Selective functional group transformation using guanidine: the conversion of an ester group into an amide in vinylogous ester–aldehydes of imidazole
作者:Ravi K. Ujjinamatada、Ramachandra S. Hosmane
DOI:10.1016/j.tetlet.2005.07.024
日期:2005.9
An efficient and convenient method has been described for the selective conversion of an ester group into the corresponding carboxamide in vinylogous ester–aldehydes of imidazole. The method uses excess guanidine, which protects the aldehyde function as a diaminodihydro-s-triazine moiety. The carboxaldehyde group is regenerated by hydrolysis of the triazine moiety to provide vinylogous amide–aldehydes
已经描述了一种有效且方便的方法,用于在咪唑的乙烯基酯-醛中将酯基选择性转化为相应的羧酰胺。该方法使用过量的胍,它可以保护的醛用作diaminodihydro-小号嗪部分。羧醛基通过三嗪部分的水解而再生,以提供咪唑的乙烯基酰胺醛作为最终产物。