Heterocyclisation of tert-butyldimethylsilyl (TBS) protected γ-hydroxy-α,β-unsaturated ketones catalysed by para-toluenesulfonic acid (p-TSA) to form substituted furans is reported. The reaction proceeds under mild conditions at room temperature in methanol to give a range of furan products (21 examples, up to 98% yield). Mechanistic experiments suggest the reaction proceeds via in situ deprotection
报道了由
对甲苯磺酸 ( p -
TSA) 催化的叔丁基二甲基甲
硅烷基 (TBS) 保护的 γ-羟基-α,β-不饱和酮杂环化形成取代
呋喃。反应在温和的条件下在室温下在
甲醇中进行,得到一系列
呋喃产物(21 个实例,高达 98% 的收率)。机理实验表明,反应通过原位脱保护进行,然后进行催化脱
水杂环化。