Scandium(III) Zeolites as New Heterogeneous Catalysts: [4+2]Cyclocondensation of in situ Generated Aryl Imines with Alkenes
作者:Andrea Olmos、Jean Sommer、Patrick Pale
DOI:10.1002/chem.201002649
日期:2011.2.7
Scandium(III)‐exchanged zeolite was used as heterogeneous ligand‐free catalysts for the [4+2]cyclocondensation of amines and aldehydes with alkenes through the in situ formation of imines. Such catalysts offered a versatile, efficient, and highly regio‐ and stereoselective synthesis of tetrahydroquinoline derivatives. These catalysts exhibited a wide scope and compatibility with functional groups.
Reexamining Povarov Reaction’s Scope and Limitation in the Generation of HCV-NS4A Peptidomimetics
作者:Maan T. Khayat、Abdelsattar M. Omar、Mahmoud A. Elfaky、Yosra A. Muhammad、Elaf A. Felemban、Khalid M. El-Say、Moustafa E. El-Araby
DOI:10.1155/2022/8181543
日期:2022.2.10
mimics that cover the region between residues Ile-25′ to Arg-28′. The synthetic plan featured the Povarov reaction as an efficient strategy to construct the 1,7-naphthyridine core. Although this reaction has been reported in many literatures, critical assessments for its scope and limitations are scarce. In our work, we found that Povarov was extremely sensitive to alkene and aldehyde reactants. Moreover