Synthesis of Enantiomerically Pure Morphine Alkaloids: The Hydrophenanthrene Route
作者:Dirk Trauner、Jan W. Bats、Andreas Werner、Johann Mulzer
DOI:10.1021/jo9805394
日期:1998.8.1
A concise, linear, total synthesis of (-)-dihydrocodeinone-a close synthetic precursor of (-)-codeine and (-)-morphine-has been achieved. The carbocyclic core of the alkaloid was provided in the form of a phenanthrenone, which was resolved by chromatography on cellulose triacetate. A cuprate conjugateaddition was used to establish the crucial benzylic quaternary stereocenter and to introduce the C(2)-side
A concise asymmetric total synthesis of naturally occurring Amaryllidaceae alkaloids sharing dihydrobenzofuran scaffolds, (−)-galanthamine (1a), (−)-lycoramine (1b), (−)-narwedine (2a), and (−)-lycoraminone (2b), is reported. Orthoester Johnson–Claisen rearrangement of allyl alcohol (+)-9 (98% ee) in diisopropylethylamine furnished enantioenriched cyclohexene (+)-8 (97.4% ee) with a quaternary stereogenic