3-Polyfluoroalkyl-substituted E-cinnamic acids: easy access via Perkin reaction
作者:Dmitri V Sevenard
DOI:10.1016/s0040-4039(03)01830-6
日期:2003.9
3-Polyfluoroalkyl-(E)-cinnamic acids being very useful building blocks were obtained by a simple and convenient one-step procedure. The Perkin type reaction of fluoroacyl-substituted arenes gives the titled compounds in good yields and excellent stereoselectivity independent on the electronic nature of substituents in the aromatic ring. In the case of fluoroalkyl–alkylketones only O-acylation occures
A compound having the formula:
1
[wherein Ar
1
represents a phenyl which may be substituted, Ar
2
represents a phenyl which may be substituted or a heterocyclic group which may be substituted, R
0
represents a hydrogen atom or a lower alkyl; R
1
represents a lower alkyl; R
2
to R
5
represent a hydrogen atom or an alkyl which may be substituted with halogen, n represents
0
to
2;
p represents
0
or
1;
q, r and s represent
0
to
2;
A represents a
4
- to
7
-membered carbon ring or a
4
- to
7
-membered heterocyclic group].
The compound of the present invention exhibits excellent antifugal activities.