Asymmetric Synthesis of Allylic Fluorides via Fluorination of Racemic Allylic Trichloroacetimidates Catalyzed by a Chiral Diene-Iridium Complex
作者:Jason C. Mixdorf、Alexandre M. Sorlin、Qi Zhang、Hien M. Nguyen
DOI:10.1021/acscatal.7b03786
日期:2018.2.2
The ability to use racemic allylic trichloroacetimidates as competent electrophiles in a chiral bicyclo[3.3.0]octadiene-ligated iridium-catalyzed asymmetric fluorination with Et3N·3HF is described. The methodology represents an effective route to prepare a wide variety of α-linear, α-branching, and β-heteroatom substituted allylic fluorides in good yields, excellent branched-to-linear ratios, and high
描述了在Et 3 N·3HF手性双环[3.3.0]辛二烯连接的铱催化的不对称氟化反应中使用外消旋烯丙基三氯乙亚氨酸盐作为感受态亲电试剂的能力。该方法代表了一种以高收率,出色的支化-线性比率和高对映选择性制备各种α-线性,α-支化和β-杂原子取代的烯丙基氟化物的有效途径。另外,该催化体系可修正光学活性的烯丙基三氯乙酰亚氨酸酯底物的氟化,以高收率提供氟化产物,并且具有专门的支链选择性。使用(R,R)或(S,观察到S)-双环[3.3.0]辛二烯配体。氟化过程的合成用途在15氟化前列腺素和神经保护剂P7C3-A20的不对称合成中得到了说明。