CuI-Mediated Cross-Coupling of Aryl Halides with Oximes: A Direct Access to O-Aryloximes
摘要:
The first Cu-catalyzed cross-coupling of aromatic oximes and haloarenes is reported. This one-step formation of the N-O-Ar linkage gives access to a range of oxime ethers in good to moderate yields.
The oximeethers (7) and (8)(R = alkyl or aryl) undergo base-catalysed elimination to benzonitriles (3) in water–dioxan (4 : 1) at 25°. The Z-isomer (8Z) reacts via hydroxide-catalysed antiperiplanar elimination 70-fold more rapidly than the corresponding E-isomer. Electronic effects on syn-elimination (from 7E) show that electronwithdrawing groups aid elimination in both Ar and in the leaving group
Eliminations from (E)-O-arylbenzaldehyde oximes promoted by hydroxide in 60% aq. Dimethyl sulphoxide. Mechanism and transition-state characteristics of nitrile-forming eliminations
作者:Bong Rae Cho、Jong Chan Lee、Nam Soon Cho、Kee Dong Kim
DOI:10.1039/p29890000489
日期:——
Reactions of the (E)-O-arylbenzaldehyde oximes (1; Ar = 2,4-dinitrophenyl), (2; Ar =p-nitrophenyl), and (3; Ar = phenyl) with OH– in 60% aq. DMSO have been investigated. The eliminations are quantitative, producing only benzonitriles and aryloxides. The observation of second-order kinetics, k2OD–/k2OH–= 1.15–1.84, and βlg=–0.59 is consistent with an E2 mechanism. The Hammett ρ and k2OD–/k2OH– values
(的反应ë) - Ö -arylbenzaldehyde肟(1 ; Ar为2,4-二硝基苯基),(2 ; Ar为p硝基苯基),和(3 ; Ar为苯基)与OH -在60%的水溶液。已对DMSO进行了调查。消除是定量的,仅产生苄腈和芳基氧化物。的二级动力学的观察,ķ 2 OD - / ķ 2 OH - = 1.15-1.84,和β LG = -0.59是具有一致的ë 2机构。哈米特ρ和k 2 OD – / k 2OH –离开群体较弱的人会增加价值。对于给定的衬底上的ķ 2 OD - /ķ 2 OH -值保持(实验误差之内)大致恒定,尽管在β芳基取代基的变化。过渡态参数的这些变化可以根据所涉及的形成亚硝酸盐的不同过渡态来解释。
[EN] COMPOSITIONS FOR THE TREATMENT OF HYPERTENSION AND/OR FIBROSIS<br/>[FR] COMPOSITIONS POUR LE TRAITEMENT DE L'HYPERTENSION ET/OU DE LA FIBROSE
申请人:VECTUS BIOSYSTEMS LTD
公开号:WO2018053587A1
公开(公告)日:2018-03-29
The present invention relates to novel compounds and their use in the prophylactic and/or therapeutic treatment of hypertension and/or fibrosis.
本发明涉及新型化合物及其在预防和/或治疗高血压和/或纤维化方面的应用。
Novel estrogenic compounds, obtainable by heat treatment of conjugated estrogens in high humidity
申请人:Barr Laboratories, Inc.
公开号:EP1464650A2
公开(公告)日:2004-10-06
The present invention relates to novel estrogenic compounds. The present invention also relates to methods of treating estrogen deprivation in a subject comprising administering novel estrogenic compounds. Additionally, the present invention relates to methods of synthesizing novel estrogenic compounds.