Lithium iodide promoted rearrangement of double activated alkenylcyclopropanes to cyclopentenes or 1,3-dienes
摘要:
Heating of bicyclic alkenylcyclopropanes 2a-g in DMF with LiI results in good yields of cyclopentenes or conjugated dienes depending on a substrate structure.
Simple synthesis of substituted 3-oxabicyclo[3.1.0]hexan-2-ones and their rearrangement in the presence of lithium iodide
作者:A. N. Kasatkin、A. N. Kulak、R. Kh. Biktimirov、G. A. Tolstikov、O. V. Shitikova、V. R. Sultanmuratova
DOI:10.1007/bf01150902
日期:1992.4
2-Alkenylidenemalonic ester monoepoxides react with organolithium and organomagnesium compounds to give 1-ethoxycarbonyl-4-alkyl-6-alkenyl(alkyl, aryl, alknyl)-3-oxabicyclo[3.1.0]hexan-2-ones in high yields. The latter, when an alkenyl fragment is present, undergo rearrangement in the presence of LiI to substituted 1-ethoxycarbonyl-3-oxabicyclo[3.3.0]-6-octen-2-ones or 3-(1,3-butadienyl)-4-butanolides.