Novel 3-amino-2-alkenylimidates of the formula
and the monohydrochloride and dihydrochloride thereof, wherein
X is 0 or S,
R is alkyl, alkoxyalkyl or haloalkyl,
R1 is H or alkyl,
R2 is H or alkyl,
may be reacted with cyanamide or cyanogen chloride to yield novel cyanoimidates of the formula
which in turn readily cyclize to pyrimidines of formula
Both the pyrmidines and the cyanoimidates react with arylsulfonyl isocyanates to yield sulfonylurea herbicides.
新颖的 3-
氨基-2-烯
亚胺酸盐式
及其单盐酸盐和二盐酸盐,其中
X 是 0 或 S
R 是烷基、烷氧基烷基或卤代烷基、
R1 是 H 或烷基
R2 是 H 或烷基、
可与
氰酰胺或
氯化氰反应,生成式如下的新型
氰亚胺酸盐
进而容易环化为式
嘧啶和
氰亚胺酸盐都可与芳基磺酰基
异氰酸酯反应,生成
磺酰脲类除草剂。