申请人:The Hilton-Davis Chemical Co.
公开号:US04595768A1
公开(公告)日:1986-06-17
Process comprises the combination of the three steps of condensing 3-N(R).sub.2 -4-X-benzoic acid with an aromatic or heterocyclic aldehyde, Y-CHO, under acidic conditions to produce 3-Y-5-X-6-N(R).sub.2 phthalide (II), condensing said phthalide with a compound of the formula Z-H under alkaline or acid conditions to produce 2-(.alpha.-Y-.alpha.-Z)methyl-4-X-5-N(R).sub.2 benzoic acid (III), and oxidizing said benzoic acid to produce 3-Y-3-Z-5-X-6-N(R).sub.2 phthalide (I) where: R is hydrogen, non-tertiary alkyl of one to four carbon atoms, benzyl or substituted benzyl; X is hydrogen or halo; Y is 4-R.sup.1 -3-R.sup.2 -2-R.sup.1 -phenyl, 1-R.sup.5 -2-R.sup.6 -5/6-R.sup.4 -3-indolyl, 9-R.sup.7 -3-carbazolyl, 9-julolidinyl, 3,4-dioxymethylenephenyl, 2-thienyl, 1-R.sup.8 -2-pyrrolyl, or 4-pyridinyl; and Z is 4-R.sup.1 -3-R.sup.2 -2-R.sup.1 -phenyl, 1-R.sup.5 -2-R.sup.6 -5/6-R.sup.4 -3-indolyl or 1-R.sup.8 -2-pyrrolyl which are useful as colorless precursor color formers in carbonless duplicating and in thermal marking systems. The intermediates, 3-Y-5-X-6-N(R).sub.2 phthalides (II) and 2-(.alpha.-Y-.alpha.-Z)methyl-4-X-5-N(R).sub.2 benzoic acids (III) also have utility as colorless precursor color formers in carbonless duplicating and thermal marking systems.
该过程包括以下三个步骤的组合:在酸性条件下将3-N(R).sub.2-4-X-苯甲酸与芳香族或杂环醛Y-CHO结合,生成3-Y-5-X-6-N(R).sub.2邻苯二甲酸酐(II);将所述邻苯二甲酸酐与具有Z-H分子式的化合物在碱性或酸性条件下结合,生成2-(.alpha.-Y-.alpha.-Z)甲基-4-X-5-N(R).sub.2苯甲酸(III);将所述苯甲酸氧化,生成3-Y-3-Z-5-X-6-N(R).sub.2邻苯二甲酸酐(I),其中:R为氢、一至四个碳原子的非三级烷基、苄基或取代苄基;X为氢或卤素;Y为4-R.sup.1-3-R.sup.2-2-R.sup.1-苯基、1-R.sup.5-2-R.sup.6-5/6-R.sup.4-3-吲哚基、9-R.sup.7-3-咔唑基、9-茄洛啉基、9-茄洛啉基、3,4-二氧甲基苯基、2-噻吩基、1-R.sup.8-2-吡咯基或4-吡啶基;Z为4-R.sup.1-3-R.sup.2-2-R.sup.1-苯基、1-R.sup.5-2-R.sup.6-5/6-R.sup.4-3-吲哚基或1-R.sup.8-2-吡咯基。这些化合物在无碳复写和热标记系统中作为无色前体色发生剂非常有用。中间体3-Y-5-X-6-N(R).sub.2邻苯二甲酸酐(II)和2-(.alpha.-Y-.alpha.-Z)甲基-4-X-5-N(R).sub.2苯甲酸(III)也可作为无色前体色发生剂在无碳复写和热标记系统中使用。