Stereoselective One-Pot Method for the Introduction of an Amino Group to a Cyclohexane Ring. Preparation of the Octahydroisobenzofuro[7a,1-d]oxazole Ring System
Stereoselective One-Pot Method for the Introduction of an Amino Group to a Cyclohexane Ring. Preparation of the Octahydroisobenzofuro[7a,1-<i>d</i>]oxazole Ring System
Stereoselective one-pot synthesis of octahydroisobenzofuro[7a,1-d]-oxazole-2,5-diones 7-14 via base-catalyzed addition-cyclization reaction of hydroxy lactones 4a-4d with various isocyanates 5a-5f is described. The ring system contains diastereoselectively regulated three contiguous asymmetric carbons.