A facile and efficient approach for the synthesis of spirooxindoles has been developed via the coupling of spirocyclic C, C-palladacycles with CH2Br2. The key spirocyclic palladacycles are generated catalytically via intramolecular remote C–H activation. A range of spirooxindoles can be synthesized in good to excellent yields from readily available starting materials.
Carboxylic Acids as A Traceless Activation Group for Conjugate Additions: A Three-Step Synthesis of (±)-Pregabalin
作者:Lingling Chu、Chisa Ohta、Zhiwei Zuo、David W. C. MacMillan
DOI:10.1021/ja505964r
日期:2014.8.6
carboxylic acids as a traceless activation group for radical Michael additions has been accomplished via visible light-mediated photoredox catalysis. Photon-induced oxidation of a broad series of carboxylic acids, including hydrocarbon-substituted, α-oxy, and α-amino acids, provides a versatile CO2-extrusion platform to generate Michael donors without the requirement for organometallic activation or propagation
羧酸作为自由基迈克尔加成的无痕活化基团的直接应用是通过可见光介导的光氧化还原催化实现的。光子诱导氧化一系列广泛的羧酸,包括碳氢化合物取代的、α-氧基和 α-氨基酸,提供了一个多功能的 CO2 挤出平台来生成迈克尔供体,而无需有机金属活化或传播。多种迈克尔受体适用于这种新的共轭加成策略。还介绍了该技术在药物普瑞巴林(由辉瑞以商品名 Lyrica 商业化)的三步合成中的应用。
Double Functionalization of Styrenes by Cu-Mediated Assisted Tandem Catalysis
Various C–C and C‐X bonds could be formed by doublefunctionalization of olefins featuring Cu‐mediated assistedtandemcatalysis. Furthermore, one‐pot indoline syntheses with o‐bromostyrenes as an application could be achieved.
A 1,4‐Palladium Migration/Heck Sequence with Unactivated Alkenes: Stereoselective Synthesis of Trisubstituted 1,3‐Dienes
作者:Ze‐Jian Xue、Meng‐Yao Li、Bin‐Bin Zhu、Zhi‐Tao He、Chen‐Guo Feng、Guo‐Qiang Lin
DOI:10.1002/adsc.202001589
日期:2021.4.13
The palladium‐catalyzedcross‐coupling of ortho‐vinyl aromatic bromides and olefins was achieved through a controllable 1,4‐palladium migration/Heck cascade protocol. The reaction represents a mild, efficient and highly stereoselective method for the synthesis of trisubstituted 1,3‐dienes, especially for triaryl‐substituted ones.
A RhIII‐catalyzed intramolecularoxidative cross‐coupling between double bonds for the synthesis of macrolides is described. Under the optimized reaction conditions, macrocycles containing a diene moiety can be formed in reasonable yields and with excellent chemo‐ and stereoselectivity. This method provides an efficient approach to synthesize macrocyclic compounds containing a 1,3‐conjugated diene