Superelectrophilic Fe(III)–Ion Pairs as Stronger Lewis Acid Catalysts for (<i>E</i>)-Selective Intermolecular Carbonyl–Olefin Metathesis
作者:Haley Albright、Hannah L. Vonesh、Corinna S. Schindler
DOI:10.1021/acs.orglett.0c00917
日期:2020.4.17
intermolecular carbonyl–olefin metathesis reaction is described that relies on superelectrophilic Fe(III)-based ionpairs as stronger Lewis acid catalysts. This new catalytic system enables selective access to (E)-olefins as carbonyl–olefin metathesis products. Mechanistic investigations suggest the regioselective formation and stereospecific fragmentation of intermediate oxetanes to be the origin of this
描述了一种分子间羰基-烯烃复分解反应,该反应依赖于超亲电 Fe(III) 基离子对作为更强的路易斯酸催化剂。这种新的催化系统能够选择性地使用 ( E )-烯烃作为羰基-烯烃复分解产物。机理研究表明,中间体氧杂环丁烷的区域选择性形成和立体特异性断裂是这种选择性的来源。优化的条件适用于各种芳基醛和三取代烯烃,并在 28 个示例中得到证明,总产率高达 64%。
A facile and convenient sequential homobimetallic catalytic approach towards β-methylstyrenes. A one-pot Stille cross-coupling/isomerization strategy
作者:Sebastián O. Simonetti、Enrique L. Larghi、Teodoro S. Kaufman
DOI:10.1039/c4ob00604f
日期:——
A one-pot approach towards β-methylstyrenes is reported. The transformation involves a Stille cross-coupling reaction of aryl halides with allyltributylstannane, followed by an in situ Pd-catalyzed double bond conjugative migration.
The sensitizedphotooxygenation of several 9-vinylphenanthrenes in carbon tetrachloride was investigated. In the cases of 9-vinyl- and 9-(β-substituted vinyl) phenanthrenes, the 1,4-cycloaddition o...