Donor–Acceptor Cyclopropanes as 1,2-Dipoles in GaCl<sub>3</sub>-Mediated [4 + 2]-Annulation with Alkenes: Easy Access to the Tetralin Skeleton
作者:Roman A. Novikov、Anna V. Tarasova、Victor A. Korolev、Evgeny V. Shulishov、Vladimir P. Timofeev、Yury V. Tomilov
DOI:10.1021/acs.joc.5b01179
日期:2015.8.21
A new process for (4 + 2)-annulation of donor–acceptorcyclopropanes (DACs) with unsaturated compounds in the presence of anhydrous GaCl3 has been developed. In this process, DACs act as sources of formal1,2- and 1,4-dipoles to give polysubstituted tetralins in high yields and with high regio- and diastereoselectivity. Alkenes with both aryl and alkyl substituents at the double bond undergo this reaction
Lewis Acid-Catalyzed Isomerization of 2-Arylcyclopropane-1,1-dicarboxylates: A New Efficient Route to 2-Styrylmalonates
作者:Alexey O. Chagarovskiy、Olga A. Ivanova、Eduard R. Rakhmankulov、Ekaterina M. Budynina、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1002/adsc.201000636
日期:2010.12.17
A facile efficient approach to the 2-styrylmalonates via the Lewis acid-catalyzedisomerization of 2-arylcyclopropane-1,1-dicarboxylates has been developed. The efficiency of this method was demonstrated for a representative series of such cyclopropanes. The isomerization proceeds chemo-, regio- and stereoselectively to afford E-styrylmalonates in good yields.