Sulfonylurea derivatives of formula
wherein
B is a substituted thienyl or pyridyl group;
W is O or S;
R is H or CH3; and
A is a mono- or bicyclic heterocyclic group, e.g. pyrimidinyl or triazinyl;
and their agriculturally suitable salts, exhibit potent herbicidal activity. Some also show a plant growth regulant effect.
The novel compounds may be formulated into compositions for agricultural use in conventional manner. They may be made by a variety of synthetic routes, e.g. by reacting an appropriate sulfonyl isocyanate or isothiocyanate of formula BNCW with an appropriate heterocyclic amine HNR.A.
式中 B 是取代的
噻吩基或
吡啶基;W 是 O 或 S;R 是 H 或
CH3;A 是单环或双环杂环基团,如
嘧啶基或三嗪基;以及它们的农用适 宜盐的磺酰
脲衍
生物具有强效除草活性,有些还显示出
植物生长调节剂的作用。 这些新型化合物可按常规方法配制成农用组合物。 它们可通过多种合成路线制得,如将式 BNCW 的适当磺酰基
异氰酸酯或异
硫氰酸酯与适当的杂环胺 HNR.A 反应。