Base-catalyzed synthesis of 1-aryl-4-(aryl ethyl)piperazines from aromatic olefins and 1-arylpiperazines
申请人:Aventis Research & Technologies
公开号:US06313297B1
公开(公告)日:2001-11-06
A process for preparing a 1-aryl-4-(arylethyl)piperazine of the formula (I)
by reacting a 1-arylpiperazine of the formula (II)
with an aromatic olefin of the formula (III)
Ar′CR1═CHR2 (III)
in an inert solvent in the presence of at least one basic catalyst, where in the formulae (I) to (III)
Ar and Ar′ independently of one another are an aryl radical, selected from the group of the fused and unfused C6-C22-aromatics and the fused or unfused C5-C22-heteroaromatics which have at least one nitrogen, oxygen or sulfur atom in the ring; and
R1 and R2 independently of one another are a hydrogen atom, a C1-C8-alkyl radical or an aryl radical Ar.
Base-catalyzed hydroamination of aromatic olefins-an efficient route to 1-aryl-4-(arylethyl)piperazines
作者:Matthias Beller、Claudia Breindl
DOI:10.1016/s0040-4020(98)00295-6
日期:1998.6
An efficientsynthesis of pharmaceutically interesting 1-aryl-4-(arylethyl)piperazines by base-catalyzed hydroamination is presented. Starting from substituted aryl olefins and various N-arylpiperazines, the desired products 3 – 12 were obtained in one step under mild conditions in the presence of a catalytic amount of n-butyllithium in yields up to 99%.