Microwave-Promoted Palladium-Catalysed Oxyarylation of Dihydronaphthalene and Chromenes by o-Iodophenols and Its Acetates
作者:Raquel A. C. Leão、Vagner D. Pinho、Artur S. Coelho、Camilla D. Buarque、Paula F. Moraes、Diego A. Alonso、Carmen Nájera、Paulo R. R. Costa
DOI:10.1002/ejoc.201100365
日期:2011.6
The oxyarylation of dihydronaphthalene (1a), two electron-rich (1b,c) and one electron-poor (2) chromenes with different o-iodophenols and their acetates 3a–h has been investigated by using either Pd(OAc)2 (10 mol-%) as precatalyst and Ag2CO3 as base in acetone as solvent or oxime palladacycle 5 as precatalyst and dicyclohexylamine as base in DMA/H2O. The reactions, which were strongly accelerated
Synthesis of Dihydrobenzofurans via Palladium-Catalyzed Annulation of 1,3-Dienes by <i>o</i>-Iodoaryl Acetates
作者:Roman V. Rozhkov、Richard C. Larock
DOI:10.1021/jo100495t
日期:2010.6.18
palladium-catalyzed annulation of 1,3-dienes by o-iodoaryl acetates provides an efficient approach to biologically interesting dihydrobenzofurans. The annulation is believed to proceed via (1) oxidative addition of the aryl iodide to Pd(0), (2) syn-addition of the resulting arylpalladium complex to the 1,3-diene, (3) intramolecular coordination of the phenolic oxygen to the Pd center, (4) hydrolysis of the acetyl
LiCl-Mediated Preparation of Functionalized Benzylic Indium(III) Halides and Highly Chemoselective Palladium-Catalyzed Cross-Coupling in a Protic Cosolvent
作者:Yi-Hung Chen、Mai Sun、Paul Knochel
DOI:10.1002/anie.200805588
日期:2009.3.9
Sensitive functional groups such as COR, CHO, or CH2OH can be present in benzylic indium reagents prepared by the direct insertion of indium in the presence of LiCl. These reagents undergo palladium‐catalyzed cross‐coupling reactions in the presence of a protic cosolvent after activation with iPrMgCl⋅LiCl (see scheme). Remarkable chemoselectivities are achieved by using various electrophiles containing