Remote Activation of the Nucleophilicity of Isatin
摘要:
The concept of the remote activation of reactivity was first applied in asymmetric organocatalysis. An isatin 3-phenylimine derivative acts as a donor in the thiourea catalyzed asymmetric addition to unsaturated 1,4-ketoesters, affording aza-Michael adducts in high enantiomeric purity and yield.
Hypersensitive Inhibition of Organocatalysts by Halide Salts: Are Two Catalysts Involved in the Mannich Reaction?
作者:Teppo O. Leino、Dimitris Noutsias、Kaisa Helttunen、Jani O. Moilanen、Eeki Tarkkonen、Elina Kalenius、Anniina Kiesilä、Petri M. Pihko
DOI:10.1002/ejoc.202400321
日期:2024.7.8
Canyou kill two catalysts with one chloride? Thiourea/urea catalysts are sensitive to inhibition by chloride salts, but here we find that they appear to be too sensitive. Are two catalysts inhibited by a single chloride ion, or are there two catalysts involved in the reaction? Our kinetic detective story suggests the latter!