Copper-Catalyzed Tandem O-Arylation–Oxidative Cross Coupling: Synthesis of Chromone Fused Pyrazoles
摘要:
Intermolecular tandem copper-catalyzed O-arylation-oxidative acylation (cross dehydrogenative coupling-CDC) has been developed under air as an oxidant. The reaction between 2,4-dihydro-3H-pyrazol-3-ones and ortho-halo aryl carboxaldehydes furnished the corresponding chromone fused pyrazoles, in a straightforward manner. The synthetic utility of the presented tandem catalysis has been demonstrated with the synthesis of an A(2)-subtype selective adenosine receptor antagonist in only two steps.[GRAPHICS]
[EN] POLYCYCLIC DERIVATIVES TARGETING RAL GTPASES AND THEIR THERAPEUTICAL APPLICATIONS [FR] DÉRIVÉS POLYCYCLIQUES CIBLANT DES GTPASES RAL ET LEURS APPLICATIONS THÉRAPEUTIQUES
Metal-free direct construction of sulfenylated pyrazoles via the NaOH promoted sulfenylation of pyrazolones with aryl thiols
作者:Xiaoxia Liu、Huanhuan Cui、Daoshan Yang、Shicui Dai、Tiantian Zhang、Jingyu Sun、Wei Wei、Hua Wang
DOI:10.1039/c6ra09739a
日期:——
A convenient and cost-effective NaOH-promoted direct sulfenylation of pyrazolones with aryl thiols has been developed under mild and metal-free conditions.
Compounds of formula (I)
1
or therapeutically acceptable salts thereof, are useful for treating bacterial infections. Preparation of the compounds, compositions containing the compounds, and treatment of diseases using the compounds are disclosed.
A filter for a display device, which comprises a dipyrazolylsquarylium dye represented by formula:
wherein A and B each independently represent a substituted or unsubstituted pyrazolyl group. The filter is excellent in resistance to heat and light and gives no adverse influences on luminescence of the three primary colors, red, green and blue.
一种用于显示设备的滤光片,它包括由式表示的二吡唑鎓染料:
其中 A 和 B 各自独立地代表一个取代或未取代的吡唑基团。该滤光片具有优异的耐热性和耐光性,对红、绿、蓝三原色的发光无不良影响。
Zur Darstellung von 5-Isopropyl- und 5-tert. Butyl-2H-pyrazol-3-onen Synthesis of 5-Isopropyl- and 5-tert. Butyl-2H-pyrazol-3-ones
作者:Hubert Friedmann、Wolfram Hänsel
DOI:10.1002/ardp.19833160816
日期:——
FRIEDMANN, H.;HAENSEL, W., ARCH. PHARM., 1983, 316, N 8, 726-727