treatment of cis-3,4-epoxy-7-(p-toluenesulfonamido)-1-heptyne with dicobalt octacarbonyl, Lewis acid, and cerium(IV) ammonium nitrate effected stereoselective formation of the trans-2-ethynyl-3-hydroxypiperidine skeleton with retention of configuration at the propynyl center. The piperidine derivative thus prepared was converted into the title compound efficiently.
描述了新的(+/-)-swainsonine的立体选择性全合成。顺式二羰八羰基,
路易斯酸和
硝酸铈(IV)
铵连续处理顺式3,4-环氧-7-(对
甲苯磺酰胺基)-
1-庚炔可立体选择性地形成反式-2-
乙炔基-
3-羟基哌啶骨架,在
丙炔中心保留构型。如此制备的
哌啶衍
生物有效地转化为标题化合物。