Synthesis of Tetrahydro-1,2-oxazines and Pyrrolidines via Cycloadditions of Donor-Acceptor Cyclobutanes and Nitrosoarenes
作者:Naresh Vemula、Brian L. Pagenkopf
DOI:10.1002/ejoc.201500542
日期:2015.8
During efforts to expand the scope of Lewis-acid-catalyzed [4+2] cycloaddition between donor–acceptorcyclobutanes and nitrosoarenes, an unexpected formation of pyrrolidine products was discovered when 50 mol-% of MgI2 was used as a Lewis acid. It was also observed that the electronics of the nitrosoarene and judicious selection of the Lewis acid catalyst have a profound effect on the regioselectivity