Dynamic Control of Chiral Space Through Local Symmetry Breaking in a Rotaxane Organocatalyst
作者:Marcel Dommaschk、Javier Echavarren、David A. Leigh、Vanesa Marcos、Thomas A. Singleton
DOI:10.1002/anie.201908330
日期:2019.10.14
We report on a switchable rotaxane molecular shuttle that features a pseudo-meso 2,5-disubstituted pyrrolidine catalytic unit on the axle whose localsymmetry is broken according to the position of a threaded benzylic amide macrocycle. The macrocycle can be selectively switched (with light in one direction; with catalytic acid in the other) with high fidelity between binding sites located to either
The Organocatalytic Enantioselective Michael Addition of Aldehydes to Vinyl Sulfones in Water
作者:Teck-Peng Loh、Jian Xiao、Yan-Ling Liu
DOI:10.1055/s-0030-1258483
日期:2010.8
The first organocatalytic enantioselective Michael addition of aldehydes to vinyl sulfones in water was achieved using our rationally designed organocatalyst. The rigid nature of the tricycle with an inherent chiral pocket provides a well-organized chiral environment, which together with the hydrophobic pocket, enabled this elusive reaction to proceed smoothly in water.