Improved stereoselective synthesis of both methyl α- and β-glycosides corresponding to the amino sugar component of the E Ring of calicheamicin γ1I and esperamicin A1
作者:Fabrizio Badalassi、Paolo Crotti、Lucilla Favero、Franco Macchia、Mauro Pineschi
DOI:10.1016/s0040-4020(97)00921-6
日期:1997.10
monosaccharide component (α and β-anomer) of the E Ring of calicheamicin γ1I and esperamicin A1 has been synthetized by an efficient and improved stereoselective procedure starting from methyl 2-deoxy-α- and β-D-ribopyranoside. The synthetic procedure makes use, in each case, of a cyclic sulphate and of the regioselective ring opening of an intermediate activated aziridine.
的E环的单糖组分(α和β端基异构体)刺孢霉素γ 1我和埃斯波霉素阿1已经通过从甲基2-脱氧- α-和β-d-ribopyranoside开始的有效和改进的立体选择性方法合成。在每种情况下,合成方法都使用环状硫酸盐和中间体活化的氮丙啶的区域选择性开环。