Disclosed is a process for preparing substituted pyridone compounds which comprises (a) admixing in the absence of a solvent (1) an amine of the formula R
1
—NH
2
wherein R
1
is an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, and (2) a first ester of the formula
1
wherein R
2
is an electron withdrawing group and R
3
is an alkyl group; (b) heating the mixture containing the amine and the first ester to form an intermediate compound of the formula
2
(c) admixing the intermediate compound with (1) a base and (2) a second ester of the formula
3
wherein R
4
is an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group and R
5
is an alkyl group, said second ester being present in a molar excess relative to the intermediate compound, said base being present in a molar excess relative to the intermediate compound, and (d) heating the mixture containing the intermediate compound, the second ester, and the base to form a pyridone compound of the formula
4
or a salt thereof. Also disclosed is a process for preparing diazopyridone colorants which comprises preparing a pyridone compound by the above process and reacting the pyridone compound with a diazonium salt to form a diazopyridone compound.
本发明公开了一种制备取代
吡啶酮化合物的方法,其包括(a)在无溶剂的情况下混合(1)式为R1-NH2的胺,其中R1为烷基,芳基,芳基烷基或烷基芳基基团,以及(2)式为1的第一酯,其中R2为电子提取基团,R3为烷基;(b)加热含有胺和第一酯的混合物,以形成式为2的中间化合物;(c)混合中间化合物与(1)碱和(2)式为3的第二酯,其中R4为烷基,芳基,芳基烷基或烷基芳基基团,R5为烷基,所述第二酯相对于中间化合物存在摩尔过量,碱相对于中间化合物存在摩尔过量;(d)加热含有中间化合物,第二酯和碱的混合物,以形成式为4的
吡啶酮化合物或其盐。本发明还公开了一种制备重氮
吡啶酮
染料的方法,其包括通过上述方法制备
吡啶酮化合物,并将
吡啶酮化合物与重氮盐反应,以形成重氮
吡啶酮化合物。