New atropoisomeric alkenylphenylglycine derivatives: Synthesis of (5R*)- and (5S*)-isomers of (1R*,3aR*,4S*,11S*)-3a,5,9,11-tetramethyl-4,5-dihydro-3aH-1,4-methano[1,3]oxazolo[3,2-a]quinolin-2-one
Keywords: [3+2]-cycloaddition; Alkenylaniline; Aromatic amino Claisen rearrangement; Atropisomerism; Ketene; Münchnone; Methanooxazoloquinoline;