Abstract Both enantiomers of the γ-chiral α, β-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-butyldimethylsilyl-2, 3-di-O-methyl)-β-cyclodextrin as a stationary ...
