From Amino Acids to Polycyclic Heterocycles - Synthesis of Enantiopure, Functionally Diverse Isopavines and Dihydromethanodibenzoazocines
摘要:
The intramolecular double Friedel-Crafts condensation of N,N-dibenzyl-O-benzyl-L-threoninal affords a rearranged tetracyclic compound involving a methyl migration. N-Demethylation of tetracyclic isopavines leads to topologically unique secondary amines with potential utility in catalytic reactions as a chiral basic ligand.
synthetic chemist. The topologically interesting isopavine nucleus, with an orthogonal orientation of two aryl groups, can be obtained as two diastereomeric structures, depending on the course of a [1,2]-Stevens rearrangement. When viewed as a constrained piperidine, a close spatial relationship with morphine (1) becomes apparent. Indeed, tetracyclic isopavine 2 exhibits morphine-like activity toward the
synthesis of potential morphinomimetics as agonists of the human mu receptor. The well-known class of alkaloids represented by the isopavine nucleus has a topological resemblance to the morphine skeleton, especially when viewed in a particular way. Enantiopure isopavines can be readily obtained from a 1,2 Stevens rearrangement of 13-substituted dihydromethanodibenzoazocines, prepared in four steps from
The intramolecular double Friedel-Crafts condensation of N,N-dibenzyl-O-benzyl-L-threoninal affords a rearranged tetracyclic compound involving a methyl migration. N-Demethylation of tetracyclic isopavines leads to topologically unique secondary amines with potential utility in catalytic reactions as a chiral basic ligand.