Reactions of the monoxides of 2, 6??disubstituted pyrazines with phosphoryl chloride and acetic anhydride

~%

~%

~65%

~%

~%

~%

~%

~30%

~%

~78%

~%

~95%

~%

~%

~%

~%

~22%

~%

~%

~%

~29%

~89%

~%

~%

~11%

~%

~93%

~%

~94%

~14%

~85%

~%

~%