Therapeutic phenoxyalkylpyridazines and intermediates therefor

A compound of formula:

• ##STR51## wherein:
• Y is an alkylene bridge of 3-9 carbon atoms;
• R.sub.1 and R.sub.2 are each independently chosen from hydrogen, halo, alkenyl, alkyl, alkenyl, alkyenylamino, alkylthio, hydroxyhaloalkyl, hydroxy, hydroxyalkyl, alkoxyalkyl, alkylthioalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl, alkoxy, nitro, carboxy, alkoxycarbonyl, aminoalkyl, alkylaminoalkyl, dialkylaminoalkyl, cyanomethyl, difluoromethyl, trifluoromethyl or cyano;
• R.sub.3 is hydrogen, alkyl, alkoxy, hydroxy, cycloalkyl, hydroxyalkyl, hydroxyhaloalkyl, alkoxyalkyl, hydroxyalkoxy, alkylthioalkyl, alkanoyl, alkanoyloxy, alkylsulfinylalkyl, alkylsulfonylalkyl, aminoalkyl, alkylaminoalkyl, dialkylaminoalkyl, alkoxycarbonyl, carboxy, cyanomethyl, fluoroalkyl, cyano, phenyl, alkynyl, alkenyl, or halo;
• R.sub.4 is hydrogen or halo;
• and
• R.sub.5 is alkoxycarbonyl, phenyl, or substituted phenyl wherein the substitution is with alkyl, alkoxyalkyl, cycloalkyl, haloalkyl, hydroxyalkyl, alkoxy, hydroxy, halo, furyl, thienyl, fluoroalkyl;
• or a pharmaceutically acceptable acid addition salt thereof.