BuLi—AlCl3—CH2I2 as a new reagent system for olefin cyclopropanation
作者:T. P. Zosim、F. T. Sadykova、I. R. Ramazanov、U. M. Dzhemilev
DOI:10.1007/s11172-022-3391-8
日期:2022.1
method for cyclopropanation of olefins with the BuLi—AlCl3—CH2I2 reagent system was developed. The reaction is tolerant of a wide range of unsaturated alkyl- and aryl-substituted hydrocarbons of linear and cyclic structure (octene-1, decene-1, tetradecene-1, styrene, 1-vinylnaphthalene, cyclohexene, cyclooctene, myrcene) and gives high yields (63–87%) of the corresponding cyclopropanation products.
开发了BuLi-AlCl 3 -CH 2 I 2试剂体系烯烃环丙烷化的新方法。该反应可耐受各种直链和环状结构的不饱和烷基和芳基取代烃(1-辛烯、1-癸烯、1-十四碳烯、苯乙烯、1-乙烯基萘、环己烯、环辛烯、月桂烯),并产生高产率(63-87%)相应的环丙烷化产物。涉及空间位阻烯烃(2-环丁基亚金刚烷、2,2'-双(金刚亚基))的反应以 40-45% 的产率产生含环丙烷的多环烃。
Facile preparation of cyclopropanes from 2-iodoethyl-substituted olefins and 1,3-dihalopropanes with zinc powder
作者:Daisuke Sakuma、Hideo Togo
DOI:10.1016/j.tet.2005.07.103
日期:2005.10
Two efficient, simple, cheap, and environmentally benign preparations of cyclopropanes were achieved. One is the formation via 3-exo-trig manner from various electron-deficient 2-iodoethyl-substituted olefins with zinc powder in a mixture of t-butyl alcohol and water, and the other is the formation via 3-exo-tet manner from various 1,3-dihalopropanes with zinc powder in ethanol.
Radical 3-exo-tet cyclization of 1,3-dihalopropanes with SmI2 to form cyclopropanes
作者:Tsuyoshi Ohkita、Yuhsuke Tsuchiya、Hideo Togo
DOI:10.1016/j.tet.2008.05.081
日期:2008.7
The preparation of 1,1-disubstituted and monosubstituted cycloproparres from corresponding 2,2-disubstituted and 2-monosubstituted 1,3-dihalopropanes, respectively, with SMI2 in THF was efficiently carried out. The reaction mechanism was proposed to proceed in a radical 3-exo-tet manner based on Baldwin's rule. (c) 2008 Elsevier Ltd. All rights reserved.