申请人:SHIONOGI & CO., LTD.
公开号:EP0375670A2
公开(公告)日:1990-06-27
A process for preparing a compound of the formula:
in which:
R is alkyl having a plurality of fluorines; R¹ is hydrogen, alkyl, halogen or optionally substituted phenyl; and R² is hydrogen or alkyl comprising either;
(a) reacting a compound of formula
in which R¹ is hydrogen, alkyl or optionally substituted phenyl, with hydroxylamine or a salt thereof or hydroxyurea; or
(b) reacting a compound of formula
wherein R¹ is as defined above, with hydroxylamine or a salt thereof or hydroxyurea; or
(c) reacting a compound of formula
wherein R is as defined above, with a compound of the formula RCO₂R³ (V), wherein R³ is alkyl; or
(d) halogenating a compound of the formula:
wherein R and R² are as defined above.
一种制备式化合物的工艺:
其中
R是具有多个氟的烷基;R¹是氢、烷基、卤素或任选取代的苯基;R²是氢或烷基,包括以下任一项
(a) 将式
其中 R¹ 是氢、烷基或任选取代的苯基,与羟胺或其盐或羟基脲反应;或
(b) 式中 R¹ 如上定义的化合物与羟胺或其盐或羟基脲反应
式中 R¹ 如上所定义的化合物与羟胺或其盐或羟基脲反应;或
(c) 式中 R¹如上定义的化合物与羟胺或其盐或羟基脲反应
其中 R 如上所定义,与式 RCO₂R³ (V) 的化合物反应,其中 R³ 为烷基;或
(d) 卤化式化合物:
其中 R 和 R² 如上定义。