申请人:Syngenta Crop Protection, Inc.
公开号:US06207830B1
公开(公告)日:2001-03-27
Aryl- or heteroaryluracils of formula I
wherein R1 signifies methyl or ethyl; R2 signifies —CF3, —CClF2, —CCl2F, or —C2F5; and Q is an aryl or heteroaryl group; are produced whereby a compound of formula II
O═C═N—Q (II)
is reacted at a temperature of −5° C. to +40° C. with an enamine of formula III
wherein R19 signifies C1-C6-alkyl, in the presence of a solvent and of 0.1 to 0.4 equivalents of a base with respect to the employed enamine of formula III. The compounds of formula I are useful as herbicides. An example of the compounds of formula I is 2-chloro-5-(3,6-dihydro-2,6-dioxo-3-methyl-4-trifluoromethyl-1-(2H)pyrimidinyl)-benzoic acid 1-aalyloxycarbonyl-1-methyl-ethyl-ester.
公式I中,Aryl-或heteroaryluracils,其中R1表示甲基或乙基;R2表示—CF3,—CClF2,—CCl2F或—C2F5;而Q是芳基或杂芳基基团。这些化合物是通过在存在溶剂和0.1至0.4当量的碱的情况下,将公式II O═C═N—Q(II)化合物在温度为−5℃至+40℃的条件下与公式III的enamine反应而制得的,其中R19表示C1-C6-烷基。公式I的化合物可用作除草剂。公式I的化合物的例子是2-氯-5-(3,6-二氢-2,6-二氧代-3-甲基-4-三氟甲基-1-(2H)嘧啶基)-苯甲酸1-aalyloxycarbonyl-1-甲基-乙酯。