Synthesis of compounds related to endo-6,14-ethenotetrahydrothebaines

Abstract
Diels–Alder adducts obtained from 6-methoxy-N-methyl-1,2,3,4,7,8-hexahydroisoquinoline and from 7-methoxy-N-methyl-1,2,3,4,5,6-hexahydroisoquinoline with ethyl acrylate, methyl vinyl ketone, and acrylonitrile are described.