An improved process for the manufacture of fexofenadine is described in which a compound of formula (F): wherein R
2
represents COOH, COO—C
1-6
alkyl or CN; and R
3
represents hydrogen, mesylate, triflate, tosylate or carboxy-C
1-6
-alkyl, or a salt thereof is prepared by: (I) reacting a compound of formula (B): wherein R1 represents hydrogen or carboxy-C
1-6
-alkyl; and R
2
is a hereinbefore defined, with a copper and/or silver compound in the presence of palladium or a compound thereof to yield a compound of formula (C): wherein R
1
, and R
2
are as hereinbefore defined; (II) converting said compound of formula (C) into a compound of formula (E): wherein R
2
and R
3
are as hereinbefore defined and R
4
represents a halogen atom, and (III) reacting said compound of formula (E) with azacyclonol.
A new synthesis of carboxyterfenadine (fexofenadine) and its bioisosteric tetrazole analogs
作者:Barbara Di Giacomo、Donato Coletta、Benedetto Natalini、Ming-Hong Ni、Roberto Pellicciari
DOI:10.1016/s0014-827x(99)00070-1
日期:1999.9
A new synthesis of carboxyterfenadine (4), based on the conversion of a alpha-halo-alkylarylketone into the corresponding substituted 2-arylalkanoic ester, is described. The enantioselective synthesis of its two bioisosteric tetrazoleanalogs together with preliminary biological results are reported.