A concise total synthesis of (±)- and (–)-okilactomycin D

Niu, D.; Hoye, T. R. Org. Lett. 2012, 14, 828–831. 

"The spirotetronate okilactomycin D (7) has been efficiently synthesized by a route featuring a substrate-controlled, diastereoselective (8:1) intramolecular Diels–Alder (IMDA) reaction of 11. The assigned absolute configuration of (−)-7 was confirmed."