Toward the stereochemical assignment of euvesperins A and B: total synthesis of the possible structures of the natural products.

The possible structures of euvesperins A and B were synthesized. The results of our synthesis suggest that euvesperin A may be a mixture of the (2,3,4,7) and (2,3,4,7) isomers and euvesperin B may be a mixture of the (2,3,4,7) and (2,3,4,7) isomers in consideration of their putative biosynthetic pathways.