摘要:
3-[(3-Aminopropyl)amino]-1-oxo-1H-naphtho[2,1-b]pyran-2-carbaldehyde (10) was synthesized by nucleophilic substitution reaction of 2-(3-dimethylamino)-1-oxo-1H-naphtho[2,1-b]pyran-2-carbaldehyde (9) and the monoprotected propane-1,3-diamine. The reaction with the unprotected reagent led to the unexpected 1-(2-hydroxynaphthalen-1-yl)-2-(tetrahydropyrimidin-2(1H)-ylidene)ethanone (6). Extension of this reaction to chromone 16 gave 1-(2-hydroxy-3-isopropyl-6-methylphenyl) -2- (tetrahydropyrimidin-2(1H)-ylidene)ethanone (7). The X-ray crystal structures of 6 and 7 were also determined.