electron-withdrawing functionality has been implemented. The catalytic manifold operates under the reactivity generation principle "a good nucleophile generates a strong base", and it uses 1,4-diazabicyclo[2.2.2]octane (DABCO) as the catalyst, activated terminal alkynes as substrates and acetone cyanohydrin as the cyanide source. The acrylonitriles obtained as E,Z mixtures are straightforwardly resolved by simple flash
Synthesis of Chiral Nine‐Membered N‐Heterocycles through Silver(I)‐Promoted Cycloaddition and Rearrangement from
<i>N</i>
‐Vinyl‐α,β‐Unsaturated Nitrones with Chiral 3‐Propioloyloxazolidin‐2‐Ones
作者:Xiao‐Ting Qin、Ning Zou、Xiao‐Ling Cheng、Cui Liang、Dong‐Liang Mo
DOI:10.1002/adsc.202101199
日期:2022.2
A variety of chiral nine-membered N-heterocycles were prepared in moderate to good yields with high diastereoselectivity through a silver(I)-catalyzed [3+2] cycloaddition and [3,3]-rearrangement of N-vinyl-α, β-unsaturated nitrones and chiral 3-propioloyloxazolidin-2-ones. Experimental studies showed that silvercatalyst promoted the cycloaddition and rearrangement process, and the stereochemistry