Reaction of 2,3-dichloro-5,6-dicyanopyrazine with enamines and some tertiary amines
作者:Dongfeng Hou、Atsushi Oshida、Masaru Matsuoka
DOI:10.1002/jhet.5570300620
日期:1993.12
The reaction of 2,3-dichloro-5,6-dicyanopyrazine (1) with enamines as well as a few tertiaryamines as enamine precursors was investigated. Both reactions gave aminovinyl-substituted pyrazine derivatives. During the attempted purification of 3c or 3d by column chromatography on silica gel, 2-chloro-5,6-dicyano-3-(1′-oxocyclopent-2′-yl)pyrazine (4) was obtained, apparently by hydrolytic cleavage. The