Metal-free intramolecular α-sp3 C–H oxygenation of tert-amine: An efficient approach to 1,3-oxazines
作者:Mohit L. Deb、Choitanya Dev Pegu、Paran J. Borpatra、Pranjal K. Baruah
DOI:10.1016/j.tetlet.2016.10.086
日期:2016.12
iodine-tert-butylhydroperoxide promoted intramolecular sp3 C–H oxygenation α- to tertiary amine for the synthesis of 1,3-oxazines. The reaction is metal-free, atom economic, high yielding and proceeds within a short time under heating at 130 °C in DMF solvent. A variety of Betti bases of naphthol and phenol having cyclic as well as acyclic tert-amine moieties are employed as the starting materials. The Betti
在这里,我们公开了碘-叔丁基过氧化氢促进分子内sp 3 C–H氧化α-生成叔胺,用于合成1,3-恶嗪。该反应是无金属的,原子经济的,高产率的,并且在DMF溶剂中在130℃加热下在短时间内进行。各种萘酚的贝提碱和具有环状苯酚以及非环状叔-胺部分被用作起始原料。萘酚的Betti碱可产生单一的恶嗪非对映异构体,而酚Betti碱可提供非对映体混合物。机理研究表明,涉及“ I + ”作为活性催化物质的非自由基途径。该方法在数克规模的反应上具有优异的产率。
Deconstructive annulation mediated one-pot synthesis of xanthene derivatives
deconstructive annulation methodology. Sequential oxidative C(sp3)–O/C(sp3)–N cleavage followed by intramolecular/intermolecular annulationreaction was carried out under aerobic reaction conditions. Mechanistic analyses performed on the substrate revealed that the C(sp3)–O bond cleavage supersedes the C(sp3)–N bond scission. The in situ generated Betti base intermediate through the C(sp3)–O cleavage