Total Synthesis of L-Oleandrose and L-Cymarose from an Achiral Precursor, Methyl Sorbata

2,6-Dideoxy sugars L-oleandrose 1 and L-cymarose 2, the key carbohydrate of antibiotics and cardiac glycosides, were synthesized by an efficient synthetic method from an achiral precursor, methyl sorbate.

Asymmetric Syntheses of Osmundalactones and 5-Hydroxy-2-hexen-4-olides from 4-Benzyloxy-5-hydroxy-2(E)-hexenoate

（＋）-（4S,5R）-and （-）-（4R,5S）-osmundalactones as well as （＋）-（4R,5S）- and （-）-（4S,5R）- 5-hydroxy-2-hexen-4-olides were synthesized by a concise and efficient synthesis method starting from 4-benzyloxy-5-hydroxy-2（E）-hexenoate in good yield with over 99% e.e..