申请人:Lonza AG
公开号:US06127548A1
公开(公告)日:2000-10-03
A process for the preparation of formylimidazoles of the general formula: or its tautomers, in which R.sup.1 is hydrogen or alkyl, and R.sup.2 is hydrogen, halogen or alkyl. In a first stage, an imidazole derivative of the general formula: ##STR1## or its tautomers, in which R.sup.1 and R.sup.2 are as defined above, is converted, by introducing an amino protective group, into an imidazole derivative of the general formula: ##STR2## or its tautomers, in which R.sup.3 is an amino protective group. Such derivative is formylated in a second stage in the presence of an organometallic compound and a suitable electrophile to give an imidazole derivative of the general formula: ##STR3## or its tautomers, in which R.sup.1, R.sup.2 and R.sup.3 are as defined above. Then, in a third stage, the end product of the formula I is obtained by cleaving off the amino protective group.
一种制备通式为的甲酰咪唑的方法:或其互变异构体,其中R.sup.1为氢或烷基,R.sup.2为氢、卤素或烷基。在第一阶段,将通式为的咪唑衍生物:##STR1##或其互变异构体,其中R.sup.1和R.sup.2如上定义,通过引入氨基保护基转化为通式为的咪唑衍生物:##STR2##或其互变异构体,其中R.sup.3为氨基保护基。在第二阶段中,在有机金属化合物和适当的亲电试剂存在下,对该衍生物进行甲酰化,得到通式为的咪唑衍生物:##STR3##或其互变异构体,其中R.sup.1、R.sup.2和R.sup.3如上定义。然后,在第三阶段,通过去除氨基保护基获得通式I的终产物。