Aluminium triflate-catalysed regioselective cycloisomerisation of non-activated unsaturated oximes
摘要:
A novel cycloisomerisation of oximes bearing non-activated C-C double bonds occurs in an Al(III)-catalysed reaction. This process leads to 5-,6- and 7-membered ring oxygen and nitrogen-containing heterocycles in good yields. (C) 2008 Elsevier Ltd. All rights reserved.
New aspects of nitrosation of arylcyclopropanes: nitrosation of phenylcyclopropanes with bulky alkyl substituents in the small ring
作者:O. B. Bondarenko、A. Yu. Gavrilova、L. G. Saginova、N. V. Zyk、N. S. Zefirov
DOI:10.1007/s10593-009-0184-z
日期:2008.10
It has been shown for the first time that nitrosation of phenylcyclopropanes with bulky alkyl substituents in the small ring proceeds predominantly with attack of the nitrosonium cation on the benzyl carbon atom of the cyclopropane ring with intermediate formation of an alkyl carbocation. In addition to isoxazolines, 1,2-oxazines and Delta(1)-pyrroline N-oxide are formed, formation of the latter is preceded by skeletal rearrangement.
Aluminium triflate-catalysed regioselective cycloisomerisation of non-activated unsaturated oximes
A novel cycloisomerisation of oximes bearing non-activated C-C double bonds occurs in an Al(III)-catalysed reaction. This process leads to 5-,6- and 7-membered ring oxygen and nitrogen-containing heterocycles in good yields. (C) 2008 Elsevier Ltd. All rights reserved.