研究通讯

铱催化串联不对称烯丙基取代/双键异构化构建轴手性化合物

  • 赵庆如 ,
  • 蒋茹 ,
  • 游书力
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  • a 中国科学院上海有机化学研究所 金属有机化学国家重点实验室 上海 200032
    b 上海科技大学 物质科学与技术学院 上海 201210

收稿日期: 2021-07-11

  网络出版日期: 2021-08-17

基金资助

项目受国家自然科学基金(21821002); 项目受国家自然科学基金(21961132002); 上海市科学技术委员会(19590750400)

Ir-catalyzed Sequential Asymmetric Allylic Substitution/Olefin Isomerization for the Synthesis of Axially Chiral Compounds

  • Qing-Ru Zhao ,
  • Ru Jiang ,
  • Shu-Li You
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  • a State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
    b School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Received date: 2021-07-11

  Online published: 2021-08-17

Supported by

National Natural Science Foundation of China(21821002); National Natural Science Foundation of China(21961132002); Science and Technology Commission of Shanghai Municipality(19590750400)

摘要

轴手性化合物是一类重要的手性化合物, 其中苯乙烯类轴手性化合物因其轴手性稳定性相对较差, 目前高效不对称合成的方法比较局限. 本工作以β-萘酚作为亲核试剂, 通过将金属铱催化不对称烯丙基取代与双键异构化串联, 实现了中心手性到轴手性的转移, 从而高效地合成了一系列β-萘酚衍生的苯乙烯类轴手性化合物.

本文引用格式

赵庆如 , 蒋茹 , 游书力 . 铱催化串联不对称烯丙基取代/双键异构化构建轴手性化合物[J]. 化学学报, 2021 , 79(9) : 1107 -1112 . DOI: 10.6023/A21070320

Abstract

Axially chiral compounds represent an important class of chiral molecules. In this regard, many methods have been developed to access these compounds. However, efficient methods for the synthesis of axially chiral styrenes are limited to date, mainly due to their relative instability compared to axially chiral biaryl compounds. Iridium-catalyzed asymmetric allylic substitutions have evolved as a powerful tool in constructing C―C or C―X bonds at the allylic position. We developed an efficient sequential strategy to access a series of axially chiral styrenes by iridium-catalyzed allylic substitution and central-to-axial chirality transfer via olefin isomerization. With the iridium complex derived from [Ir(cod)Cl]2 and Alexakis ligand L1 as catalyst, and β-naphthol as nucleophiles, a broad range of axially chiral styrenes were obtained with moderate to excellent yields (28%~97% yields) and enantioselectivity (59%~98% ee). A general procedure for the asymmetric allylation of β-naphthol is described as the following: A flame-dried Schlenk tube was cooled to room temperature and filled with argon. To this flask were added [Ir(cod)Cl]2 (2.6 mg, 0.004 mmol, 2 mol%), (S,S,Sa)-L1 (4.8 mg, 0.008 mmol, 4 mol%), freshly distilled tetrahydrofuran (THF, 0.5 mL) and propylamine (0.5 mL). The mixture was stirred at 50 ℃ for 30 min and then the low-boiling solvents were removed in vacuo to give a pale yellow solid. The solid was stirred at 50 ℃ again under vacuum until it became a powder. After that, β-naphthol 1 (0.22 mmol, 1.1 equiv.), allyl carbonate 2 (0.2 mmol, 1.0 equiv.), 1,4-diazobicyclo(2.2.2)octane (DABCO) (67.3 mg, 0.6 mmol, 3.0 equiv.) and freshly distilled Et2O (2.0 mL) were added to this flask under argon atmosphere. The reaction mixture was stirred at 20 ℃ until the starting material was consumed (monitored by thin layer chromatography, TLC). The crude reaction mixture was diluted with water (5 mL), and extracted with dichloromethane (DCM, 5 mL×3). The organic layers were collected, dried over Na2SO4 and then concentrated in vacuo to afford the crude product. The residue was purified by preparative TLC to afford the product.

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