Corner opening of cyclopropanes by mercury(II) and thallium(III) and transmetalation of the intermediate organomercurials. A novel, stereoselective approach to cyclobutanes and cyclopropanes
作者:Pavel Kocovsky、Jiri Srogl、Milan Pour、Adolf Gogoll
DOI:10.1021/ja00080a021
日期:1994.1
compared, and further evidence for the exclusive corner selectivity for Hg2+ is provided by isotope labeling. Cleavage of cyclopropyl derivative 1 with Hg(NO3)2, followed by KBr quenching, afforded the stable, rearranged organomercurial 3, whose transmetalation has been studied. Whereas reaction of 3 with Pd(I1) afforded lactol 4, treatment with MezCuLi resulted in the formation of cyclobutanol derivative
比较了两种等电子阳离子(Hg2+ 和 TP )对环丙烷环的反应性,同位素标记提供了 Hg2+ 唯一角选择性的进一步证据。用 Hg(NO3)2 裂解环丙基衍生物 1,然后用 KBr 淬灭,得到稳定的、重排的有机汞 3,其金属转移作用已被研究。而 3 与 Pd(I1) 反应得到乳醇 4,用 MezCuLi 处理导致形成环丁醇衍生物 (3 - 29);类似的共轭加成也已完成 (32 - 35)。类似地,从 Hg(I1) 介导的开环中作为主要产物从 21 获得的有机汞 22 与 MezCuLi 或 AlCl3 反应得到闭环产物 21。这些反应代表了立体选择性构建四元环和三元环的新方法。这些转化的关键步骤的立体化学已经通过使用立体有择的氘化底物 lb、3b、21b 和 22b 建立。