R. Suau

Oxocompostelline and oxocularine, structure and synthesis

Abstract Structures ( 1 ) and ( 2 ) were deduced for these two new oxocularine alkaloids from spectral data and synthesis. The latter was achieved by a novel approach based on intramolecular cyclization between a phenoxide and an intermediate benzyne.

New phenolic isocularine and benzylisoquinoline alkaloids and their biogenetic relationship

Abstract The first three phenolic isocularines and the first diphenolic 7,8,3′,4′-tetraoxygenated tetrahydrobenzylisoquinoline were isolated from Sarcocapnos crassifolia. A pathway for the biogenesis of cularine is considered.

New oxidized isocularine alkaloids from sarcocapnos plants

Abstract Structures 1a, 3 and 6 were deduced for the new oxoisocularine alkaloids, oxosarcophylline, yagonine and aristoyagonine, respectively, on the basis of spectroscopic studies and synthesis.

The total synthesis of cannithrene-2

The first total synthesis of cannithrene-2 (1), a 4,5-disubstituted phenanthrene, is reported. It is based on the regioselective cyclization of a key cyclophane (2) with a rigid cis-stilbene moiety.

Ribasidine, a new ribasine alkaloid. Structure and characterization

Abstract Ribasidine ( 5 ), isolated from Sarcocapnos enneaphylla and Corydalis claviculata, has been proved to be a 13-β=hydroxyribasine alkaloid. Some chemical properties of the ribasine alkaloids are also described.

Celtine, celtisine and breoganine, new phenolic cularine alkaloids from fumariaceae

Abstract Three new phenolic cularines have been isolated from Sarcocapnos and Corydalis species. Their structures have been elucidated on the basis of spectroscopic studies and chemical transformations.

Arosine and arosinine, two new quaternary oxoaporphine alkaloids

Abstract Structure of (I) and (II) were deduced from spectral data, chemical evidence and synthesis.

(—)-Dehydronorchelindonine and (—)-Isodidehydrochelidonine, Two Probable Biogenetic Precursors in the Benzophenanthridine Series of Isoquinoline Alakaloids

Description de la synthese des composes du titre a partir de (−)-norchelidonine. Le role biogenetique probable est etudie par oxydation avec un oxydant a un electron