Concise Entry to Both Enantiomers of 8-Oxabicyclo[3.2.1]oct-3-en-2-one Based on Novel Oxidative Etherification: Formal Synthesis of (+)-Sundiversifolide
摘要:
Both enantiomers of 8-oxabicyclo[3.2.1]oct-3-en-2-one (6) have been synthesized from 4-hydroxycyclohept-2-enone (3) on the basis of a novel oxidative cyclo-etherification using PhI(OH)OTs (Koser's reagent). (-)-(1S,5R)-8-Oxabicyclo[3.2.1]oct-3-en-2-one [(-)-6, 95% ee] was expeditiously transformed to (-)-sundiversifolide (1).