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。
Copper-catalyzed tandem aryl–halogen hydroxylation and CH<sub>2</sub>Cl<sub>2</sub>-based N,O-acetalization toward the synthesis of 2,3-dihydrobenzoxazinones
作者:Xuwen Chen、Wenyan Hao、Yunyun Liu
DOI:10.1039/c7ob00625j
日期:——
The concise synthesis of 2,3-dihydro-4H-benzo[e][1,3]oxazin-4-ones has been accomplished by copper-catalyzedtandemreactions of o-halobenzamides, LiOH and dichloromethane. The aryl–halogen bond hydroxylation and subsequent N,O-acetalization on CH2Cl2 are enabled under catalytic conditions which allows the generation of C(sp2)–O, C(sp3)–O and C(sp3)–N bonds to give the target products.