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
Highly Selective Cobalt-Mediated [6 + 2] Cycloaddition of Cycloheptatriene and Allenes
作者:Hervé Clavier、Karel Le Jeune、Innocenzo de Riggi、Alphonse Tenaglia、Gérard Buono
DOI:10.1021/ol102783x
日期:2011.1.21
[6 + 2] Cycloadditions between cycloheptatrienes with allenes have been investigated. Cobalt salts were found to promote this transformation efficiently. Moreover, this reaction was found to be highlyselective since only one regioisomer was obtained with an excellent E/Z-selectivity.
An efficient and general method for the chemoselective synthesis of unsymmetrical gem‐diborylalkanes is reported. This method is based on a late‐stage desymmetrization through nucleophilic “trifluorination”, providing chiral gem‐diborylalkanes bearing a trifluoroborate group. The reaction offers a highly modular and diastereoselective approach towards the synthesis of gem‐diborylcyclopropanes. The
Can relief of ring-strain in a cyclopropylmethyllithium drive the Brook rearrangement?
作者:Jonathan Clayden、David W. Watson、Mark Chambers
DOI:10.1016/j.tet.2004.10.099
日期:2005.3
2]-Brook rearrangement led to α-silyloxy organolithiums which on warming underwent cyclopropane ringopening and [1,5]-retro-Brook rearrangement to yield γ-silyl ketones. Despite the favourability of the cyclopropane ringopening, the Brookrearrangement still required the presence of an anion stabilising group to proceed. β-Silylketones were similarly formed by Brook–retro-Brook rearrangement on warming
Regio- and Stereoselective Synthesis of Alkyl Allylic Ethers via Gold(I)-Catalyzed Intermolecular Hydroalkoxylation of Allenes with Alcohols
作者:Zhibin Zhang、Ross A. Widenhoefer
DOI:10.1021/ol800646h
日期:2008.5.1
carbene complex and AgOTf at roomtemperature for 1 h led to isolation of (E)-(3-phenethoxy-1-butenyl)benzene in 96% yield as a single regio- and stereoisomer. Gold(I)-catalyzed intermolecular allene hydroalkoxylation was effective for monosubsituted, 1,1- and 1,3-disubstituted, trisubstituted, and tetrasubstituted allenes and for a range of primary and secondary alcohols, methanol, phenol, and propionic