One-Pot Synthesis of 1,4-Diarylnaphthalenes via a Wittig-Horner Reaction/[4+2] Cycloaddition/Dehydrogenation Sequence
作者:Yanguang Wang、Zhengbo Chen、Wangge Shou
DOI:10.1055/s-0028-1083356
日期:2009.4
A one-pot synthesis of 1,4-diarylnaphthalenes from cinnamaldehydes, dimethyl benzylphosphonates, and benzenediazonium-2-carboxylate is described. The tandem process involves the Wittig-Hornerreaction of the cinnamaldehyde with the benzylphosphonate, [4+2] cycloaddition of the thus-formed diene with benzyne, and subsequent dehydrogenation. The procedure is general and efficient and the substrates are
Palladium-catalyzed oxidative homocoupling of potassium alkenyltrifluoroborates: synthesis of symmetrical 1,3-dienes
作者:Minéia Weber、Fateh V. Singh、Adriano S. Vieira、Hélio A. Stefani、Marcio W. Paixão
DOI:10.1016/j.tetlet.2009.04.127
日期:2009.7
Herein, we describe a convenient method for the synthesis of symmetrical 1,3-dienes employing an oxidative palladium-catalyzed homocoupling of potassium alkenyltrifluoroborates providing products in good yields relative to existing methodologies. This is the first report of a cross-dimerization of potassium alkenyltrifluoroborates. (C) 2009 Elsevier Ltd. All rights reserved.