The allyl alcohol (11) derived from the dihydropyridinone (8) by a few steps was transformed into the ester (15) via the Claisen rearrangement, oxidation, esterification, and then hydrogenation. N-Chlorination of 15 followed by a basic hydrolysis afforded the lactone (3) exclusively which was converted into (±)-eburnamonine (1) by the known sequence.
由
二氢吡啶酮(8)经过几个步骤衍生的
烯丙醇(11),经过克莱森重排、氧化、酯化和氢化,转化为酯(15)。 15的N-
氯化,然后进行碱性
水解,仅得到内酯(3),通过已知的顺序将其转化为(±)-依苯那莫宁(1)。