申请人:Welzig Stefan
公开号:US20090203920A1
公开(公告)日:2009-08-13
The invention relates to a method for isolating 5-substituted tetrazoles of general formula (I)
in which R represents a substituted biphenyl radical during which the ring closure, starting from a corresponding nitrile, is carried out in organic solvents while using alkali, alkaline-earth or organotin azides. The organic phases containing the nitrile and the tetrazol are firstly mixed with water while firstly forming three liquid phases, after which the aqueous phase containing the azide and the phase containing the nitrile are separated out, and the middle organic phase containing the tetrazol is subsequently processed. In the case of ester groups to be saponified, this phase is mixed with alkali lye, after which the organic phase is separated out and the aqueous phase is acidified or otherwise, this phase is immediately acidified and purified.
该发明涉及一种用于分离5-取代四唑的方法,其通式为(I),其中R代表取代联苯基团,其过程中,从相应的腈开始进行环闭合,在有机溶剂中使用碱、碱土或有机锡叠氮化合物。首先将含有腈和四唑的有机相与水混合,首先形成三个液相,然后将含有叠氮化合物的水相和含有腈的相分离出来,随后处理含有四唑的中间有机相。对于要皂化的酯基团,将此相与碱液混合,然后分离出有机相,将水相酸化,或者立即酸化和纯化此相。