Naresh Vemula, Andrew C. Stevens, Tyler B. Schon and Brian L. Pagenkopf
Chem. Commun., 2014,50, 1668-1670
DOI:
10.1039/C3CC47775D,
Communication
The Yb(OTf)3 catalyzed [4+2] cycloaddition between donor–acceptor cyclobutanes and nitrosoarenes is disclosed. This method facilitates the synthesis of tetrahydro-1,2-oxazines in good to excellent yields as single diastereomers. Except for a few electron-deficient nitrosoarenes, excellent regioselectivity was observed throughout these studies.