Cycloisomerization of Conjugated Allenones into Furans under Mild Conditions Catalyzed by Ligandless Au Nanoparticles
作者:Leandros Zorba、Marios Kidonakis、Iakovos Saridakis、Manolis Stratakis
DOI:10.1021/acs.orglett.9b01869
日期:2019.7.19
Au nanoparticles supported on TiO2 (1 mol %) catalyze the quantitative cycloisomerization of conjugated allenones into furans under very mild conditions. The reaction rate is accelerated by adding acetic acid (1 equiv), but the acid does not participate in the protodeauration step as in the corresponding Au(III)-catalyzed transformation. The process is purely heterogeneous, allowing thus the recycling
负载在TiO 2(1 mol%)上的Au纳米颗粒在非常温和的条件下催化共轭异戊烯向呋喃的定量环异构化。通过加入乙酸(1当量)可加快反应速度,但该酸不像相应的Au(III)催化的转化反应那样参与原脱氧步骤。该方法是纯均相的,因此允许在几次运行中有效地回收和再利用催化剂。