Concise Formal Synthesis of (+)-Englerin A and Total Synthesis of (-)-Orientalol F: Establishment of the Stereochemistry of the Organocatalytic [4+3]-Cycloaddition Reaction

The enantioselective formal synthesis of (+)-englerin A and the total synthesis of (-)-orientalol F were successfully accomplished via a triene. The success enabled establishment of the relative as well as absolute stereochemistry of the organocatalytic [4+3]-cycloaddition reaction.