申请人:Bayer Aktiengesellschaft
公开号:EP3666759A1
公开(公告)日:2020-06-17
The present invention relates to a process for preparing compounds of formula (I)
wherein R represents C1-C2-alkyl and X represents chlorine or bromine, by reacting a compound of formula (II)
wherein R is defined as in formula (I), in a first step A) with a dehydroxyhalogenation agent selected from COCl2, (COCl)2, cyanuric chloride, SOCl2, SO2Cl2, PCl3, PCl5, POCl3, PBr3, SOBr2 and SO2Br2 to arrive at a compound of formula (III)
wherein X and R are defined as in formula (I), and the compound of formula (III) is reacted in step B) with a malonate of formula (IV)
wherein R1 represents C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, C3-C8-cycloalkyl or benzyl; in presence of a base and a magnesium compound to arrive at a compound of formula (V)
wherein X and R are defined as in formula (I); and R1 is defined as in formula (IV); and decarboxylating the compound of formula (V). Optionally the resulting compound of formula (I) is further reacted to a triazole derivative of formula (VIII)
It further relates to the compounds of formula (V).
本发明涉及一种制备式 (I) 化合物的工艺
其中 R 代表 C1-C2- 烷基,X 代表氯或溴,通过反应式 (II) 的化合物
其中 R 的定义如式 (I),在第一步 A) 中与选自 COCl2、(COCl)2、三聚氯氰酰氯、SOCl2、SO2Cl2、PCl3、PCl5、POCl3、PBr3、SOBr2 和 SO2Br2 的脱羟基卤化剂反应,得到式 (III) 化合物。
其中 X 和 R 的定义同式(I),式(III)化合物在步骤 B)中与式(IV)丙二酸酯反应
其中 R1 代表 C1-C6-烷基、C2-C6-烯基、C2-C6-炔基、C3-C8-环烷基或苄基;在碱和镁化合物存在下反应,得到式(V)化合物
其中 X 和 R 定义如式(I);R1 定义如式(IV);并将式(V)化合物脱羧。可选择将得到的式 (I) 化合物进一步与式 (VIII) 的三唑衍生物反应
本发明进一步涉及式(V)化合物。