Process for converting 2,4-dichloropyridines into 2-aryloxy-4-chloropyridines
 This invention relates to a process for converting 2,4-dichloropyridines into 2-aryloxy-4-chloropyridines, comprising reacting a compound of formula (I), wherein R.sup.1 is (C.sub.1 -C.sub.4)alkyl; R.sup.2 is methyl or ethyl; and R.sup.3, R.sup.4 and R.sup.5 are selected, independently, from (C.sub.1 -C.sub.4)alkyl and (C.sub.1 -C.sub.4)alkoxy; or a pharmaceutically acceptable salt thereof; comprising reacting a compound of formula (II), wherein R.sup.1 and R.sup.2 are defined as above, with a compound of formula (III), wherein R.sup.3, R.sup.4 and R.sup.5 are defined as above, in the presence of a base that is capable of deprotonating the compound of formula (III), optionally in the presence of an organometallic halide or oxide and a suitable solvent, and then optionally converting the resulting compound of formula (I) into a pharmaceutically acceptable salt of such compound. ##STR1## 
Pfizer Inc.
C
C07D
inventional
Yuhpyng L. Sally Gut
Chen Ruggeri