申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0046677A2
公开(公告)日:1982-03-03
Compounds of the formula:
(wherein A is an unsubstituted or substituted phenyl, phenoxy, pyridyl, furyl or thienyl group; W is 0 or S; X is CH3'C2H5, Cl, OCH3, OC2H6, N(CH3)2 or SCH3; Y is H, CH3 or C2H5 and Z is H or CH3) and the agriculturally suitable salts thereof possess herbicidal activity. They are also of interest as plant growth regulants and may be used to modify plant growth beneficially as well as to selectively control weeds in crops such as wheat, barley, cotton and soybeans. The compounds may be formulated for use in conventional manner.
The compounds may be prepared by a variety of processes e.g. by reacting an appropriately substituted isocyanate or isothiocyanate with an appropriately substituted furo [2,3-d]pyrimidine amine. The furo [2,3-d] pyrimidine amines may be prepared by reaction of an appropriate keto-ester with guanidine carbonate or by reaction of an appropriate dichloropyrimidine with an alkali metal hydroxide.
Compounds corresponding to formula I but in which A represents a benzyl, furyl or thienyl group substituted by a carboxyl or carboxylic acid salt moiety are novel intermediates.
式中的化合物:
(其中 A 是未取代或取代的苯基、苯氧基、吡啶基、呋喃基或噻吩基;W 是 0 或 S;X 是 CH3'C2H5、Cl、OCH3、OC2H6、N(CH3)2 或 SCH3;Y 是 H、CH3 或 C2H5,Z 是 H 或 CH3)及其农业上适用的盐类具有除草活性。作为植物生长调节剂,它们也具有重要意义,可用于有益地改变植物生长,以及选择性地控制小麦、大麦、棉花和大豆等作物中的杂草。这些化合物可按常规方法配制使用。
这些化合物可以通过多种工艺制备,例如,将适当取代的异氰酸酯或异硫氰酸盐与适当取代的呋喃 [2,3-d]嘧啶胺反应。呋喃[2,3-d]嘧啶胺可通过适当的酮酯与碳酸胍反应或适当的二氯嘧啶与碱金属氢氧化物反应制备。
对应于式 I 但其中 A 代表被羧基或羧酸盐基取代的苄基、呋喃基或噻吩基的化合物是新型中间体。