| abstract |
There is provided a compound of formula (I) wherein A is selected from —O— and —S—; X is selected from C 2 -C 8 alkyl, C 2 -C 8 alkenyl, C 3 -C 8 cycloalkyl and C 4 -C 8 cycloalkylalkyl, each of which may be optionally substituted with up to 3 substituents each independently selected from halo, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 1 -C 4 alkyl-S(O) n — where n is 0, 1 or 2 , —CF 3 , —CN and —CONH 2 ; Y is selected from phenyl, naphthyl, dihydrobenzothienyl, benzothiazolyl, benzoisothiazolyl, quinolyl, isoquinolyl, naphthyridyl, thienopyridyl, indanyl, 1,3 -benzodioxolyl, benzothienyl, indolyl and benzofuranyl, each of which may be optionally substituted with up to 4 or, where possible, 5 substituents each independently selected from halo, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 1 -C 4 alkyl-S(O) n — where n is 0, 1 or 2 , nitro, acetyl, —CF 3 , —SCF 3 and cyano; and when Y is indolyl it may be substituted or further substituted by an N-substituent selected from C 1 -C 4 alkyl; Z is selected from H, OR 3 or F, wherein R 3 is selected from H, C 1 -C 6 alkyl and phenyl C 1 -C 6 alkyl; R 1 and R 2 are each independently H or C 1 -C 4 alkyl; with the proviso that, when Z is H, then Y may not be optionally substituted phenyl or optionally substituted naphthyl. |