Fig. 4: Asymmetric copper-catalyzed formal (5 + 1) annulation.
From: Copper-catalyzed intermolecular formal (5 + 1) annulation of 1,5-diynes with 1,2,5-oxadiazoles
Chiral oxadiazine 3x was obtained in 57% yield with 60% ee.
Fig. 4: Asymmetric copper-catalyzed formal (5 + 1) annulation. | Communications Chemistry
