A series of functionalized 2,5-dihydrofurans were efficiently synthesized via an amine-promoted Petasis borono–Mannich reaction of 4-substituted 1,2-oxaborol-2(5H)-ols with salicylaldehydes in high yields. The process, which combines a boronic acid-based Mannich reaction and a highly efficient intramolecular SN2 cyclization, provides a one-step and efficient route toward 2,5-dihydrofurans from simple
通过胺促进的4-取代的1,2-氧杂
硼-2(5 H)-醇与
水杨醛的胺促进的Petasis borono-Mannich反应,可以高效合成一系列功能化的
2,5-二氢呋喃。该方法结合了基于
硼酸的曼尼希反应和高效的分子内S N 2环化,为从简单稳定的原料制备
2,5-二氢呋喃提供了一步有效的途径。