Both enantiomers of the gamma-chiral alpha,beta-dimethylated butyrolactones nat-1 and nat-2 from the moss Plagiomnium undulatum were synthesized stereoselectively through butenolides and tetronic acids, respectively. The configuration of the natural products was determined by GLC comparisons with mono(3-O-acetyl-6-O-tert-butyldimethylsilyl-2-O-methyl)hexakis(6-O-tert-butyldime thylsilyl-2,3-di-O-m
分别通过
丁烯内酯和tetronic酸选择性地合成了来自苔藓Plgiomnium undulatum的γ-手性α,β-二甲基化丁内酯nat-1和nat-2的两种对映体。
天然产物的构型通过与单(3-O-乙酰基-6-O-叔丁基二甲基甲
硅烷基-2-O-甲基)六(6-O-叔丁基二苯甲基丁基甲
硅烷基-2,3-di)的GLC比较确定-O-甲基)-β-
环糊精为固定相。