Oxidative Radical-Mediated Addition of Ethers to Quinone Imine Ketals: An Access to Hemiaminals
作者:Satish G. More、Rohit B. Kamble、Gurunath Suryavanshi
DOI:10.1021/acs.joc.0c02254
日期:2021.2.5
synthesis of substituted hemiaminal via addition of ethers to quinone imine ketals (QIKs) has been developed under metal-free conditions. In the presence of tetrabutylammonium chloride and potassium persulfate (K2S2O8), QIKs couple efficiently with cyclic and acyclic ethers to give hemiaminals. This strategy offers an easy access to substituted hemiaminal ethers with high functional group tolerance in good
通过在无金属条件下开发通过将醚添加到醌亚胺缩酮(QIKs)的高度区域选择性合成取代的烟酰胺的方法。在氯化四丁基铵和过硫酸钾(K 2 S 2 O 8)的存在下,QIK与环状和非环状醚有效偶联,得到缩醛。此策略可轻松获得具有高官能团耐受性且产率高至优异的取代的人类薄荷醚。
Nitrogen-Bridged, Natural Product Like Octahydrobenzofurans and Octahydroindoles: Scope and Mechanism of Bridge-Forming Reductive Amination via Caged Heteroadamantanes
作者:Steven. M. Wales、Holly V. Adcock、William Lewis、Daniel Hamza、Christopher J. Moody
DOI:10.1002/ejoc.201800962
日期:2018.9.16
vast array of bioactive, bridged alkaloids, we report the synthesis of unique, densely functionalised tricyclic scaffolds based on nitrogen-bridged, octahydrobenzofurans and octahydroindoles. These heterocycle-rich frameworks were assembled by a one-pot, two-step bridge-forming reductive amination process, which was shown to proceed via caged, heteroadamantane intermediates that thermodynamically drive
A highly selective para C–H amination of unprotected phenols with iminoquinone acetals was realized, giving the functional phenols in good to excellent yields. Overall, this transformation is operationally simple, proceeds with readily available phenols, and has wide substrate scope and low catalyst loading. The biarylamine product is stochastically formed via [5,5]-sigmatropic rearrangement of a mixed
Desymmetric [3+3] Cyclization of <i>p</i>-Quinamines for the Synthesis of 1,2,4-Oxadiazines and Hydroquinoxalines
作者:Xuerui Wang、Weiwu Ren
DOI:10.1021/acs.orglett.3c04157
日期:2024.3.8
General and efficient strategies for highly diastereoselective synthesis of divergent heterocyclic scaffolds through desymmetric [3+3] cycloaddition of p-quinamines with 1,3-dipole surrogates hydroximoyl halides and α-halohydroxamates have been developed. This synthetic protocol provided a variety of heterocyclic architectures containing 1,2,4-oxadiazine and hydroquinoxaline skeletons in good yields