Compounds 9 and 29 were prepared as shown in Scheme 11. The methyl ester of 2 was treated with allyl bromide in the presence of sodium methoxide to give IV, which was hydrolyzed to the acid 9. The ester IV was subjected to Claisen rearrangement conditions to yield the lactone 29. The syntheses of compounds 15, 16, and 31-34 are shown in Scheme 111. The lactone 17 was reacted with an appropriately substituted benzaldehyde to give ...
