Asymmetric Michael reactions of thiols with enones were catalyzed by a Sc(OTf)3–chiral bipyridine complex at room temperature in water without using any organic solvents, to afford the desired sulfides in high yields with high enantioselectivities.
Asymmetric Michael reactions and enantioselective protonations between enones and thiols were catalyzed by a Sc(OTf)3–chiral 2,2′-bipyridine complex in water. The remarkable governing of the enantioselectivity for simple introduction of protons despite their abnormally high mobility in water may provide us with new synthetic opportunities as well as significant chemical advances.
We report the first asymmetric sulfa-Michael addition (SMA) reactions using chiral N-heterocycliccarbene (NHC) as a non-covalent organocatalyst. We demonstrate that a triazolium salt derived NHC functions as an excellent...
Efficient recycling of catalyst-solvent couples was showcased in enantioselective Lewis acid-catalyzedreactions that were run in highly Lewis basic environments in which there is a greater risk of metal leaching. The success is attributed to a bioinspired approach to heterogenize microhydrated chiral Lewis acids within appropriate hydrophobic cavities, thereby decreasing catalyst deactivation and