N3-substituted-N1-sulfonyl-5-fluoropyrimidinone derivatives

wherein R1 is:

• H
• R2 is:
• C1-C6 alkyl optionally substituted with R4;
• benzyl optionally substituted with 1-3 R5
• R3 is —S(O)2R6;
• R4 is independently halogen, C1-C6 alkyl, C1-C4 haloalkyl, C1-C4 alkoxy, C1-C4 haloalkoxy, C1-C4 alkylthio, C1-C4 haloalkylthio, amino, C1-C3 alkylamino, C2-C6 alkoxycarbonyl, C2-C6 alkylcarbonyl, C2-C6 alkylaminocarbonyl, hydroxyl, or C3-C6 trialkylsilyl;
• R5 is independently halogen, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkoxy, C1-C6 haloalkoxy, C1-C6 alkylthio, C1-C6 haloalkylthio, amino, C1-C6 alkylamino, C2-C6 dialkylamino, C2-C6 alkoxycarbonyl, or C2-C6 alkylcarbonyl, nitro, hydroxyl, or cyano;
• R6 is C1-C6 alkyl, C1-C6 haloalkyl, amino, C1-C6 alkylamino, C2-C6 dialkylamino, a phenyl or benzyl wherein each of the phenyl or the benzyl may be optionally substituted with 1-3 R5, or a 5- or 6-membered saturated or unsaturated ring containing 1-3 heteroatoms wherein each ring may be optionally substituted with 1-3 R5.