4S,5R,6S,8R,9R) diastereomer. Compound 5 was transformed to optically active pseudo-β-L-allopyranose effectively via (1R)-1-[(1S,2S,3S,4R,5S)-3,4,5-tris(benzyloxy)-2-hydroxycyclohexyl]-1,2-ethanediol (9). Cyclohexanecarbaldehyde formed by glycol cleavage of 9 was treated with methanesulfonyl chloride and reduced with lithium aluminium hydride to give (3S,4R,5S)-3,4,5-tris(benzyloxy)-1-cyclohexene-1-methanol
D-葡萄糖衍生的手性合成子 (1R,6R,8R,9R)-8,9-isopropylidenedioxy-7-oxabicyclo[4.3.0]non-4-en-3-one (1) 的
二异丁基氢化铝还原,得到(1R,3S,6R,8R,9R)- 和 (1R,3R,6R,8R,9R)-8,9-isopropylidenedioxy-7-oxabicyclo[4.3.0]non-4-en 的 7:1 混合物-3-醇、(2)和(2')。通过
四氧化锇氧化将顺式二醇引入 2 和 2' 的 3-O-乙酰基衍
生物的双键,提供了 (1R,3S,4R,5S,6S,8R,9R)-3-乙酰氧基的非对映异构混合物- 8,9-isopropylidenedioxy-7-oxabicyclo[4.3.0]nonane-4,5-diol (5) 和 (1R,3R,4S,5R,6S,8R,9R) 非对映异构体。化合物 5 通过