An efficient stereoselective synthesis of the amino sugar component (E ring) of calicheamicin γ1I
作者:Paolo Crotti、Valeria Di Bussolo、Lucilla Favero、Franco Macchia、Mauro Pineschi
DOI:10.1016/0957-4166(96)00074-2
日期:1996.3
A simple, efficient, stereoselective synthesis of the methyl 2,4-dideoxy-4-(ethylamino)-3-O-methyl-β-L-threo-pentopyranoside2, corresponding to the E monosac-charide unit (E ring) of calicheamicin 1, is described. The synthetic procedure utilizes the methyl 2-deoxy-β-D-ribopyranoside 3 as the enantiopure starting material and the acid methanolysis of the intermediate activated aziridine 12 to give
一种简单,高效,立体选择性的甲基2,4-二脱氧-4-(乙基氨基)-3 - O-甲基-β-L-苏-戊吡喃糖苷2的合成,对应于E的单糖单元(E环)描述了加利车霉素1。合成程序利用甲基2-脱氧-β-D-核糖吡喃糖苷3作为对映体纯原料,并通过中间体活化的氮丙啶12的酸甲醇分解,分6步得到所需的氨基糖2,令人满意的高总收率(60% )。在合成过程的任何时候都不需要分离阶段。