There is provided a process for the production a compound of general formula I: ##STR1## wherein A, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have meanings given in the description, which process comprises the reaction of a compound of formula II, ##STR2## wherein R.sup.x is a group substitutable by an aminopyrazole, with a compound of general formula III ##STR3##
This application is filed claiming priority from co-pending Provisional Application Nos. 60/217,769 filed Jul. 12, 2000 and 60/291,100 filed May 16, 2001.
Priority Data
Jun 22, 2000 [GB] 0015472 Mar 09, 2001 [GB] 0105857