Supported gold nanoparticles as efficient and reusable heterogeneous catalyst for cycloisomerization reactions
作者:Felix Schröder、Manuel Ojeda、Nico Erdmann、Jeroen Jacobs、Rafael Luque、Timothy Noël、Luc Van Meervelt、Johan Van der Eycken、Erik V. Van der Eycken
DOI:10.1039/c5gc00430f
日期:——
We have developed an attractive and green approach for the synthesis of spiroindolines under heterogeneous conditions using supported gold nanoparticles in combination with microwave irradiation.
Leaching-Free Supported Gold Nanoparticles Catalyzing Cycloisomerizations under Microflow Conditions
作者:Felix Schröder、Nico Erdmann、Timothy Noël、Rafael Luque、Erik V. Van der Eycken
DOI:10.1002/adsc.201500628
日期:2015.10.12
A continuous-flow protocol for the gold-catalyzed cycloisomerization of sterically hindered Ugi-adducts to spiroindolines in a packed-bed reactor is presented. Spiroindolines with various substitution patterns are formed in good yields and with good selectivity. A detailed characterization of the catalyst deactivation process was conducted, whereas no metal leaching from the catalyst was detected.