Beilstein J. Org. Chem.2015,11, 302–312, doi:10.3762/bjoc.11.35
ring opening into atropoisomeric oxazolium betaines and cyclization. Azirinium ylides generated from 2,3-di- and 2,2,3-triaryl-substituted azirines give rise to only 2-azabuta-1,3-dienes and/or 2H-1,4-oxazines.
Keywords: 2-azabuta-1,3-dienes; azirines; diazo compounds; nitrogenylides; 2H-1,4-oxazines
PDF
Graphical Abstract
Scheme 1:
Rh(II)-catalyzed synthesis of photochromic 2H-1,4-oxazines from 2H-azirines and α-diazo-β-ketoester...