ortho-Metalation of Unprotected 3-Bromo and 3-Chlorobenzoic Acids with Hindered Lithium Dialkylamides
摘要:
Upon treatment of 3-chloro/bromobenzoic acids with hindered lithium dialkylamides (LDA or LTMP) at -50 degreesC, lithium 3-chloroibromo-2-lithiobenzoates are generated. These dianions can be trapped as such to afford after electrophilic quenching a variety of simple 2-substituted-3-chlorolbromobenzoic acids. The 3-bromo-2-lithiobenzoate is less stable than the corresponding 3-chloro derivative and partly eliminates lithium bromide, thus setting free lithium 2,3- and 3,4-dehydrobenzoates that can be intercepted in situ with the hindered base.
<sup><i>t</i></sup>BuOK-Promoted Cyclization of Imines with Aryl Halides
作者:Ya-Wei Li、Hong-Xing Zheng、Bo Yang、Xiang-Huan Shan、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.0c01615
日期:2020.6.5
A transition-metal-free indole synthesis using radical coupling of 2-halotoluenes and imines via the later-stage C–N bond construction was reported for the first time. It includes an aminyl radical generation by C–H cleaving addition of 2-halotoluenes to imines via the carbanion radical relay and an intramolecular coupling of aryl halides with aminyl radicals. One standard condition can be used for
A method for producing a nitrobenzene compound represented by general formula (2), wherein R
1
and R
5
are the same or different, and each is a halogen atom or another functional group, and R
2
, R
3
, and R
4
are the same or different, and each is a hydrogen atom or another functional group, comprises oxidizing an aniline compound represented by general formula (1), wherein R
1
, R
2
, R
3
, R
4
, and R
5
are the same as described above, with hydrogen peroxide in the presence of a tungsten compound under an acidic condition, followed by oxidation with hydrogen peroxide under a neutral to alkaline condition.
[EN] ANILINOPYRAZOLE DERIVATIVES USEFUL FOR THE TREATMENT OF DIABETES<br/>[FR] DERIVES D'ANILINO-PYRAZOLE UTILISES DANS LE TRAITEMENT DES DIABETES
申请人:BAYER PHARMACEUTICALS CORP
公开号:WO2004050650A1
公开(公告)日:2004-06-17
The present invention relates to anilinopyrazole compounds, pharmaceutical compositions, and methods for treating diabetes and related disorders.
本发明涉及苯基氨嘧唑化合物、药物组合物以及用于治疗糖尿病和相关紊乱的方法。
Preparation of aromatic and heteroaromatic carboxylic acids by catalytic ozonolysis
申请人:——
公开号:US20030216577A1
公开(公告)日:2003-11-20
A process for catalytically oxidizing alkylaromatic compounds of the formula (I)
Ar—CH
2
—R
where Ar is an optionally substituted, aromatic or heteroaromatic 5-membered or 6-membered ring or a ring system having up to 20 carbon atoms where Ar may optionally be fused to a C
1
-C
6
-alkyl group in which up to 2 carbon atoms may be replaced by a heteroatom, and R is hydrogen, phenyl, benzyl or heteroaryl, where the phenyl, benzyl or heteroaryl radicals may also be joined to Ar by a bridge, or R together with Ar forms an optionally substituted ring system which may contain one or more optionally substituted heteroatoms, to the corresponding aromatic or heteroaromatic carboxylic acids in a solvent with ozone in the presence of a transition metal catalyst and optionally in the presence of an acid at a temperature between −70° C. and 110° C. to the corresponding carboxylic acid.
Cobalt-Catalyzed Oxidations in Volumetrically Expanded Liquids by Compressed Gases
申请人:Givens Richard S.
公开号:US20080139841A1
公开(公告)日:2008-06-12
Oxidations of hydrocarbons, cycloalkanes and alkenes, arylalkanes, and a variety of other organic substrates are accomplished by cobalt-N-hydroxysuccinimide co-catalyzed reactions with dioxygen under unusually mild, near ambient conditions of temperature and pressure. The improved safety of the oxidation method and the high yields of product obtained make use of a unique combination of cobalt (II) complexes with N-hydroxysuccinimide. These autoxidation reactions do not have prolonged initiation times. Many of these reactions can be safely performed under normal chemical laboratory conditions and do not require specialized equipment or reagents.