Fungicidal propenoic acid derivatives

A compound having the formula (I):

• ##STR11## or a stereoisomer thereof, wherein A is hydrogen, halo, hydroxy, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, C.sub.1-4 haloalkyl, C.sub.1-4 haloalkoxy, C.sub.1-4 alkylcarbonyl, C.sub.1-4 alkoxycarbonyl, phenoxy, nitro or cyano;
• R.sup.1 is heterocycloalkyl, heteroaryloxyalkyl, heteroaryl or heteroaryloxy wherein the heteroaryl or heterocyclyl moiety is a 5- or 6-membered ring containing one or more O, N or S heteroatoms optionally fused to a benzene ring;
• R.sup.2 is hydrogen, C.sub.1-6 alkyl, C.sub.3-6 cycloalkyl, C.sub.3-6 cycloalkyl(C.sub.1-4)alkyl, aryl(C.sub.1-4)alkyl, aryloxy(C.sub.1-4)-alkyl, C.sub.2-6 alkenyl, C.sub.2-6 alkynyl, C.sub.1-6 alkoxy, aryl, aryloxy, nitro, halo, cyano, --NR.sup.3 R.sup.4, --CO.sub.2 R.sup.3, --CONR.sup.3 R.sup.4, --COR.sup.3, --S(O).sub.n R.sup.3 or (CH.sub.2).sub.m PO(OR.sup.3).sub.2 wherein n is 0, 1 or 2, m is 0 or 1 and R.sup.3 and R.sup.4, which are the same or different, are hydrogen, C.sub.1-6 alkyl, aryl(C.sub.1-6)alkyl, C.sub.2-6 alkenyl, C.sub.2-6 alkynyl or aryl;
• any of the foregoing aryl moieties, which are phenyl or naphthyl, and any of the foregoing heterocyclyl or heteroaryl moieties being optionally substituted with one or more of halo, hydroxy, mercapto, C.sub.1-4 alkyl, C.sub.2-4 alkenyl, C.sub.2-4 alkynyl, C.sub.1-4 alkoxy, C.sub.2-4 alkenyloxy, C.sub.2-4 alkynyloxy, halo(C.sub.1-4)alkyl, halo(C.sub.1-4)alkoxy, C.sub.1-4 alkylthio, hydroxy(C.sub.1-4)alkyl, C.sub.1-4 alkoxy(C.sub.1-4)alkyl, C.sub.3-6 cycloalkyl, C.sub.3-6 cycloalkyl(C.sub.1-4)alkyl, phenyl, pyridyl, pyrimidinyl, phenoxy, pyridyloxy, pyrimidinyloxy, phenyl(C.sub.1-4)alkyl in which the alkyl moiety is optionally substituted with hydroxy, pyridyl- or pyrimidinyl(C.sub.1-4)-alkyl, phenyl(C.sub.2-4)alkenyl, pyridyl- or pyrimidinyl-(C.sub.2-4)alkenyl, phenyl(C.sub.1-4)alkoxy, pyridyl- or pyrimidinyl(C.sub.1-4)alkoxy, phenoxy(C.sub.1-4)alkyl, pyridyloxy- or pyrimidinyloxy(C.sub.1-4)alkyl, C.sub.1-4 alkanoyloxy, benzoyloxy, cyano, thiocyanato, nitro, --NR'R", --NHCOR', --NHCONR'R", --CONR'R", --COOR', --OSO.sub.2 R', --SO.sub.2 R', --COR', --CR'.dbd.NR" in which R' and R" are independently hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, C.sub.1-4 alkylthio, C.sub.3-6 cycloalkyl, C.sub.3-6 cycloalkyl(C.sub.1-4)alkyl, phenyl or benzyl, the phenyl and benzyl groups being optionally substituted with halogen, C.sub.1-4 alkyl or C.sub.1-4 alkoxy;
• and any of the foregoing phenyl, pyridyl or pyrimidinyl substituents themselves being optionally substituted with one or more of halo, hydroxy, mercapto, C.sub.1-4 alkyl, C.sub.2-4 alkenyl, C.sub.2-4 alkynyl, C.sub.1-4 alkoxy, C.sub.2-4 alkenyloxy, C.sub.2-4 alkynyloxy, halo(C.sub.1-4)alkyl, halo(C.sub.1-4)alkoxy, C.sub.1-4 alkylthio, hydroxy(C.sub.1-4)alkyl, C.sub.1-4 alkoxy(C.sub.1-4)alkyl, C.sub.3-6 cycloalkyl, C.sub.3-6 cycloalkyl(C.sub.1-4)alkyl, alkanoyloxy, benzoyloxy, cyano, thiocyanato, nitro, --NR'R", --NHCOR', --NHCONR'R", --CONR'R", --COOR', --SO.sub.2 R', --OSO.sub.2 R', --COR', --CR'.dbd.NR" or --N.dbd.CR'R" in which R' and R" have the meanings given above.