Asymmetric total syntheses of (–)-ar-turmerone, (–)-dihydro-ar-turmerone, (–)-ar-dehydrocurcumene, and (–)-ar-himachalene via a key allylic oxidative rearrangement
作者:Arindam Khatua、Souvik Pal、Mrinal K. Das、Vishnumaya Bisai
DOI:10.1016/j.tetlet.2021.153105
日期:2021.6
synthesis is the allylic oxidative rearrangement following a [3,3]-sigmatropic rearrangement (Dauben oxidation) of tertiary allylic alcohol of natural product 2a. The enantioselectivity of 2a has been introduced via a Rh(I)-(S)-BINAP catalyzed p-tolylboronic acid addition onto E-ethylcrotonate. Thus, the total syntheses of (–)-ar-turmerone (1a), (-)-dihydro-ar-turmerone (1b) and (-)-ar-himachalene (3) has
从天然存在的 2-methyl-6-(4'-methylphenyl)-3-hepten-2-ol ( 2a ) 中设想了一种受自然启发的氧化芳香族红没药醇的策略。在此合成中使用的关键方法是烯丙基氧化重排后 [3,3]-sigmatropic 重排(道本氧化)的天然产物2a叔烯丙醇。2a的对映选择性是通过 Rh(I)-(S)-BINAP 催化的对甲苯基硼酸加成到E-乙基巴豆酸酯上来引入的。因此,(-)- ar -turmerone ( 1a ), (-)- dihydro - ar -turmerone ( 1b ) 和 (-)- ar-himahalene ( 3 ) 仅在 6-7 个步骤中实现。