Concise asymmetric total syntheses of (−)-nuciferol, (−)-nuciferal, and (−)-dihydrocurcumene via Rh(I)-catalyzed boronic acid addition
作者:Souvik Pal、Arindam Khatua、Mrinal K. Das、Vishnumaya Bisai
DOI:10.1016/j.tetlet.2020.152790
日期:2021.2
general catalytic asymmetric total synthesis of aromatic bisabolane sesquiterpenes, (−)-nuciferol (ent-1c), (−)-nuciferal (ent-1d), and (−)-dihydrocurcumene (ent-1h) have been achieved in 5–6 steps in high chemical yields from commercially available (E)-ethylcrotonate. A key catalytic enantioselective boronic acid addition onto (E)-crotonate in the presence of Rh(I)-(S)-BINAP afforded enantioenriched
在5–年内已实现了芳香族双五倍半萜倍半萜,(-)-核苷(ent - 1c),(-)-核苷(ent - 1d)和(-)-二氢姜黄素(ent - 1h)的一般催化不对称全合成。从商业上可获得的(E)-巴豆酸乙酯以高化学收率进行6步操作。在Rh(I)-(S)-BINAP存在下,关键的催化对映选择性硼酸加成到(E)-巴豆酸酯上,可以得到具有苄基立体中心的富含对映体的产物,收率为93%,ee可达99%以上。