Preparation of 2,4,5-trisubstituted pyrazolo[4,3-c]quinolin-3-ones
摘要:
The preparation of pyrazolo[4,3-c]quinolinones is reported starting from 2-substituted-5-(2-fluorophenyl)-3-oxo-2,4-dihydro-3H-pyrazol-3-ones. A one-pot protocol was developed, in which condensation with an orthoamide, followed by substitution with a primary amine and subsequent S(N)Ar-cyclization, to provide rapid access to 4- and 5-substituted pyrazolo[4,3-c]quinolinones. (C) 2009 Elsevier Ltd. All rights reserved.
作者:Douglas C. Beshore、Adam W. Johnson、Robert M. DiPardo、Daniel R. Pitts、Victoria Cofre、Scott D. Kuduk
DOI:10.1002/jhet.2744
日期:2017.3
s, followed by a ring‐closing intramolecular SNAr tactic and direct reaction of 5‐(2‐fluorophenyl)‐2,4‐dihydro‐3H‐pyrazol‐3‐ones with aryl diazonium salts, followed by cyclization. The strategies described herein provide practical and generalmethods to prepare 2,5‐disubstituted pyrazolo[4,3‐c]cinnolin‐3‐ones.
本文报道了对2,5-二取代吡唑并[4,3 - c ]肉桂醇-3-酮的补充策略,提供了在2-或5-位的晚期取代基引入。用取代的肼处理现成的4-硫代锡啉酯可以在后期进入2位,而在5位引入后期取代基则通过两种不同的策略来实现:4-肼基吡唑-3-酮的烷基化,然后分子内S N Ar的闭环反应和5-(2-氟苯基)-2,4-二氢-3 H-吡唑-3-酮与芳基重氮盐的直接反应,然后环化。本文描述的策略为制备2,5-二取代的吡唑并[4,3- c]提供了实用且通用的方法] cinnolin-3-ones。
Enantioselective Formal C(sp<sup>3</sup>
)−H Bond Activation in the Synthesis of Bioactive Spiropyrazolone Derivatives
作者:Houhua Li、Rajesh Gontla、Jana Flegel、Christian Merten、Slava Ziegler、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201811041
日期:2019.1.2
Herein, we report the first enantioselective annulation of α‐arylidene pyrazolones through a formalC(sp3)−Hactivation under mild conditions enabled by highly variable RhIII‐Cpx catalysts. The method has a wide substrate scope and proceeds with good to excellent yields and enantioselectivities. Its synthetic utility was demonstrated by the late‐stage functionalization of drugs and natural products
C6′ steric bulk of cinchona alkaloid enables an enantioselective Michael addition/annulation sequence toward pyranopyrazoles
作者:Xiaoze Bao、Shiqiang Wei、Jingping Qu、Baomin Wang
DOI:10.1039/c8cc00154e
日期:——
A C6′ silyloxyl quinine catalyzed asymmetric Michael addition/annulation cascade between pyrazolones and enynones was developed.
开发了一种由C6'硅氧基喹啉催化的吡唑酮和烯炔酮之间的不对称Michael加成/环化级联反应。
An Organocatalytic Asymmetric Friedel–Crafts Addition/Fluorination Sequence: Construction of Oxindole–Pyrazolone Conjugates Bearing Vicinal Tetrasubstituted Stereocenters
作者:Xiaoze Bao、Baomin Wang、Longchen Cui、Guodong Zhu、Yuli He、Jingping Qu、Yuming Song
DOI:10.1021/acs.orglett.5b02470
日期:2015.11.6
A highly efficient and practical one-pot sequential process, consisting of an organocatalytic enantioselective Friedel–Crafts-type addition of 4-nonsubstituted pyrazolones to isatin-derived N-Boc ketimines and a subsequent diastereoselective fluorination of the pyrazolone moiety, is developed. This reaction sequence delivers novel oxindole–pyrazolone adducts featuring vicinal tetrasubstituted stereocenters
The present invention is directed to quinolinone-pyrazolone compounds of formula (I) which are M1 receptor positive allosteric modulators and that are useful in the treatment of diseases in which the M1 receptor is involved, such as Alzheimer's disease, schizophrenia, pain or sleep disorders. The invention is also directed to pharmaceutical compositions comprising the compounds, and to the use of the compounds and compositions in the treatment of diseases mediated by the M1 receptor.