Approach to highly functionalized oxazolones by a Pd-catalyzed cyclization of N-alkynyl tert-butyloxycarbamates
作者:Zenghui Lu、Xiaowei Xu、Zhaozhen Yang、Lichun Kong、Gangguo Zhu
DOI:10.1016/j.tetlet.2012.04.074
日期:2012.7
A mild and operationally simple approach to highly functionalized oxazolones has been developed, which involves an intramolecular oxypalladation of N-alkynyl tert-butyloxycarbamates, followed by either protonolysis of the alkenyl C-Pd bond to afford 3,5-disubstituted oxazolones or allylation with allyl halides in the presence of Ag2CO3 to generate 3,4,5-trisubstituted oxazolones, respectively. (C) 2012 Elsevier Ltd. All rights reserved.