The tin(II) enolate is generated from 3-acylthiazolidine-2-thione with β-alkoxy or β-amino functionality on treatment with stannous triflate in the presence of N-ethylpiperidine. The enolate further reacts with aldehyde to afford the aldol product with high syn-stereoselectivity. The aldol product thus produced is stereospecifically converted to β-lactam derivative with hydroxyethyl side chain.
在
N-乙基哌啶存在下,用三酸
锡处理具有 β-烷氧基或 β-
氨基官能团的 3-酰基
噻唑烷-2-
硫酮时,会生成
锡(II)烯醇。烯醇盐进一步与醛发生反应,以高合成-立体选择性得到醛醇产物。由此生成的醛醇产物可立体定向转化为带有羟乙基侧链的β-内酰胺衍
生物。