Utilization of Natural Sunlight and Air in the Aerobic Oxidation of Benzyl Halides
摘要:
A novel, efficient oxidation of alpha-aryl halogen derivatives to the corresponding alpha-aryl carbonyl compounds at room temperature has been disclosed. Natural sunlight and air are successfully utilized in this approach through the combination of photocatalysis and organocatalysis. A plausible mechanism was proposed on the basis of the mechanistic studies.
Unified Synthesis of Azepines by Visible-Light-Mediated Dearomative Ring Expansion of Aromatic <i>N</i>-Ylides
作者:Matthew J. Mailloux、Gabrielle S. Fleming、Shruti S. Kumta、Aaron B. Beeler
DOI:10.1021/acs.orglett.0c04050
日期:2021.1.15
unified approach to azepines by dearomative photochemical rearrangement of aromatic N-ylides. Deprotonation of quaternary aromatic salts with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or N,N,N′,N’-tetramethylquanidine (TMG) under visible light irradiation provides mono- and polycyclic azepines in yields up to 98%. This ring-expansion presents a new mode of access to functionalized azepines from N-heteroarenes
Highly Enantioselective Hydrogenation of Amides via Dynamic Kinetic Resolution Under Low Pressure and Room Temperature
作者:Loorthuraja Rasu、Jeremy M. John、Elanna Stephenson、Riley Endean、Suneth Kalapugama、Roxanne Clément、Steven H. Bergens
DOI:10.1021/jacs.6b12254
日期:2017.3.1
High-throughput screening and lab-scale optimization were combined to develop the catalytic system trans-RuCl2((S,S)-skewphos)((R,R)-dpen), 2-PrONa, and 2-PrOH. This system hydrogenates functionalized α-phenoxy and related amides at room temperature under 4 atm H2 pressure to give chiralalcohols with up to 99% yield and in greater than 99% enantiomericexcess via dynamic kinetic resolution.