Figure 5: A reaction with isoindoline.

The reaction of isoindoline with 1a and 2a afforded N-allyl isoindole 6, which was converted to 7 by Diels–Alder reaction with N-methylmaliemide. equiv, equivalent.
The reaction of isoindoline with 1a and 2a afforded N-allyl isoindole 6, which was converted to 7 by Diels–Alder reaction with N-methylmaliemide. equiv, equivalent.