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.
Toda, Fumio; Shigemasa, Tatsuya, Journal of the Chemical Society. Perkin transactions I, 1989, p. 209 - 211
作者:Toda, Fumio、Shigemasa, Tatsuya
DOI:——
日期:——
Electroreductive cross-coupling between aldehydes and ketones or imines <i>via</i> cathodically generated dianions
作者:Lu-Jun Wang、Peng Ye、Ninghua Tan、Bo Zhang
DOI:10.1039/d2gc03177a
日期:——
class of compounds. Nonetheless, the preparation of unsymmetrical 1,2-diols via the direct cross-coupling of two different carbonylcompoundsundersimple and mild conditions remains an elusive goal. Herein, an operationally simple electroreductive cross-coupling of two common carbonyls, aldehydes and ketones using electrons as safe reducing agents is reported. By applying this new protocol, a library