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The product 2 was prepared by the addition of piperazine (C4H10N2) to 1  according to the reported procedure .[...]
To a solution of hydrazonoyl bromide (5.70 g, 0.02 mol) 2 and 1  (3.18 g, 0.01 mol) in tetrahydrofuran (60 ml) was added triethylamine (2.02 g, 0.02 mol in 10 ml of THF).[...]
The compound 3, which exists in tautomeric equilibria between enamine (form A) and methylene imine (form B), was prepared by addition of ethoxycarbonylmethyl chloride 2 (1.23g, 0.01 mol) to a solution of 3-(ethoxycarbonylmethylene)-2-oxo quinoxaline, 1  (2.32 g, 0.01 mol) in 60 ml DMF, K2CO3...
The product 2 was prepared by the addition of benzylamine (C6H5CH2NH2) to 1  according to the reported procedure .[...]
As part of research programme directed to the synthesis of novel heterocyclic compounds pharmacologically interesting  via ring transformation of 1,2,4-triazine derivatives, we synthesized the title compounds 3 via two step process.[...]
4-(4-(dimethylamino)phenyl)-5-acetyl-6-phenyl-3,4-dihydropyrimidin-2(1H)-thione was prepared from benzoxyacetone (1) (1.62 g, 10 mmol), N,N-dimethylaniline (2) (1.21 g, 10 mmol) and thiourea (3) (1.140 g, 15 mmol) in dichloromethane (15 mL) as solvent using KF/Al2O3 (5 g) as a catalysis.[...]
In 1882, Hantzsch reported the first synthesis of dialkyl 1,4-dihydro-2,6-dimethylpyridine-3,5-dicarboxylates from a refluxing mixture of an aldehyde, a β-ketoester, and aqueous ammonium hydroxide in ethanol.[...]
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