| abstract |
Compounds of formula (I), where A is NH or O; X is N or CH; R2 is hydrogen or alkyl; R?3 and R4¿, which may be the same or different, are alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, alkoxy, alkylthio, phenyl or heterocyclyl, each of which is optionally substituted, hydrogen, cyano, a group -COR20 or a group -C(R?21)=N-OR22¿, with the proviso that R?3 and R4¿ are not simultaneously hydrogen; or R?3 and R4¿, together with the carbon atom to which they are attached, form an optionally substituted 5- to 7-membered ring optionally including one to three heteroatoms selected from N, O and S; R20 is alkyl, cycloalkyl, phenyl, heterocyclyl or amino, each of which is optionally substituted, or is hydrogen; R21 has the same meaning as R20 and may also be cyano; and R22 has the same meaning as R20 and may also be -COR20, have activity as fungicides. |