The N-methyl group of mesembrine (1) was split off via reaction of chloroformic acid p-nitrophenyl ester on the keto-protected alkaloid. O-Demethylation of 1 with borontribromide produced simultaneous ring closure between the carbonyl function and the aromatic part of the molecule.
[EN] DELIVERY OF THERAPEUTIC ALKALOID COMPOUNDS<br/>[FR] ADMINISTRATION DE COMPOSÉS ALCALOÏDES THÉRAPEUTIQUES
申请人:SENSORIUM THERAPEUTICS INC
公开号:WO2023076586A1
公开(公告)日:2023-05-04
Disclosed are prodrug compounds that can be converted to mesembrine under biologically relevant conditions, such as hydrolysis in vivo; and related methods of preparing and using these compounds. Stable preparations of isolated mesembrine stereoisomers are also provided.
Domino Double Michael−Claisen Cyclizations: A Powerful General Tool for Introducing Quaternary Stereocenters at C(4) of Cyclohexane-1,3-diones and Total Synthesis of Diverse Families of Sterically Congested Alkaloids
Reactions of substituted acetone derivatives with acrylic acid esters (>200 mol %) in the presence of t-BuOK (200 mol %) in t-BuOH-THF (1:1 by volume) turned out to proceed as a cascade process consisting of the first Michael addition, the second Michael addition, and the last Claisenreaction to afford 4,4-disubstituted cyclohexane-1,3-diones. Only more substituted enolates play the role of a Michael