Photocatalytic Giese Addition of 1,4-Dihydroquinoxalin-2-ones to Electron-Poor Alkenes Using Visible Light
作者:Jaume Rostoll-Berenguer、Gonzalo Blay、José R. Pedro、Carlos Vila
DOI:10.1021/acs.orglett.0c02953
日期:2020.10.16
The optimized reaction conditions provide a good yield for the radical conjugate addition products (44 examples) with a wide range of structurally different Michael acceptors. A gram scale reaction using sunlight irradiation is also described. Furthermore, several transformations were carried out with the Giese addition products.
使用Ru(bpy)3 Cl 2作为光催化剂和(PhO)2 PO 2 H作为添加剂,实现了1,4-二氢喹喔啉-2-酮与Michael受体的可见光光氧化还原催化偶联。优化的反应条件为具有广泛结构上不同的迈克尔受体的自由基共轭加成产物(44个实例)提供了良好的收率。还描述了使用阳光照射的克级反应。此外,使用Giese添加产品进行了几次转化。
A Facile and Efficient Synthesis of Six-Membered Enol Carbocyclic Compounds
作者:De-Suo Yang、Zheng-Hui Guan、Sen Ke、Ming-Jin Fan、Hai-Tao Zhu、Xiao-Ling Wang
DOI:10.1055/s-0035-1560517
日期:——
A facile and efficient method for the synthesis of six-membered enol carbocyclic compounds was realized by intermolecular cyclization reaction of 3-aryllidenepentane-2,4-diones with t-BuOK in CH2Cl2. The reaction is conducted under mild conditions and shows good functional group tolerance.
A new formal [1 + 2 + 3] annulation of o-alkenyl arylisocyanides with α, β-unsaturatedketones under metal-, base-, and acid-free conditions is disclosed. This domino reaction provides a general protocol for the efficient and practical synthesis of a wide range of carbazole derivatives from readily available starting materials in a single operation. Furthermore, this methodology was used as the key