α1-Adrenoceptor Agonists: The Identification of Novel α1A Subtype Selective 2′-Heteroaryl-2-(phenoxymethyl)imidazolines
摘要:
Novel 2'-heteroaryl-2-(phenoxymethyl)imidazolines have been identified as potent agonists of the cloned human alpha(1)-adrenoceptors in vitro. The nature of the 2'-heteroaryl group can have significant effects on the potency, efficacy, and subtype selectivity in this series. alpha(1A) Subtype selective agonists have been identified. (C) 2002 Elsevier Science Ltd. All rights reserved.
Palladium-Catalyzed Aryl−Aryl Cross-Coupling Reaction Using <i>ortho</i>-Substituted Arylindium Reagents<sup>†</sup>
作者:Miguel A. Pena、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1021/jo062148s
日期:2007.2.1
A range of biaryl compounds (aryl−aryl, aryl−heteroaryl, and heteroaryl−heteroaryl) can be efficiently prepared by a palladium-catalyzed cross-coupling reaction between ortho-substituted triarylindium reagents and aryl halides. The triarylindium reagents are prepared by directed ortho-lithiation and transmetallation to indium from the corresponding benzene derivatives using various directed metallation
The sequential construction of diversified multifunctionalized thiazole derivatives through Pd-catalyzed regioselective C-H alkenylation has been accomplished. This versatile approach provides the diversified thiazole derivatives featuring orthogonal substitution patterns at the C-2, C-4 and C-5 positions from mono-substituted (2- or 4-substituted) thiazole derivatives or even more challenging simple
Abstract A general and efficient Rh(III)-catalyzed ortho-C–H alkylation of 2-arylbenzothizazoles and 2-arylthiazoles with potassium alkyltrifluoroborates has been developed. The present method leads to the construction of a library of alkylated 2-arylbenzothiazoles and 2-arylthiazoles with yields up to 99%. A general and efficient Rh(III)-catalyzed ortho-C–H alkylation of 2-arylbenzothizazoles and
Preparation of 2- and 5-Aryl Substituted Thiazoles via Palladium-Catalyzed Negishi Cross-Coupling
作者:Jacob Jensen、Niels Skjaerbaek、Per Vedsø
DOI:10.1055/s-2001-9753
日期:——
2-Aryl substituted thiazoles 3a-k were prepared by oxidative insertion of zinc into 2-bromothiazole (1) followed by palladium(0)-catalyzed Negishi cross-coupling in a one-pot procedure. 5-Aryl substituted thiazoles 6a-i were prepared by regioselective C-5 lithiation of 2-(trimethylsilyl)thiazole (4) follwed by transmetalation with zinc chloride and palladium(0)-catalyzed Negishi cross-coupling in a one-pot procedure. The synthetic sequences were combined to give 2,5-diaryl substituted thiazoles 8a, b and 10 via stepwise C-2 and C-5 arylation and vice versa.
A mild and efficient Ru-catalyzed ortho-oxidative alkenylation of 2-arylbenzo[d]thiazoles through twofold C-H bond functionalization in aqueous solution of anionic surfactant sodium dodecylbenzenesulfonate (SDBS) has been developed using activated olefins as coupling partner. The protocol could be carried out smoothly on a gram scale, recyclable, and applicable to 2-arylthiazoles.
通过使用活化烯烃作为偶联伙伴,在阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的水溶液中通过两倍的CH键官能化,温和有效地Ru催化了2-芳基苯并[ d ]噻唑的Ru催化正氧化烯基化。该方案可以以克为单位平稳地进行,可回收并适用于2-芳基噻唑。