-oxodithioacetals 2a-m are shown to undergo facile one pot thermal dehydration and dethioacetalization in the presence of dimethyl sulphoxide to afford the corresponding ene- and polyene aldehydes 5a-m and 6a-b in good yields. The probable mechanism of dethioacetalization with dimethyl sulphoxide has also been discussed.
通过将相应的-氧二
硫缩醛2a-m通过
硼氢化钠还原(或格氏添加)获得的无环和环状的-羟基二
硫缩醛3a-m和4a-b显示在
二甲亚砜存在下容易地一锅热脱
水和脱
硫缩醛化以得到相应的烯和多烯醛5a-m和6a-b的收率很高。还讨论了用
二甲基亚砜进行脱
硫缩醛化的可能机理。