Base-mediated intramolecular one-pot double-cyclization of epoxide-tethered 2-fluorobenzenesulfonamides: an avenue to 1,4-benzoxazine-fused benzothiaoxazepine-1,1-dioxides
Enantioselective Aza-Wacker-Type Cyclization Promoted by Pd-SPRIX Catalyst
作者:Abhijit Sen、Kazuhiro Takenaka、Hiroaki Sasai
DOI:10.1021/acs.orglett.8b02946
日期:2018.11.2
An enantioselective aza-Wacker-type reaction was developed. When alkenyl sulfonamide substrates were treated with the Pd-SPRIX catalyst in the presence of oxone as an oxidant, the olefin was attacked intramolecularly by the nitrogen nucleophile to construct several heterocycles such as morpholines, piperazines, piperidines, and their benzo-fused derivatives in up to 88% yield with up to 80% ee.
Copper-catalyzed carbochlorination or carbobromination via radical cyclization of aryl amines
作者:Jianing Ouyang、Xiaolong Su、Yu Chen、Yaofeng Yuan、Yi Li
DOI:10.1016/j.tetlet.2016.02.054
日期:2016.3
A copper-catalyzed radical carbochlorination or carbobromination is reported. Intramolecular cyclization occurred through aryl radicals generated in situ from bench-stable aryl amines with aqueous hydrogen halides as the halogen sources. A variety of (3-halomethyl)-1,2-dihydrobenzofuran derivatives were prepared in up to 92% yield through this one-pot protocol utilizing widely available starting materials
S-Aryldiazo xanthates, derived from the corresponding diazonium salts by reaction with potassium O-ethyl xanthate, undergo a radical chain reaction with loss of nitrogen; the intermediate aromatic radical can be captured by an internal olefin to give bicyclic xanthates in good overall yield.
Synthesis of Naturally Racemic Marilines B & C through Multicomponent Reactions Involving ortho-Quinone Methides and Various Nitrogen Nucleophiles
作者:Thomas R. R. Pettus、Yuk Fai Wong
DOI:10.1055/s-0041-1738443
日期:2023.10
the first total synthesis of (±)-marilines B and C, as well as a failed approach to (±)-mariline A, by using our recently developed multicomponent reaction method, which involves the interception of ortho-quinone methides with various nitrogennucleophiles to allow easy assembly of various benzylic amine cores with diverse substituents.
在此,我们报告了 (±)-marilines B 和 C 的首次全合成,以及 (±)-mariline A 的失败方法,通过使用我们最近开发的多组分反应方法,其中涉及邻醌甲基化物的拦截与各种氮亲核试剂一起,可以轻松组装具有不同取代基的各种苄胺核心。