A novel synthetic method for γ-butyrolactones is presented. The process involves high regioselectivity to afford γ-lactones. In cases of trichloroacetates of secondary allylic alcohols, high cis-selective cyclization is accomplished.
New and improved catalysts for transition metal catalysed radical reactions
作者:Floryan de Campo、Dominique Lastécouères、Jean-Baptiste Verlhac
DOI:10.1039/a804915g
日期:——
New CuI and FeII complexes displayed considerable improvements in atom transfer radical addition reactions.
新的 CuI 和 FeII 复合物在原子转移自由基加成反应中表现出相当大的改进。
New copper(I) and iron(II) complexes for atom transfer radical macrocyclisation reactions
作者:Floryan De Campo、Dominique Lastécouères、Jean-Baptiste Verlhac
DOI:10.1039/a908245j
日期:——
New Cu(I) and Fe(II) complexes have been synthesized and proved to be efficient catalysts for atom transfer radical addition (ATRA) reactions. The catalytic activity was found to be greater than existing atom transfer systems based upon CuCl(bipyridine) or RuCl2(PPh3)3, for example. The addition of a reducing agent considerably improved the efficiency of the usual procedures.
Atom Transfer Radical Cyclisations Mediated by the Grubbs Ruthenium Metathesis Catalyst
作者:Peter Quayle、David Fengas、Stuart Richards
DOI:10.1055/s-2003-41466
日期:——
The commercially available ruthenium carbene complex RuCl2(=CHPh)(PCy3)2 efficiently catalyses the cyclisation of halo alkenes to γ-lactones and γ-lactams.