专利号:US-5663366-A 优先权日:1992-10-16 标 题:Process for the synthesis of 4,5-diaminopyrazole derivatives useful for dyeing hair 发明人:NEUNHOEFFER HANS; GERSTUNG STEFAN; CLAUSEN THOMAS; BALZER WOLFGANG R 权利人:WELLA AKTIENGESELLSCHAT 摘要:The subject matter of the present invention is directed to a process for producing 4,5-diaminopyrazole derivatives of the general formula (I) (I) where R1 and R2 independently designate hydrogen, a C1- to C6-alkyl radical or a C2- to C4-hydroxyalkyl radical, which can be used as dye precursors, for example for hair dyes, and to new pyrazole derivatives. When using the process according to the invention good yields of isomer-pure 4,5-diaminopyrazole derivatives of general formula (I) can be obtained.
专利号:US-5534267-A 优先权日:1992-10-16 标题 :Composition for the oxidative dyeing of hair containing 4,5-diaminopyrazole derivatives as well as new 4,5-diaminopyrazole derivatives and process for their synthesis 发明人:NEUNHOEFFER HANS; GERSTUNG STEFAN; CLAUSEN THOMAS; BALZER WOLFGANG R 权利人:WELLA AG 摘要:The composition for oxidative dyeing of hair based on a combination of developer substances and coupler substances, contains as a developer substance 4,5-diamino-1-(4'-methoxybenzyl)pyrazole, 4,5-diamino-1-(4'-methylbenzyl)pyrazole, 4,5-diamino-1-(4'-chlorobenzyl)pyrazole, 4,5-diamino-1-(3'-methoxybenzyl)pyrazole, 4-amino-1-(4'-methoxy-benzyl) -5-methylaminopyrazole or 4-amino-5-(2'-hydroxyethyl)amino-1-(4'-methoxybenzyl)pyrazole.
参考文献:10.1007/s11696-025-03973-1 摘要:Wang X, Chen H, Yan L, Zhang N, Wang R, Xu Y, Zhu J, Zhang J. Pyrazolo[3,4-d]pyrimidin-4-one derivatives bearing an aniline group: design, synthesis and antifungal activity. Chem. Pap. 2025 Feb 28;79(5):2873–82. doi: 10.1007/s11696-025-03973-1.