Polysiloxane-bound ligand accelerated catalysis: a modular approach to heterogeneous and homogeneous macromolecular asymmetric dihydroxylation ligands
作者:Michael S. DeClue、Jay S. Siegel
DOI:10.1039/b406341d
日期:——
polysiloxane backbone while approximately half of these sites contained ligand in the homogeneous version. This approach led to macromolecular catalysts with high loadings of ligand and therefore materials with very low equivalent weights. Although these polymers are highly loaded they do maintain reactivity on a par with their free ligand counterpart. Using straightforward purification techniques (i.e. precipitation
Asymmetric Brominative Dearomatization of 2-Naphthols Using a Cinchona Alkaloid-Based Organocatalyst
作者:Kouhei Omae、Yoshihiro Miyake、Mio Shimogaki
DOI:10.1021/acs.joc.3c02945
日期:2024.3.15
A cinchonaalkaloid-basedorganocatalyst enables asymmetricbrominativedearomatization of 2-naphthols, providing the corresponding bromonaphthalenones with high enantioselectivities. The first metal-free reaction can accommodate a variety of functional groups and give useful frameworks bearing a Br-containing tetrasubstituted stereogenic center.