Synthesis of pyrazolinylnaphthalic acid derivatives
申请人:——
公开号:US20010012905A1
公开(公告)日:2001-08-09
The invention pertains to a method for preparing derivatives of the pyrazolinylnaphthalic acid having the general formula
1
where Ar
1
and Ar
2
are unsubstituted or substituted phenyl radicals bearing in the para position an alkylated or acylated oxy- or amino group, or a polynuclear aryl radical, and Ar
3
is a substituted N-naphthalimid or 1,8-naphthylene-1′,2′-benzimidazole. Compounds ofthe above general formula are high-efficient red organic luminophors and are used widely as luminescent components of dyes for plastics and liquid scintillators, in hydrogeology to study water streams, to label the chemical industry wastewaters, as laser dyes, etc.
Treatment of stilbene and acenaphthylene derivatives with Mg turnings in the presence of aliphatic acid anhydrides and trimethylsilyl chloride (TMSCl) in N,N-dimethylformamide (DMF) brought about a facile and efficient cross-coupling to give C-acylation products in moderate to good yields. The reaction may be initiated by electron transfer from magnesium to the carbon-carbon double bonds of the substrates