The mild and efficient one-pot methods to synthesize substituted spirocyclopropanes and spirocyclobutanes are reported. The elaborated procedures based on consecutive cycloalumination of methylenecyclopropanes, methylenecyclobutanes or cycloalkynes assisted by alkyl aluminums and Cp2ZrCl2 as a catalyst provide the formation of target products through Pd catalyzed carbocyclization of the aluminacyclopentane
A facile synthesis of spiro macrocarbocycles via the cycloalumination reaction of cyclic alkynes and alkadiynes
作者:Vladimir A. D’yakonov、Regina A. Tuktarova、Leonard M. Khalilov、Usein M. Dzhemilev
DOI:10.1016/j.tetlet.2011.06.018
日期:2011.9
Zirconium-catalyzed cycloalumination of cycloalkadiynes assisted by Et3Al, subsequent treatment of the in situ generated tricyclic dialuminum compounds with BrCH2OMe and finally cyclopropanation of the obtained dispiro cyclopropyl dimethylene macrocarbocycles with Et3Al-CH2I2 represents an efficient one-pot synthetic approach to prepare di- and tetraspiro cyclopropane-containing macrocarbocycles in very high yields. (C) 2011 Elsevier Ltd. All rights reserved.
Cycloalumination of cycloalkynes with triethylaluminum catalyzed by zirconium complexes
作者:V. A. D’yakonov、L. F. Galimova、T. V. Tyumkina、U. M. Dzhemilev
DOI:10.1134/s1070428012010010
日期:2012.1
Cycloalumination of cycloalkynes with triethylaluminum in the presence of zirconium complexes was performed for the first time, and new bicyclic aluminacyclopentenes were obtained in 74-94% yield.