申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0283152A2
公开(公告)日:1988-09-21
A process for preparing a compound of formula (I) which comprises
or a salt, acylate or sulphonate derivative thereof; wherein R¹ is an optionally substituted aryl group, R², R³, R⁴ and R⁵ are selected from hydrogen, C₁₋₄ alkyl, C₁₋₄ alkanoyl or -CO₂Rª wherein Rª is C₁₋₄ alkyl or R² and R³ or R⁴ and R⁵ together with the carbon atom to which they are attached form a C₃₋₆ cycloalkyl ring, provided that at least R² and R³ or R⁴ and R⁵ are not both hydrogen and that not more than two of R², R³, R⁴ and R⁵ are C₁₋₄ alkanoyl or -CO₂Rª; which process comprises either;
a) reacting a compound of formula (II)
wherein R², R³, R⁴ and R⁵ are as defined in relation to formula (I) with a compound of formula (III):
R¹COCN (III)
wherein R¹ is as defined in relation to formula (I) in the presence of a base and a Lewis acid; or
b) reacting a compound of formula (VI)
with a compound of formula (X)
wherein R¹ is as hereinbefore defined, in the presence of a Lewis acid; or
c) where R², R³, R⁴ and R⁵ are the same, reacting a compound of formula (XI)
with a compound of formula R²X¹ in the presence of a base, wherein X¹ is a leaving group.
Certain compounds of formula (I) are novel and these and their use as herbicides form another aspect of the invention.
一种制备式(I)化合物的工艺,其包括
或其盐、酰基酸盐或磺酸盐衍生物;其中 R¹ 是任选取代的芳基,R²、R³、R⁴ 和 R⁵ 选自氢、C₁₋₄ 烷基C₁₋₄ 烷酰基或-CO₂Rª,其中 Rª 是 C₁₋₄ 烷基或 R² 和 R³ 或 R⁴ 和 R⁵ 与它们所连接的碳原子一起形成 C₃₋₆ 环烷基环、但至少 R² 和 R³ 或 R⁴ 和 R⁵ 不能都是氢,且 R²、R³、R⁴ 和 R⁵ 中不能有两个以上是 C₁₋₄ 烷酰基或 -CO₂Rª;该工艺包括
a) 使式(II)化合物反应
其中 R²、R³、R⁴ 和 R⁵ 如式(I)所定义,与式(III)化合物反应:
R¹COCN (III)
其中 R¹ 如式 (I) 所定义,在碱和路易斯酸存在下;或
b) 式(VI)化合物与式(X)化合物反应
与式 (X) 的化合物反应
其中 R¹ 如前定义,在路易斯酸存在下;或
c) 当 R²、R³、R⁴ 和 R⁵ 相同时,使式 (XI) 化合物与式 R²X 的化合物反应
与式 R²X¹ 的化合物在碱存在下反应,其中 X¹ 为离去基团。
某些式(I)化合物是新颖的,这些化合物及其作为除草剂的用途构成了本发明的另一个方面。