Synthesis of Novel Herbicidal Sulfonylurea Compounds with Imidazo [1, 2-<i>a</i>] pyridine Moiety

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  • ISHIDA Yasuo
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries Ltd.
  • OHTA Kazunari
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries Ltd.
  • ITOH Shigeyuki
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries Ltd.
  • NAKAHAMA Tatsuo
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries Ltd.
  • MIKI Hideki
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries Ltd.
  • YOSHIKAWA Harutoshi
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries Ltd.

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Other Title
  • イミダゾ [1,2-<i>a</i>] ピリジン部分を有する除草活性化合物新規スルホニル尿素の合成
  • イミダゾ〔1,2-a〕ピリジン部分を有する除草活性化合物新規スルホニル尿素の合成〔英文〕
  • イミダゾ 1 2 a ピリジン ブブン オ ユウスル ジョソウ カッセイ カゴ
  • Studies on Sulfonylureas with Fused Heterocycles (Part1)

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Abstract

A new series of sulfonylureas with an imidazo [1, 2-a] pyridine moiety bonded to the sulfonyl group were synthesized and their herbicidal activity was examined. Some of these compounds showed potent activity against many kinds of paddy weeds as well as safety to rice plants. Among them, 1-(2-chloroimidazo [1, 2-a] pyridin-3-ylsulfonyl)-3-(4, 6-dimethoxypyrimidin-2-yl) urea (1g, code No. TH-913) was selected for further evaluation, because it effectively controlled weeds at a rate of 0.5-1.0 g a. i./a with good rice selectivity in outdoor tests.

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