An intriguing, facile, and efficient oxidation and cyclization of alkynes catalyzed by Pd(OAc)2 in a fluorous biphasic system of N,N-dimethylacetamide (DMA) and perfluorodecalin directly with molecular oxygen is described, which opens an efficient access to tetrasubstituted furans. Under the optimized conditions, intermolecular reaction between diverse alkynes provides the corresponding mixture of regioisomers with appreciable selectivity. Intramolecular oxidation and cyclization of alkynes are also successfully demonstrated. The reaction proceeds efficiently under mild conditions with atmospheric oxygen as the sole oxidant.
本文报道了一种由Pd(OAc)2在N,N-二甲基乙酰胺(
DMA)和
全氟十烷的
氟烥双相体系中直接催化
炔烃的氧化环化反应,该反应利用分子氧作为氧化剂,为四取代
呋喃的高效合成开辟了新途径。在优化的条件下,不同
炔烃之间的分子间反应提供了相应的位置异构体混合物,并具有良好的选择性。
炔烃的分子内氧化环化反应也成功实现。该反应在温和条件下高效进行,仅使用大气氧作为唯一的氧化剂。