Stereochemie der Umwandlung von Dihydrothebain in Thebain Synthese von markierten Thebainen
作者:U. Eppenberger、M. E. Warren、H. Rapoport
DOI:10.1002/hlca.19680510219
日期:1968.1.31
AbstractThe complete stereochemistry of the Δ6‐dihydrothebaine → 7‐bromodihydrocodeinone dimethyl ketal → codeinone dimethyl ketal → thebaine sequence of transformations has been elucidated by NMR studies of the isotopically labeled compounds prepared using diimide‐d2, methyl hypobromite‐[14C], and methyl hypobromite‐d3. Final elimination of methanol from codeinone dimethyl ketal proceeds in a stereospecific manner: cis under acid catalysis with POC13, and trans under alkaline catalysis with EtO−. As a result of these reactions, variously isotopically labeled thebaines can be prepared.