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.
Isoxazoline Derivatives and Their Use as Herbicides
申请人:Plant Andrew
公开号:US20080139390A1
公开(公告)日:2008-06-12
Compounds of formula (I) wherein the substituents are as defined in claim
1
, are suitable for use as herbicides. Also claimed is a process for the preparation of compounds of the formula I, wherein m is 2 and n is 1, and the other substituents are defined as in claim
1
, formula (Ia) by reacting a compound of the formula Ia in a single step or stepwise in succession with compounds of the formula R
5
—X and/or R
6
—X, wherein R
5
and R
6
are as defined in claim
1
, and X is a leaving group, and a process for the preparation of compounds of the formula I, wherein R
6
is C
1
-C
10
alkyl or halogen, m is 2 and n is 1, and the other substituents are defined as in claim
1
, formula (Ib) by reacting a compound of the formula Ib with a compound of the formula R
5
—X, wherein R
5
is as defined in claim
1
, and X is a leaving group, and a process for the preparation of compounds of the formula I, wherein R
5
is chlorine, bromine or iodine, m is 1 or 2, and n is 1, and the other substituents are defined as in claim
1
, formula (Ic) by reacting a compound of the formula 1e with an N-halosuccinimide and an oxidising agent.
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.