Studies related to dihydro-1,4-thiazines. Part VIII. β-Elimination reactions of 7-oxo-8-oxa-4-thia-1-azabicyclo[4.3.0]non-2-ene-3-carboxylates
作者:Anthony G. W. Baxter、Richard J. Stoodley
DOI:10.1039/p19760000584
日期:——
The (6R)-9,9-dimethyl derivative of methyl 7-oxo-8-oxa-4-thia-1-azabicyclo[4.3.0]non-2-ene-3-carboxylate (1) is converted into potassium α-(5-methoxycarbonyl-2,2-dimethyl-Δ4-thiazolin-3-yl)acrylate (11) by potassium t-butoxide. When the reaction is conducted in the presence of iodomethane, methyl (Z)-β-(2,2-dimethyl-4-methylene-5-oxo-oxazolidin-3-yl)-α-methylthioacrylate (20) is formed, suggesting
7-氧代-8-氧杂-4-硫杂-1-氮杂双环[4.3.0]非-2-烯-3-羧酸甲酯的(6 R)-9,9-二甲基衍生物(1)转化为钾α-(5-甲氧基羰基-2,2-二甲基- Δ 4 -thiazolin -3-基)丙烯酸乙酯(11)叔丁醇钾。当反应在碘甲烷的存在下进行时,形成甲基(Z)-β-(2,2-二甲基-4-亚甲基-5-氧代-恶唑烷-3-基)-α-甲基硫代丙烯酸酯(20),表明该重排是由β-消除过程触发的。