The identification and development of a catalyst for the enantioselective nucleophilic addition of a trifluoromethyl anion to a ketone is described. An easily prepared cinchonine-derived catalyst was used in amounts as low as 4 mol% to afford enantiomeric excess as high as 92%.
In‐situ Utilization of Non‐Stabilized Diazoalkanes from (3+2) Cycloaddition of Linear <i>N</i>,<i>N</i>‐Disilyl Enamines and Azides
作者:Vinh Do Cao、Sinjae Lee、Seewon Joung
DOI:10.1002/adsc.202301213
日期:2024.1.9
A (3+2) cycloaddition reaction of linear N,N-disilyl enamines and organic azides is investigated. The N,N-disilyl enamines, derived from the selective double hydrosilylation of conjugated nitriles, are employed in-situ for this investigation. The resulting triazoline intermediate from the (3+2) cycloaddition reaction promptly undergoes retro-(3+2) cycloaddition to yield versatile non-stabilized diazoalkane