H. Kim, Kyung-Ok Choi, Woo-Sung Lim
Jun 20, 2003
Citations
0
Influential Citations
9
Citations
Journal
Journal of The Korean Chemical Society
Abstract
The reaction of 6-chloro-3-methoxycarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline( 5) or 3- methoxycarbonylmethylene-6-nitro-2-oxo-1,2,3,4-tetrahydroquinoxaline( 6) with hydrazine hydrate gave 3-hydrazinocar- bonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxalines(7, 8). The reaction of compound 7 or 8 with substituted ben- zaldehydes or heteroaromatic aldehydes afforded quinoxalines( 9-14). Compounds showed the tautomerism between the enamine and methylene imine forms, and between the enamine, methylene imine and enaminol forms in dimethyl sul- foxide solution. The tautomer ratios were determined by the 1 H NMR.