Hydrazine hydrate (1:1) → 9-(2,5-dimethyl-1H-pyrrol-1-yl)-1-methyl-5,6-dihydro-1H-[1,2,4]triazino[4,3-a]quinolin-2(3H)-one

Participants

Reaction Steps

To a solution of ethyl 2-(7-(2,5-dimethyl-1H-pyrrol-1-yl)-2-thioxo-3,4-dihydroquinolin-1(2H)-yl)propanoate (0.2 g, 0.561 mmol) in EtOH (10 mL) was added hydrazine hydrate (6 mL) and the solution was heated to reflux overnight. The reaction mixture was cooled to ambient temperature and the solvent was removed in vacuo. Water (10 mL) was added to the residue and the mixture was extracted with EtOAc (2×30 mL). The combined organic layer was dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel (eluting with 30-50% EtOAc in petroleum ether) to give 9-(2,5-dimethyl-1H-pyrrol-1-yl)-1-methyl-5,6-dihydro-1H-[1,2,4]-triazino[4,3-a]quinolin-2(3H)-one (0.14 g, 81%). 1H NMR (CDCl3, 400 MHz): δ 8.04 (brs, 1H), 7.21 (d, J=8.0 Hz, 1H), 6.82 (d, J=8.0 Hz, 1H), 6.73 (s, 1H), 5.89 (s, 2H), 4.56 (q, J=6.8 Hz, 1H), 2.93 (m, 2H), 2.63 (m, 2H), 2.05 (s, 6H), 1.42 (d, J=6.8 Hz, 3H).

Provenance & Evidence