Preparation of aromatic and heteroaromatic carboxylic acids by catalytic ozonolysis
申请人:——
公开号:US20030216577A1
公开(公告)日:2003-11-20
A process for catalytically oxidizing alkylaromatic compounds of the formula (I)
Ar—CH
2
—R
where Ar is an optionally substituted, aromatic or heteroaromatic 5-membered or 6-membered ring or a ring system having up to 20 carbon atoms where Ar may optionally be fused to a C
1
-C
6
-alkyl group in which up to 2 carbon atoms may be replaced by a heteroatom, and R is hydrogen, phenyl, benzyl or heteroaryl, where the phenyl, benzyl or heteroaryl radicals may also be joined to Ar by a bridge, or R together with Ar forms an optionally substituted ring system which may contain one or more optionally substituted heteroatoms, to the corresponding aromatic or heteroaromatic carboxylic acids in a solvent with ozone in the presence of a transition metal catalyst and optionally in the presence of an acid at a temperature between −70° C. and 110° C. to the corresponding carboxylic acid.
将式(I)中的烷基芳香化合物催化氧化为相应的芳香或杂芳羧酸的过程是在溶剂中,在存在过渡金属催化剂和可选地存在酸的情况下,利用臭氧将式(I)中的化合物氧化为相应的芳香或杂芳羧酸的过程。其中,式(I)中Ar为可选地取代的芳香或杂芳5-或6-成员环或具有多达20个碳原子的环系统,其中Ar可选地与一个C1-C6-烷基基团融合,其中最多有2个碳原子可被杂原子取代;R为氢、苯基、苄基或杂芳基,其中苯基、苄基或杂芳基基团也可以通过桥连接到Ar,或R与Ar一起形成一个可选地取代的环系统,该环系统可以含有一个或多个可选地取代的杂原子,反应温度在-70°C至110°C之间。