Visible-light-induced N-heterocyclic carbene mediated cascade transformation of N-alkenoxypyridinium salts
作者:He Sheng、Qiang Liu、Fei Chen、Zhixiang Wang、Xiangyu Chen
DOI:10.1016/j.cclet.2022.01.028
日期:2022.9
N-alkenoxypyridinium salts are widely used for the synthesis of α-functionalized ketones via umpolung strategy, such approaches are usually limited to special nucleophiles at high temperatures. Herein, we developed an alternative photoinduced N-heterocyclic carbene (NHC)- mediated functionalization of N-alkenoxypyridinium salts with various nucleophiles, including tetramethylammonium azide, secondary amines, aryl
虽然N-烯氧基吡啶鎓盐广泛用于通过umpolung 策略合成α-官能化酮,但这种方法通常仅限于高温下的特殊亲核试剂。在此,我们开发了一种替代的光诱导N-杂环卡宾 (NHC)-介导的N-烯氧基吡啶鎓盐与各种亲核试剂的功能化,包括四甲基叠氮化铵、仲胺、芳基和烷基硫醇,甚至是具有挑战性的 C(sp 3 )-亲核试剂,在温和的条件下。提出了级联自由基 - 自由基偶联/亲核取代序列,其中 NHC 能够形成光活性电子供体 - 受体复合物α-碘酮合成。