1 H-吡唑并[3,4- b ]喹喔啉的区域特异性合成新方法–有机光电器件的潜在材料,以及对旧方案的修订
摘要:
使用一种新的合成途径制备了一系列6-取代的1,3-二苯基-1H-吡唑并[3,4- b ]喹喔啉:将适当的5-(邻硝基苯基)-吡唑与草酸亚铁或三苯基膦。该方法的主要优点是,与吡唑并[3,4- b ]喹喔啉合成的旧方案相反,该方法允许将取代基引入碳环而不形成异构体。吡唑环也可以进行一定程度的修饰。此外,我们提出了一种新的机制,据报道,邻苯二酚之间的缩合反应可用于最古老的吡唑并[3,4- b ]喹喔啉合成。-苯二胺和3,4-吡唑啉-5-二酮。
Cosmetic compositions based on 4,5-pyrazolinediones, novel 4,5-pyrazolinediones, process for their preparation and uses thereof
申请人:L'Oreal SA
公开号:US20020031536A1
公开(公告)日:2002-03-14
The present invention relates to novel cosmetic compositions, in particular for coloring the skin and/or the hair, comprising, in a cosmetically acceptable support, at least one 4,5-pyrazolinedione. The invention also relates to novel 4,5-pyrazolinediones, to processes for their preparation and to their uses in the cosmetics field.
Access to Spiropyrazolone-butenolides through NHC-Catalyzed [3 + 2]-Asymmetric Annulation of 3-Bromoenals and 1<i>H</i>-Pyrazol-4,5-diones
作者:Marta Gil-Ordóñez、Alicia Maestro、José M. Andrés
DOI:10.1021/acs.joc.3c00188
日期:2023.6.2
stereoselective synthesis of spirocyclic pyrazolin-5-ones by N-heterocyclic carbene (NHC) organocatalysis has been less studied so far. For this reason and considering the interest of this class of compounds, here, we present the NHC-catalyzed [3 + 2]-asymmetric annulation of β-bromoenals and 1H-pyrazol-4,5-diones that achieves to produce chiral spiropyrazolone-butenolides. The synthesis is general for
COMPOSITION FOR DYEING KERATIN FIBRES,COMPRISING A PYRAZOLIN-4,5-DIONE AND AN AROMATIC PRIMARY AMINE
申请人:——
公开号:US20020040508A1
公开(公告)日:2002-04-11
The invention concerns a composition for dyeing keratin fibres, in particular human keratin fibres such as hair comprising at least one pyrazolin-4,5-dione of formula (I) and at least one aromatic primary amine. Said composition enables R the dyeing of keratin fibres without an oxidising agent in shades which are strong, varied, resistant and less selective than those of prior art. The invention also concerns dyeing methods and devices using said composition.
Composition for dyeing keratin fibres, comprising a pyrazoline-4, 5-dione and an aromatic primary amine
申请人:L'OREAL S.A.
公开号:US20020194685A1
公开(公告)日:2002-12-26
The invention concerns a composition for dyeing keratin fibres, in particular human keratin fibres such as hair comprising at least one pyrazolin-4,5-dione of formula (I) and at least one aromatic primary amine. Said composition enables the dyeing of keratin fibres without an oxidising agent in shades which are strong, varied, resistant and less selective than those of prior art. The invention also concerns dyeing methods and devices using said composition.
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