Light‐Driven Enantioselective Synthesis of Pyrroline Derivatives by a Radical/Polar Cascade Reaction
作者:Ricardo I. Rodríguez、Leonardo Mollari、José Alemán
DOI:10.1002/anie.202013020
日期:2021.2.23
functionalization of acyl heterocycles through a hydrogen‐atom transfer (HAT) process and the use of tailor‐made ketimines as reliable electrophilic partners. This transformation is translated into an enantiomerically controlled radical/polar cascade reaction in which water is produced as the sole by‐product and stereoselectivity is dictated by coordination to a chiral‐at‐rhodium catalyst.
phase‐transfer catalyst (PTC) can mediate the highlyenantioselectivetrifluoromethylthiolation of β‐ketoesters with the previously developed SCF3 reagent (see scheme). Reactions of indanone‐derived β‐ketoesters occurred with high yield and excellent enantioselectivity with quinine as catalyst. Reactions of tetralone‐ or 1‐benzosuberone‐derived β‐ketoesters occurred with moderate to good enantioselectivity with
Copper-Boxmi Complexes as Highly Enantioselective Catalysts for Electrophilic Trifluoromethylthiolations
作者:Qing-Hai Deng、Christoph Rettenmeier、Hubert Wadepohl、Lutz H. Gade
DOI:10.1002/chem.201303641
日期:2014.1.3
The enantioselectivetrifluoromethylthiolation of β‐ketoesters using chiral copper–boxmicomplexes as catalysts is reported. A number of α‐SCF3‐substituted β‐ketoesters have been obtained with up to >99 % enantiomeric excess (ee), and the trifluoromethylthiolated products were then transformed diastereoselectively to α‐SCF3‐β‐hydroxyesters with two adjacent quaternary stereocenters.