Nitrones 6 prepared from ester 5 underwent an intramolecularcycloaddition affording diastereomeric mixtures of tricyclic compounds 7A/B. These were separated to give the enantiopure compounds 7A and 7B. Starting from aminoalcohol 8 compounds 10A and 10B were formed via nitrones 9. Nitrone 9a yielded the trans-product 10aC in addition. X-ray analyses confirm the structure of 7aB and 10aA. Catalytic