申请人:ZHEJIANG ZHUJI UNITED CHEMICALS CO., LTD
公开号:US20170369412A1
公开(公告)日:2017-12-28
A preparative method for carboxylic acids is disclosed in the present invention. The method is characterized in that: compounds (II) are reacted in the presence of hydrogen peroxide and base to produce target products (I), as represented by the following reaction scheme: wherein R
1
is aryl, pyridyl, pyrimidyl, pyridazinyl, pyrazinyl, benzothienyl, benzofuranyl, quinolinyl, isoquinolinyl, thiadiazolyl, C
1-6
alkyl, C
3-6
cycloalkyl, C
2-6
alkenyl, C
2-6
alkynyl and hydrogen; R
2
is alkoxycarbonyl, alkylaminocarbonyl, aminocarbonyl, alkylthiolcarbonyl, cyano, sulfonyl, sulfinyl, carbonyl, aldehyde, carboxyl, nitro, alkyl and hydrogen; R
3
is alkoxycarbonyl, alkyl amido carbonyl, aminocarbonyl, cyano, sulfonyl, sulfinyl, carbonyl, carboxyl and nitro. The present invention has the following main benefits: cheap and readily available starting materials, safe processes, high yield, good quality, which facilitates industrial production.
本发明公开了一种
羧酸的制备方法。该方法的特点在于:在
过氧化氢和碱的存在下,化合物(II)发生反应,生成目标产物(I),如下面的反应方案所示:其中R1为芳基、
吡啶基、
嘧啶基、
吡啶并
嘧啶基、
吡嗪基、
苯并噻吩基、
苯并呋喃基、
喹啉基、
异喹啉基、
噻二唑基、C1-6烷基、C3-6
环烷基、C2-6
烯基、C2-6炔基和
氢;R2为烷
氧羰基、烷基
氨基羰基、
氨基羰基、烷基
硫醇羰基、
氰基、磺酰基、
亚砜基、羰基、醛基、羧基、硝基、烷基和
氢;R3为烷
氧羰基、烷基
酰胺羰基、
氨基羰基、
氰基、磺酰基、
亚砜基、羰基、羧基和硝基。本发明具有以下主要优点:起始原料廉价且易得,工艺安全,产率高,质量好,有利于工业生产。