyrazineacetate, the product obtained is α-methyl-6-phenylpyrazineacetamide.

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