Intermolecular Allene Functionalization by Silver-Nitrene Catalysis
作者:Manuel R. Rodríguez、María Besora、Francisco Molina、Feliu Maseras、M. Mar Díaz-Requejo、Pedro J. Pérez
DOI:10.1021/jacs.0c04395
日期:2020.7.29
Under silver catalysis conditions, using [Tp*,BrAg]2 as the catalyst precursor, allenes react with PhI=NTs in the first example of efficient metal-mediated intermolecular nitrenetransfer to such substrates. The nature of the substituent at the allene seems crucial for the reaction outcome since arylallenes are converted into azetidine derivatives whereas methylene aziridines are the products resulting
Asymmetric syntheses by means of (−)-sparteine modified organometallic reagents
作者:H. Nozaki、T. Aratani、T. Toraya、R. Noyori
DOI:10.1016/s0040-4020(01)92490-1
日期:1971.1
hydrocarbons, and this shows that the intermediate leading to allene is lithium carbenoid (or α-bromocyclopropyllithium) rather than free cyclopropylidene. Addition of organolithium or a Grignard reagent to carbonyl compounds proceeds dissymmetrically to afford carbinols of up to 22% optical purity. Finally lithiation of ethylbenzene with n-BuLi has been examined in the presence of (-⊃-sparteine and
This report showcases the stereospecific and modular synthesis of vinyl cyclopropanes in less than 30 min at room temperature, employing air-stable dinuclear PdI catalysis.