Resolution of Diols via Catalytic Asymmetric Acetalization
作者:Ji Hye Kim、Ilija Čorić、Chiara Palumbo、Benjamin List
DOI:10.1021/ja512481d
日期:2015.2.11
A highly enantioselective kinetic resolution of diols via asymmetricacetalization has been achieved using a chiral confined imidodiphosphoric acid catalyst. The reaction is highly efficient for the resolution of tertiary alcohols, giving selectivity factors of up to >300. Remarkably, even in cases where the selectivity factors are only moderate, highly enantioenriched diols are obtained via a stereodivergent
A Highly Regioselective Palladium-Catalyzed O,S Rearrangement of Cyclic Thiocarbonates
作者:William Mahy、Sinéad Cabezas-Hayes、Gabriele Kociok-Köhn、Christopher G. Frost
DOI:10.1002/ejoc.201701181
日期:2017.11.24
This work describes an operationally simple catalytic synthesis of cyclic S-thiocarbonates with predictable regioselectivity in good yields. The reaction utilizes substrates derived from ubiquitous 1,2-diols in an atom economical intramolecular rearrangement, catalysed by an inexpensive and simple catalyst–ligand system. A crystal structure is presented that clearly confirms the regioselectivity of