Structural effects in solvolytic reactions. XI. Rates and products of solvolysis of 2-aryl- and 2-methyl-2-norbornenyl p-nitrobenzoates. Exo:endo rate ratio as a function of increasing electron demand
Toward a mild dehydroformylation using base-metal catalysis
作者:Dylan J. Abrams、Julian G. West、Erik J. Sorensen
DOI:10.1039/c6sc04607j
日期:——
biosynthesis of cholesterol and related sterols under mild conditions using base-metal catalysts. In contrast, chemists have recently developed a non-oxidative dehydroformylation method; however, it requires high temperatures and a precious-metal catalyst. Careful study of both approaches has informed our efforts to design a base-metal catalyzed, mild dehydroformylation method that incorporates benefits from
A regio- and diastereoselective palladium-catalyzed cyclopropanation of norbornene derivatives with molecular oxygen as the sole oxidant
作者:Wanqing Wu、Huanfeng Jiang、Yang Gao、Huawen Huang、Wei Zeng、Derong Cao
DOI:10.1039/c2cc35124b
日期:——
A mild and efficient Pd-catalyzed cyclopropanation of norbornene derivatives with tertiary propargylic alcohols usingmolecularoxygen as the soleoxidant is described. This process allows quick and atom-economical assembly of various 1,2,3-trisubstituted cyclopropanes bearing alpha,beta-unsaturated ketone moieties in high yields as a single regio- and diastereoisomer.
Several mono or non conjugated diolefins are submitted to the action of oxygen in presence of catalytic amounts of PdCl (NO2) (CH3CN)2. Depending on the olefin structures methylketones or epoxides are obtained.
Synthesis of Cyclic Azomethine Imines by Cycloaddition Reactions of <i>N</i>-Isocyanates and <i>N</i>-Isothiocyanates
作者:Amanda Bongers、Indee Ranasinghe、Philippe Lemire、Alyssa Perozzo、Jean-François Vincent-Rocan、André M. Beauchemin
DOI:10.1021/acs.orglett.6b01788
日期:2016.8.5
2]-cycloaddition reactions to form azomethine imines containing triazolone, triazole–thione, and pyrazole–thione cores. First, iminoisothiocyanates are shown to undergo aminothiocarbonylation reactions with strained alkenes, and a comparison with recently reported reactions of iminoisocyanates highlights their reduced reactivity. In contrast, amino(thio)carbonylation reactions of imines with iminoisocyanates
Copper‐Catalyzed Carbonylative Hydroamidation of Styrenes to Branched Amides
作者:Yang Yuan、Fu‐Peng Wu、Claas Schünemann、Jens Holz、Paul C. J. Kamer、Xiao‐Feng Wu
DOI:10.1002/anie.202010509
日期:2020.12.7
Amides are one of the most ubiquitous functional groups in synthetic and medicinal chemistry. Novel and rapid synthesis of amides remains in high demand. In this communication, a general and efficient procedure for branch‐selective hydroamidation of vinylarenes with hydroxyamine derivatives enabled by copper catalysis has been developed for the first time. The reaction proceeds under mild conditions