The invention relates to a compound of formula (I):
wherein:
A represents pyridine, pyridinium or piperidine
R1, R2, R3 and R4 are as defined in the description
R5 represents hydrogen, a nitrogen-containing heterocycle or a group of
R6 represents hydrogen or linear or branched (C1-C6)alkyl.
and medicinal products containing the same which are useful in treating pain or deficiencies in memory.
The invention relates to a compound of formula (I):
1
wherein
A represents pyridine, pyridinium or piperidine
R
1
, R
2
, R
3
and R
4
are as defined in the description
R
5
represents hydrogen, a nitrogen-containing heterocycle or a group of formula (II):
2
R
6
represents hydrogen or linear or branched (C
1
-C
6
)alkyl.
and medicinal products containing the same which are useful in treating pain or deficiencies in memory.
Pseudo Vilsmeier reagents a new protocol for regiospecific CC bond formation in pyridines
作者:Chu-Yi Yu、David L. Taylor、Otto Meth-Cohn
DOI:10.1016/s0040-4039(99)01340-4
日期:1999.9
2-Fluoro- and 2,6-difluoropyridine are readily quaternised with methyl p-toluenesulfonate and methyl triflate respectively These salts readily undergo substitution of fluorine by enamines, the difluoro-derivatives being capable of specific mono- or disubstitution in a symmetrical or unsymmetrical manner. The products reduced to give keto-1,2, 3, 6-tetrahydropyridines, can lie hydrolysed to the corresponding ketopyridines or hydrogenated to give ketopiperidines. (C) 1999 Elsevier Science Ltd. All rights reserved.
Composés pyridiniques ou pipéridiniques substitués pour le traitement des maladies neurodégénératives