Small Ring Constrained Peptidomimetics. Synthesis of Epoxy Peptidomimetics, Inhibitors of Cysteine Proteases
作者:Mariangela Demarcus、Maria Luisa Ganadu、Giovanni Maria Mura、Andrea Porcheddu、Laura Quaranta、Gianna Reginato、Maurizio Taddei
DOI:10.1021/jo000961w
日期:2001.2.1
Different dipeptide analogues containing an oxirane ring in the place of the peptidic bond were prepared starting from naturally occurring amino acids. N-Fmoc-amino aldehydes were transformed into the corresponding methoxyvinyl derivatives through a Wittig reaction, and the addition of PhSeCl gave a series of different alpha-phenylselenyl aldehydes. Mukajiama reaction with silylketene acetals gave
从天然存在的氨基酸开始,制备了不同的在肽键上含有环氧乙烷环的二肽类似物。通过Wittig反应将N-Fmoc-氨基醛转化为相应的甲氧基乙烯基衍生物,并加入PhSeCl得到一系列不同的α-苯基硒基醛。Mukajiama与甲硅烷基乙烯酮缩醛的反应产生了一种中间产物,该中间产物最终被转化为所需的环氧乙烷基肽模拟物。按照这种策略,我们能够从对映体纯的氨基酸开始控制三个新的连续立体中心。由于最终环氧化物在酸性条件下相对不稳定,因此二肽类似物可用于SASRIN树脂的SPPS中。此外,单二肽模拟物的合成是在固相上进行的,以生成一个小的环氧肽模拟物库。这项工作中制备的某些产品是半胱氨酸蛋白酶的时间依赖性可逆抑制剂。