Cyclodehydration of cis–2-butene-1,4-diol with active methylene compounds catalyzed by a diphosphinidenecyclobutene-coordinated palladium complex
作者:Hiromi Murakami、Yukio Matsui、Fumiyuki Ozawa、Masaaki Yoshifuji
DOI:10.1016/j.jorganchem.2006.03.011
日期:2006.7
(pi-Allyl)palladium triflate coordinated with 1,2-bis(4-methoxyphenyl)-3,4-bis(2,4,6-tri-t-butylphenylphosphinidene)cyclobutene (DPCB-OMe), [Pd(eta(3)-C3H5)(DPCB-OMe)]OTf, efficiently catalyzes cycl odehydration of cis-2-butene-1,4-diol with active methylene compounds such as acetylacetone and ethyl acetoacetate in toluene in the presence of pyridine. The reactions can be performed in air, giving 2-vinyl-2,3-dihydrofurans in good to high yields. (c) 2006 Elsevier B.V. All rights reserved.