Synthesis of 2-Pyridinylbenzoxazole: Mechanism for the Intramolecular Photosubstitution of the Haloarene with the Carbonyl Oxygen of the Amide Bond in Basic Medium
摘要:
2-Pyridinylbenzoxazole derivatives have been synthesized by the intramolecular photosubstitution reaction of N-(2-halophenyl)pyridinecarboxamide (1 and 2) with its amide bond in basic medium. In neutral medium both intramolecular photosubstitution and photoreduction reactions occurred. In the photosubstitution reaction a singlet state of the o-haloarene is involved, whereas in the photoreduction a triplet state of the o-haloarene is involved; oxygen inhibited the photoreduction but not the photosubstitution. The relative rate studies showed that a base accelerates the photosubstitution reaction but decelerates the photoreduction. o-Iodoarenecarboxamide is more reactive than o-bromoarenecarboxamide, which in turn is more reacitive than o-chloroarenecarboxamide. UV-vis absorption change in the presence of a base showed that an imidol and/or imidolate anion is involved in the reaction. Several transient species, such as charge-transfer excited states and a cyclohexadienyl anion radical, have been identified from the photolysis of 1 and 2 in basic medium by laser flash photolysis. In neutral medium dibromide anion radical and a phenyl a radical were identified in addition to the above intermediates. On the basis of the photokinetic and laser flash photolysis studies, an intramolecular photosubstitution of N-(o-halophenyl)-pyridinecarboxamide with its amide bond occurs via an intramolecular S-N(ET)Ar* mechanism to afford 2-pyridinylbenzoxazole derivative, and the photoreduction proceeds via a free radical mechanism to give N-phenylpyridinecarboxamide.
Copper-catalysed intramolecular O-arylation of aryl chlorides and bromides: a straightforward approach to benzo[d]oxazoles in water
摘要:
A general, efficient and more sustainable protocol for the copper-catalysed intramolecular O-arylation of o'- haloanilides leading to the benzo[d]oxazole core is reported. Remarkably, the optimised conditions allowed for the use of inexpensive and easily available aryl chlorides as arylating agents. Moreover, all reactions were carried out employing exclusively water as the solvent, rendering the methodology presented herein highly valuable from both environmental and economic points of view. (c) 2007 Elsevier Ltd. All rights reserved.
[EN] AZOLE DERIVATIVES AS WTN PATHWAY INHIBITORS<br/>[FR] DÉRIVÉS D'AZOLE EN TANT QU'INHIBITEURS DE LA VOIE WNT
申请人:OSLO UNIVERSITY HOSPITAL HF
公开号:WO2010139966A1
公开(公告)日:2010-12-09
The present invention relates to new compounds of formula I, to processes for their preparation, to pharmaceutical formulations containing such compounds and to their use in therapy. Such compounds find particular use in the treatment and/or prevention of conditions or diseases which are affected by over-activation of signaling in the Wnt pathway. For example, these may be used in preventing and/or retarding proliferation of tumor cells, for example carcinomas such as colon carcinomas.
[EN] TRIAZOLE DERIVATIVES AS WNT SIGNALING PATHWAY INHIBITORS<br/>[FR] DÉRIVÉS DE TRIAZOLE EN TANT QU'INHIBITEURS DE LA VOIE DE SIGNALISATION WNT
申请人:OSLO UNIVERSITY HOSPITAL HF
公开号:WO2012076898A1
公开(公告)日:2012-06-14
The present invention relates to compounds of formula (I), to processes for their preparation, to pharmaceutical formulations containing such compounds and to their use in therapy: Such compounds find particular use in the treatment and/or prevention of conditions or diseases which are affected by over-activation of signaling in the Wnt pathway and increased presence of nuclear β-catenin. For example, these may be used in preventing and/or retarding proliferation of tumor cells and metastasis, for example carcinomas such as colon carcinomas.
Palladium-Catalyzed Synthesis of Benzimidazoles and Quinazolinones from Common Precursors
作者:Jessie E. R. Sadig、Radleigh Foster、Florian Wakenhut、Michael C. Willis
DOI:10.1021/jo301805d
日期:2012.11.2
utilized as complementary precursors for the synthesis of important heterocycles. The synthesis of N-substituted benzimidazoles was possible from the palladium-catalyzed reaction of both classes of substrate with a variety of N-nucleophiles. The use of the imidate precursor for the synthesis of N-substituted quinazolinones by incorporation of a palladium-catalyzed aminocarbonylation reaction has also been
The present invention relates to new compounds of formula I, to processes for their preparation, to pharmaceutical formulations containing such compounds and to their use in therapy. Such compounds find particular use in the treatment and/or prevention of conditions or diseases which are affected by over-activation of signaling in the Wnt pathway. For example, these may be used in preventing and/or retarding proliferation of tumor cells, for example carcinomas such as colon carcinomas.
TRIAZOLE DERIVATIVES AS WNT SIGNALING PATHWAY INHIBITORS
申请人:Holsworth Daniel
公开号:US20140031374A1
公开(公告)日:2014-01-30
The present invention relates to compounds of formula (I), to processes for their preparation, to pharmaceutical formulations containing such compounds and to their use in therapy: Such compounds find particular use in the treatment and/or prevention of conditions or diseases which are affected by over-activation of signaling in the Wnt pathway and increased presence of nuclear β-catenin. For example, these may be used in preventing and/or retarding proliferation of tumor cells and metastasis, for example carcinomas such as colon carcinomas.