title: The [4+2] cycloaddition of donor-acceptor cyclobutanes and nitrosoarenes.
abstract: 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.
authors.affiliation: Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7. bpagenko@uwo.ca.
authors.forename: Naresh
authors.initials: N
authors.lastname: Vemula
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Stevens
authors.forename: Tyler B
authors.initials: TB
authors.lastname: Schon
authors.forename: Brian L
authors.initials: BL
authors.lastname: Pagenkopf