Copper(I)/Ligand-Catalyzed 5-<i>endo</i> Radical Cyclization–Aromatization of 2,2,2-Trichloroethyl Vinyl Ethers: Synthesis of 2,3-Difunctionalized 4-Chlorofurans
作者:Ram N. Ram、Dharmendra Kumar Gupta、Vineet Kumar Soni
DOI:10.1021/acs.joc.5b02830
日期:2016.2.19
Copper(I)/ligand-catalyzed one pot synthesis of highly substituted 2,3-difunctionalized-4-chlorofurans has been reported. The reaction proceeds via a Cu(I)-catalyzed regioselective 5-endo-trig radical cyclization of 2,2,2-trichloroethyl vinyl ethers followed by the base-promoted dehydrochlorination. The success of the kinetically disfavored 5-endo cyclization was attributed to the formation of captodatively
已经报道了铜(I)/配体催化的高度取代的2,3-二官能化的4-氯呋喃的一锅合成。通过铜(I) -催化的区域选择性5-反应的进行内切- TRIG自由基的2,2,2-三氯乙烯基醚环化随后碱促进的脱氯化氢。的动力学成功不受欢迎5-内环化归因于captodatively稳定自由基中间体在环化步骤和相对高的反应温度的形成。在烷基和芳基取代的4-氯呋喃酮对醌的制备中也证明了该方案的合成应用。