Fig. 5
From: Enantioselective [3+3] atroposelective annulation catalyzed by N-heterocyclic carbenes
Scope of Diels–Alder reaction. Reaction conditions: a mixture of 8 (0.1 mmol), 9 (1.0 mmol), in toluene (2.0 mL) was stirred at room temperature for 72 h
