申请人:Hans Schwarzkopf GmbH & Co. KG
公开号:US05961668A1
公开(公告)日:1999-10-05
Compounds of the formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently of one another may represent a hydrogen atom, a (C.sub.1-4) alkyl group, a hydroxy (C.sub.2-3) alkyl group, an alkoxy (C.sub.2-3) alkyl group, an amino (C.sub.2-3) alkyl group or a 2,3-dihydroxypropyl group and R.sub.5 and R.sub.6 independently of one another may represent hydrogen or a (C.sub.1-4) alkyl group, are made by reacting 2,4-dinitrohalobenzenes with 4-hydroxymethyl-1,3-dioxolanes under alkaline conditions to form 4-(2,4-dinitrophenoxymethyl)-1,3-dioxolanes, which are further reduced to the compounds of formula (I). In an alternate process, the 4-hydroxymethyl-1,3-dioxolanes are reacted with 4-halo-3-nitranilines or 2-halo-5-nitranilines, the product further reacted first under basic conditions with chloroformic acid ester followed by treatment with strong base, alkylation or alkoxylation, reduction, and optionally further alkylation of alkoxylation to arrive at the compounds (I). The compounds are useful as secondary intermediates in oxidative dyeing of keratinous fibers, particularly hair, and can be incorporated into compositions of various forms suitable for dyeing such fibers.
公式(I)的化合物:其中R.sub.1、R.sub.2、R.sub.3和R.sub.4可以独立地表示氢原子、(C.sub.1-4)烷基、羟基(C.sub.2-3)烷基、烷氧基(C.sub.2-3)烷基、氨基(C.sub.2-3)烷基或2,3-二羟基丙基,而R.sub.5和R.sub.6可以独立地表示氢或(C.sub.1-4)烷基,通过将2,4-二硝基卤苯与4-羟甲基-1,3-二氧兰在碱性条件下反应制备公式(I)化合物。在另一个过程中,4-羟甲基-1,3-二氧兰与4-卤代-3-硝基苯胺或2-卤代-5-硝基苯胺反应,产物首先在碱性条件下与氯甲酸酯反应,然后经强碱处理、烷基化或烷氧基化、还原,以及可选地进一步烷基化或烷氧基化,制备公式(I)化合物。这些化合物可作为角蛋白纤维,特别是头发的氧化染色中间体,并可被纳入各种形式的适合染色这些纤维的组合物中。