A Diversity-Oriented Approach to Spiroindolines: Post-Ugi Gold-Catalyzed Diastereoselective Domino Cyclization
作者:Sachin G. Modha、Amit Kumar、Dipak D. Vachhani、Jeroen Jacobs、Sunil K. Sharma、Virinder S. Parmar、Luc Van Meervelt、Erik V. Van der Eycken
DOI:10.1002/anie.201205052
日期:2012.9.17
Caught “Spiro” handed: A diversity‐oriented approach comprised of an Ugi four‐component reaction and a diastereoselective gold(I)‐catalyzed dominocyclization for the generation of complex spiroindolines under mild conditions has been developed. Variously substituted spiroindolines were synthesized in good to excellent yields and with complete diastereoselectivity.
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.
Silver(I) Triflate‐Catalyzed Protocol for the Post‐Ugi Synthesis of Spiroindolines
作者:Manzoor Zaman、Muhammad Hasan、Anatoly A. Peshkov、Kristof Van Hecke、Erik V. Van der Eycken、Olga P. Pereshivko、Vsevolod A. Peshkov
DOI:10.1002/adsc.201901064
日期:2020.1.7
silver(I) triflate‐catalyzed protocol for the post‐Ugi synthesis of tetracyclic spiroindolines has been developed. The protocol worked best for indole‐3‐carbaldehyde‐derived Ugi adducts obtained using anilines and 3‐aryl propiolic acids. Thus, it is complementary to the previous cationic gold‐catalyzed procedure that was developed for analogues Ugi substrates derived from aliphatic amines and 3‐alkyl propiolic