Chromium(0)-Promoted [6π + 2π] Cycloadditions of Allenes with Cycloheptatriene
作者:James H. Rigby、Stéphane B. Laurent、Zeeshan Kamal、Mary Jane Heeg
DOI:10.1021/ol802401a
日期:2008.12.18
Photoinitiated [6pi + 2pi] cycloadditions of allenes with (eta(6)-cycloheptatriene)tricarbonylchromium(0) (1) are described. An example of asymmetric induction obtained by reaction of 1 with a chiral 1,3-disubstituted allene is also reported.
Catalytic [6π+2π]-cycloaddition of alkynes, 1,2- and 1,3-dienes to 1,3,5-cycloheptatrienes involving Ti complexes
作者:Usein M. Dzhemilev、Gulnara N. Kadikova、Dmitry I. Kolokol'tsev、Vladimir A. D'yakonov
DOI:10.1016/j.tet.2013.04.019
日期:2013.6
Novel two-component Ti-based catalytic systems, R2TiCl2 R'nAlCl(3-n) (R=acac, (PrO)-Pr-i, (BuO)-Bu-t; R'=Et, Bu, n=2, 3), for [6 pi+2 pi]-cycloaddition of acetylenes and 1,2- and 1,3-dienes, including functionally substituted ones, to 1,3,5-cycloheptatrienes to give bi-, tri-, and polycyclic hydrocarbons were developed. (C) 2013 Elsevier Ltd. All rights reserved.
Ti-catalyzed [6π+2π] cycloadditions of allenes with 1,3,5-cycloheptatriene
作者:Vladimir A. D’yakonov、Gulnara N. Kadikova、Usein M. Dzhemilev
DOI:10.1016/j.tetlet.2011.03.131
日期:2011.5
The reaction between 1,2-dienes and 1,3,5-cycloheptatriene in the presence of the two-component catalyst, TiCl(4)-Et(2)AlCl leads to the regioselective formation of endo-bicyclo[4.2.1]nona-2,4-diene derivatives in yields of up to 80%. (C) 2011 Elsevier Ltd. All rights reserved.