作者:Tanaka, Nao、Mitton-Fry, Sophia R.、Hwang, Meemie U.、Zhu, Joshua L.、Scheidt, Karl A.
DOI:10.1021/acscatal.4c01595
日期:——
Saturated oxygen-containing heterocycles are present in numerous natural products and biologically active compounds. While the oxa-Pictet–Spengler reaction conventionally serves as a traditional synthetic strategy for preparing arene-fused tetrahydropyrans (THPs), existing methods typically involve harsh conditions. Disclosed herein is the development of a mild photocatalytically triggered oxa-Pictet–Spengler
饱和含氧杂环存在于许多天然产物和生物活性化合物中。虽然氧杂-皮克泰-斯宾格勒反应通常是制备芳烃稠合四氢吡喃(THP)的传统合成策略,但现有方法通常涉及苛刻的条件。本文公开了温和光催化引发的醚 oxa-Pictet-Spengler 反应的开发,提供了稠合 THP 化合物的合成方法。调谐的双光/氢原子转移 (HAT) 催化能够在苄基醚上进行位点和化学选择性 C-H 官能化,从而形成苯甲酸酯缩醛中间体。然后将关键中间体暴露于随后的路易斯酸催化,从而促进氧碳鎓离子的生成和闭环。值得注意的是,这种组合策略成功解决了与光催化系统固有的过度氧化相关的问题。