Facile one pot thermal dehydration and dethioacetalization of β-hydroxydithioacetals with dimethyl sulphoxide : synthesis of α,β-unsaturated aldehydes
作者:Ch.Srinivasa Rao、M. Chandrasekharam、Balaram Patro、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1016/s0040-4020(01)85646-5
日期:1994.1
-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。