Appeal 2007-0549
Application 10/399,312
wherein Y represents -O-, -S- or -N(R2)-,
R2 being hydrogen, C1-C10alkyl or aralkyl;
Z represents a 2,5-furanyl, 2,5-thiophenyl, 4,4'-stilbenyl or a
1,2-ethylenyl residue and
R1 represents hydrogen, halogen, C1-C10alkyl, C1-C10alkoxyl,
cyano, COOM or SO3M, M being hydrogen or an alkaline or
alkaline earth metal,
which comprises reacting a compound of the formula
with a dicarboxylic acid of the formula
or an ester thereof,
Y, Z and R1 being as previously defined,
in N-methylpyrrolidone or N,N-dimethylacetamide, in the
presence of an acidic catalyst and, optionally, in the presence of
a secondary solvent capable of removing water from the
reaction mixture.
Thus, claim 1 is directed to a process of producing a bis-benzazolyl
compound of formula (1) by reacting a compound of formula (2) with a
dicarboxylic acid of formula (3) and an acidic catalyst, in either N-
methylpyrrolidone or N,N-dimethylacetamide.
2. PRIOR ART
The Examiner relies on the following references:
3
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Last modified: September 9, 2013