reaction of aromaticaldehydes and arylketones with a silylboronate in the presence of a catalytic amount of a CuCl-N-heterocyclic carbene (NHC) complex and a stoichiometric amount of alkoxide base yielded cross-coupled 1,2-diol derivatives. A reaction pathway is proposed that involves the catalytic formation of a nucleophilic α-silyloxybenzylcopper(I) species from the aromaticaldehyde and its subsequent
C,O-Dilithiated Diarylmethanols: Easy and Improved Preparation by Naphthalene-Catalysed Lithiation of Diaryl Ketones and Reactivity Toward Electrophiles
作者:David Guijarro、Balbino Mancheño、Miguel Yus
DOI:10.1016/s0040-4020(01)85822-1
日期:1993.2
The lithiation of different diaryl ketones 1 with an excess of lithium powder and a catalytic amount (8 mol %) of naphthalene in tetrahydrofuran at -30-degrees-C leads to the formation of the corresponding dianions of the type I, with Met=Li, which react with several electrophiles (E+=MeI, EtBr, PriCHO, PhCHO, cyclohexanone, MeCN) to give, after hydrolysis, the expected substituted diarylmethanols 2.