Robust Synthesis of <i>N</i>-Sulfonylazetidine Building Blocks via Ring Contraction of α-Bromo <i>N</i>-Sulfonylpyrrolidinones
作者:Nicolas Kern、Anne-Sophie Felten、Jean-Marc Weibel、Patrick Pale、Aurélien Blanc
DOI:10.1021/ol5029496
日期:2014.12.5
A simple and robust one-pot nucleophilic addition–ring contraction of α-bromo N-sulfonylpyrrolidinones has been achieved toward α-carbonylated N-sulfonylazetidines. In the presence of potassium carbonate, various nucleophiles, such as alcohols, phenols or anilines, have been efficiently incorporated into the azetidine derivatives. Moreover, the α-bromopyrrolidinone precursors could be selectively obtained
对α-羰基化的N-磺酰基氮杂环丁烷,已经实现了一种简单而健壮的α-溴N-磺酰基吡咯烷酮单罐亲核加成环收缩。在碳酸钾的存在下,各种亲核试剂,例如醇,酚或苯胺,已被有效地掺入氮杂环丁烷衍生物中。而且,可以通过廉价和容易获得的N-磺酰基-2-吡咯烷酮衍生物的单溴化,以高收率选择性地获得α-溴吡咯烷酮前体。