Heterosubstituted cyclopropanation of alkenes with organochromium reagents derived from heterosubstituted dihalomethanes, CrCl2, and tetraalkylethylenediamine
作者:Kazuhiko Takai、Shota Toshikawa、Atsushi Inoue、Ryo Kokumai、Masato Hirano
DOI:10.1016/j.jorganchem.2006.06.047
日期:2007.1
stereoselectively from terminal alkenes by treatment with a reagent derived from iodoform, chromium(II) chloride, and TEEDA (N,N,N′,N′-tetraethylethylenediamine) in THF. Similarly, cyclopropylsilanes and cyclopropylboronic esters are obtained by using R3SiCHI2, and a combination of Cl2CHB(OR)2 and LiI instead of iodoform, respectively. The heterocyclopropanation occurs selectively at terminal double bonds, and
的Iodocyclopropanes反式构型立体选择性地被从末端烯烃通过处理产生与来自碘仿衍生的试剂,铬(II),氯化和TEEDA(Ñ,Ñ,Ñ ',Ñ '-tetraethylethylenediamine)的THF溶液。类似地,通过使用R 3 SiCHI 2和Cl 2 CHB(OR)2的组合获得环丙基硅烷和环丙基硼酸酯和LiI分别代替碘仿。杂环丙烷化选择性地在末端双键处发生,并且相同分子中的二取代和三取代的双键保持不变。诸如醇,醚,甲硅烷基醚,酯,叔胺和酰胺基团的官能团与反应条件相容。