Mild Metal‐Free Tandem α‐Alkylation/Cyclization of
<i>N</i>
‐Benzyl Carbamates with Simple Olefins
作者:Heinrich Richter、Roland Fröhlich、Constantin‐Gabriel Daniliuc、Olga García Mancheño
DOI:10.1002/anie.201202379
日期:2012.8.20
Easy does it! The chemoselective oxidative α‐C(sp3)H alkylation/cyclization reaction of N‐benzyl carbamates using simple mono‐, di‐, and trisubstituted olefins provides functionalized N‐heterocycles such as oxazinones (see picture). A TEMPO oxoammonium salt serves as the oxidant, making it possible to carry out the reaction at low temperatures. Neither a metal catalyst nor preactivation in the α‐position
轻而易举!化学选择性氧化α-C(SP 3) h的烷基化/环化反应Ñ使用简单的单,二,和三取代的烯烃-苄基氨基甲酸酯官能提供N-杂环如oxazinones(见图)。甲TEMPO氧代铵盐用作氧化剂时,使得能够进行低温下的反应。既不需要金属催化剂,也不需要在氮位置的α位进行预活化。