Enantiopure purpurosamine C type glycosyl donors an improved access from rac-acrolein dimer — biocatalytic resolution
作者:Silke Erbeck、Horst Prinzbach
DOI:10.1016/s0040-4039(97)00448-6
日期:1997.4
An improved synthetic access to a suitably “protected” purpurosamine C type glycosyl donor (11, analogously ent-11) starting from racemic 3,4-dihydro-2H-pyran-2-carbaldehyde (rac-1, acrolein dimer) implies an “indirect aziridination protocol” and a biocatalytic resolution step (acetate hydrolysis, ee > 98). The latter's stereochemical course is confirmed by a highly α-selective glycosylation with an
到适当的“保护” purpurosamine C类糖基供体的改进的合成途径(11,类似地ENT - 11)由外消旋-3,4-二氢2开始ħ吡喃-2-甲醛(外消旋- 1,丙烯醛二聚体)意味着一个“间接叠氮化方案”和生物催化拆分步骤(乙酸酯水解,ee> 98)。后者的立体化学过程通过具有已知绝对构型的受体的高度α-选择性糖基化来证实。