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.
Keteniminium Salts as Key Intermediates for the Efficient Synthesis of 3‐Amino‐Indoles and ‐Benzofurans
作者:Dylan Dagoneau、Amandine Kolleth、Pierre Quinodoz、Gamze Tanriver、Saron Catak、Alexandre Lumbroso、Sarah Sulzer‐Mossé、Alain De Mesmaeker
DOI:10.1002/hlca.201900217
日期:2020.1
Herein, we describe a high yielding approach towards the synthesis of 3‐amino‐indoles and ‐benzofurans through 6π‐electrocyclization. This was made possible by taking advantage of the high reactivity of keteniminium salts, formed in‐situ by treating with triflic anhydride and 2‐fluoropyridine amides bearing at the α‐position either an aniline or a phenoxy moiety. These mild conditions, on top of furnishing