Disclosed are compounds of Formula 1, including all stereoisomers, N-oxides, and salts thereof, Wherein A, R1, R2 and R3 are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound or a composition of the invention.所揭示者係式1之化合物(包括所有立體異構物)、其N-氧化物及鹽,其中A、R1、R2、及R3係如本揭露中所定義。亦揭露者係含式1之化合物之組成物與用於防治非所欲植被之方法,該方法包含使該非所欲植被或其環境與有效量之本發明化合物或組成物接觸。