The title dienones (2) and (5) were prepared from the chiral alcohols (7a) and (7b) respectively. These key starting materials were in turn available from the reduction of 3-acetyl-5-benzyloxy-8-methoxy-1,2- dihydronaphthalene (6a) and 3-acetyl-8-benzyloxy-5-methoxy-1,2- dihydronaphthalene (6b) with lithium aluminium hydride modified with (—)-N- methylephedrine and N- ethylaniline . Chiral phase high-pressure liquid chromatography was used to analyse the enantioselectivity of these reductions which were shown to yield variable results depending upon the origin of the reducing agent.
标题二烯酮 (2) 和 (5) 分别由手性醇 (7a) 和 (7b) 制备而成。这些关键的起始原料又是由 3-乙酰基-5-苄氧基-8-甲氧基-1,2-二氢萘 (6a) 和 3-乙酰基-8-苄氧基-5-甲氧基-1,2-二氢萘 (6b) 与经 (-)-N- 甲基麻黄碱和 N- 乙基苯胺修饰的氢化铝锂进行还原得到的。 手性相高压液相色谱法用于分析这些还原反应的对映体选择性,结果表明,不同还原剂的来源会产生不同的结果。