Facile synthesis and cleavage of imidazolidines in a novel protection strategy for the preparation of peptides containing a reduced amide bioisostere
作者:Jun Zhao、Vatee Pattaropong、Yongying Jiang、Longqin Hu
DOI:10.1016/s0040-4039(02)02562-5
日期:2003.1
treating monoalkoxycarbonyl vicinal diamines at room temperature with aqueous 37% formaldehyde in the presence of Montmorillonite KSF as a solid catalyst. The imidazolidines were shown to be useful intermediates in a novel protection strategy for the synthesis of peptide analogues containing a reduced glycine amide bioisostere. The imidazolidine intermediate was cleaved conveniently and efficiently by 50%
在蒙脱土KSF作为固体催化剂存在下,在室温下用37%甲醛水溶液处理单烷氧基羰基邻二胺,可获得不对称咪唑烷类化合物,产率为75-91%。咪唑烷类被证明是用于合成新的保护策略的有用中间体,该策略用于合成含有还原的甘氨酸酰胺生物等排体的肽类似物。咪唑烷中间体被50%TFA的二氯甲烷溶液方便有效地裂解。