Nitrones as trapping reagents of alpha, beta-​unsaturated carbene intermediates - [1,​2]​oxazino[5,​4-​b]​indoles by a platinum-catalyzed intermolecular [3+3] cycloaddition - Yang, Weibo; Wang, Tao; Shi, Shuai; Zhang, Tuo; Hashmi, A. Stephen K. (Advanced synthesis & catalysis, 2013)