Synthesis of (R)-Curcumene and (R)-Xanthorrizol Based on 1,2-Aryl Migration via Phenonium Ion
作者:Takeru Ehara、Shin Tanikawa、Machiko Ono、Hiroyuki Akita
DOI:10.1248/cpb.55.1361
日期:——
Solvolysis reaction of methyl (4S,5S)-4-(4'-methoxyphenyl)-5-tosyloxy-2(E)-hexenoate 5 in water-saturated MeNO(2) gave the 1,2-migration product, (4S,5S)-5-hydroxy-4-(4'-methoxyphenyl)-2-(E)-hexenoate 6 (55% yield), which was converted to methyl (R)-(4'-methylphenyl)hexanoate 11 in 25% overall yield (5 steps). Treatment of (R)-11 with MeLi gave tertiary alcohol congener 12, which was subjected to dehydration
(4S,5S)-4-(4'-甲氧基苯基)-5-甲苯磺酰氧基-2(E)-己酸甲酯5在水饱和的MeNO(2)中的溶剂分解反应得到1,2迁移产物(4S, 5S)-5-羟基-4-(4'-甲氧基苯基)-2-(E)-己酸6(55%收率),将其转化为25%的(R)-(4'-甲基苯基)己酸甲酯11总产量(5个步骤)。用MeLi处理(R)-11得到叔醇同类物12,将其脱水以得到(R)-(-)-姜黄烯1。在(R)中芳环的间位引入羟基。在连续处理的基础上实现了-11:[1)选择性碘化; 2)芳基碘化物转化为芳基硼酸酯; 3)芳基硼酸酯转化为苯酚]。将如此获得的苯酚(R)-16用MeLi处理,得到叔醇同类物17,将其脱水以提供(R)-(-)-黄嘌呤醇2。