Regioselective Functionalization of Ester-, Amide-, Carbonate-, and Carbamate-Substituted 2-Phenyl-2-oxazolines with Mixed Lithium–Magnesium Amides
作者:Leandro A. Bozzini、Thiago dos Santos、Valter E. Murie、Murilo B. M. de Mello、Ricardo Vessecchi、Giuliano C. Clososki
DOI:10.1021/acs.joc.0c02369
日期:2021.1.1
highly functionalized benzenederivatives by regioselective metalation of ester-, amide-, carbamate-, and carbonate-substituted 2-phenyl-2-oxazolines with mixed lithium–magnesium amides followed by reaction with different electrophiles. While a complementary metalation site can be accessed by using different bases, steric and electronic effects promoted by the aromatic ring substituents also play an important
我们通过将酯,酰胺,氨基甲酸酯和碳酸盐取代的2-苯基-2-恶唑啉与锂-镁酰胺混合体进行区域选择性金属化,然后与不同的亲电试剂反应,制备了新型的高度官能化的苯衍生物。尽管可以通过使用不同的碱基来访问互补的金属化位点,但由芳环取代基促进的空间和电子效应在反应区域选择性中也起着重要作用。芳香族氢p K a值的计算计算已帮助我们通过络合物诱导的邻近效应概念使金属化偏好合理化。
Ruthenium-Catalyzed Selective Aerobic Oxidative<i>ortho</i>-Alkenylation of Substituted Phenols with Alkenes through C-H Bond Activation
作者:Mallu Chenna Reddy、Masilamani Jeganmohan
DOI:10.1002/ejoc.201201463
日期:2013.2
The oxidative coupling of phenyl carbamates and acetates with alkenes in the presence of a catalytic amount of [RuCl2(p-cymene)]2, AgSbF6, and Cu(OAc)2·H2O under air provided substituted alkene derivatives in a highly regio- and stereoselective manner. The catalytic reaction was compatible with various alkenes such as acrylates, vinyl sulfones, acrylonitrile, and substituted styrenes. The present catalytic
Photochemically Driven Nickel‐Catalyzed Carboxylative C−N Coupling: Scope and Mechanism**
作者:Seifallah Abid、Kevin P. Quirion、Yi Yang、Renhe Tang、Binh Khanh Mai、Peng Liu、Anis Tlili
DOI:10.1002/chem.202301271
日期:2023.8.4
The carboxylative Buchwald–Hartwigamination is disclosed herein under mild conditions of temperature and under atmospheric pressure of CO2. The key to success is the use of a dual strategy organophotocatalysis/nickel catalysis under visible light irradiation. The developed conditions demonstrated high functional group tolerance toward (hetero)aryl iodide and bromide. Furthermore, preliminary mechanistic