Process for manufacturing triazinon-benzoxazinones

A process for manufacturing a compound of formula (I),

• wherein
• R1 is H or halogen;
• R2 is halogen;
• R3 is H or halogen;
• R4 is H, C1-C6-alkyl, C1-C6-haloalkyl, C3-C6-cycloalkyl, C3-C6-alkenyl, C3-C6-haloalkenyl, C3-C6-alkynyl, C3-C6-haloalkynyl, C1-C6-alkoxy or C3-C6-cycloalkyl-C1-C6-alkyl;
• R5 is H or C1-C6-alkyl;
• R6 is H or C1-C6-alkyl;
• W is O or S;
• and
• Z is O or S;
• wherein a compound of formula (II),
• wherein R1, R2, R3, R4 and W are defined as in formula (I);
• is reacted with 1,1′-carbonyldiimidazole (CDI) and a compound of formula (III),
• wherein R5, R6 and Z are defined as in formula (I).