Trithioorthoester Exchange and Metathesis: New Tools for Dynamic Covalent Chemistry
作者:Michael Bothe、A. Gastón Orrillo、Ricardo L. E. Furlan、Max von Delius
DOI:10.1055/s-0039-1690992
日期:2019.10
acid-catalyzed exchangereaction of trithioorthoesters with thiols. We found that trithioorthoester exchange occurs readily in various solvents in the presence of stoichiometric amounts of strong Bronsted acids or catalytic amounts of certain Lewis acids. The scope of the exchangereaction was explored with various substrates, and conditions were identified that permit clean metathesis reactions between two
Reaction of trithiocarbonates with meta-chloroperoxybenzoic acid in CH2Cl2 at 0°C affords the corresponding S-oxides. These sulfines are relatively stable compounds which can be purified by chromatography. They react readily with organolithiums in THF at −78°C in a thiophilic manner to give carbanions which are stabilized by three sulfur groups. Hydrolysis affords trithioorthoester oxides. The thermal