Substrate scope in the direct imine acylation of ortho-substituted benzoic acid derivatives: the total synthesis (±)-cavidine
作者:Christiana Kitsiou、William P. Unsworth、Graeme Coulthard、Richard J.K. Taylor
DOI:10.1016/j.tet.2014.04.066
日期:2014.10
The direct imine acylation (DIA) and subsequent cyclisation of a range of imines with ortho-substitutedbenzoicacid derivatives is described. Variation in the coupling reagents, imine and benzoicacid were all examined. The DIA procedure was also applied in the total synthesis of (±)-cavidine.
Predictably Selective (sp<sup>3</sup>)C–O Bond Formation through Copper Catalyzed Dehydrogenative Coupling: Facile Synthesis of Dihydro-oxazinone Derivatives
作者:Atanu Modak、Uttam Dutta、Rajesh Kancherla、Soham Maity、Mohitosh Bhadra、Shaikh M. Mobin、Debabrata Maiti
DOI:10.1021/ol500670h
日期:2014.5.16
An intramolecular dehydrogenative (sp3)C–O bond formation in salicylamides can be initiated by an active Cu/O2 species to generate pharamaceutically relevant dihydro-oxazinones. Experimental findings suggest that stereoelectronic parameters in both coupling partners are controlling factors for site selectivity in bond formation. Mechanistic investigations including isotope labeling, kinetic studies
水杨酰胺中分子内脱氢(sp 3)C–O键的形成可以由活性Cu / O 2物种引发,以生成药物相关的二氢-恶嗪酮。实验结果表明,两个偶合伙伴中的立体电子参数是键形成中位点选择性的控制因素。包括同位素标记在内的机械研究,动力学研究有助于提出催化循环。该方法为正在研究的新药CX-614的合成提供了便利,该新药具有寻找帕金森氏病和阿尔茨海默氏病治疗的潜力。
Direct Imine Acylation: Rapid Access to Diverse Heterocyclic Scaffolds
作者:William P. Unsworth、Christiana Kitsiou、Richard J. K. Taylor
DOI:10.1021/ol303073b
日期:2013.1.18
A simple and efficient procedure to prepare a range of diverse heterocycles by the direct acylation of imines using a variety of functionalized benzoic acids is described. The methodology features a novel method for N-acyliminium ion generation followed by in situ intramolecular trapping by oxygen-, nitrogen-, sulfur- and carbon-based nucleophiles. Preliminary mechanistic studies, using ReactIR, are also reported.
Synthesen von Heterocyclen, 116. Mitt.: �ber Reaktionen mit Salicyls�urechlorid
作者:E. Ziegler、Th. Kappe、G. Kollenz
DOI:10.1007/bf00904338
日期:——
I<sub>2</sub>-Catalyzed cross dehydrogenative coupling: rapid access to benzoxazinones and quinazolinones
作者:Kaili Chen、Biao Gao、Yanguo Shang、Jianyao Du、Qinlan Gu、Jinxin Wang
DOI:10.1039/c7ob02038d
日期:——
efficient and applicable I2-catalyzed intramolecular dehydrogenative C-O/C-N coupling reaction via activating the C-H bond adjacent to the N atom has been developed to provide dozens of substituted benzoxazinones (31 examples) and quinazolinones (5 examples) in good to excellent yields (up to 98%). This one-pot methodology has significant advantages, including metal-free process, broad substrate scope,