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Atroposelective Synthesis of C–C Axially Chiral Compounds via Mono- and Dinuclear Vanadium Catalysis
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2022-10-07 , DOI: 10.1021/acs.accounts.2c00545
Ankit Kumar 1 , Hiroaki Sasai 1, 2 , Shinobu Takizawa 1
Affiliation  

Axially chiral compounds with rotationally constrained σ-bonds that exhibit atropisomerism are lucrative synthetic targets because of their ubiquity in functional materials and natural products. The metal complex-catalyzed enantioselective fabrication of axially chiral scaffolds has been widely investigated, and thus far, considerable progress has been made. Over the past two decades, we have developed a highly efficient strategy for constructing axially chiral biarenol derivatives using chiral mono- and dinuclear vanadium complexes. These complexes are readily prepared from vanadium(IV) salts and Schiff base ligands (generated from the condensation of (S)-tert-leucine and di- or monoformyl-(R)-1,1′-bi-2-naphthol (BINOL) derivatives) under O2 and act as highly active catalysts for highly stereoselective C–C bond formation. In particular, the vanadium complex-catalyzed enantioselective oxidative coupling of 2-naphthols 1 under oxygen or in air, which is a green oxidant, affords the desired axially chiral molecules in high yields and high stereoselectivity (up to quantitative yield and 97% ee), along with water as the sole coproduct. This coupling reaction tolerated various functional groups (such as halogens, alkoxys, and boryls) and avoided overoxidation of coupling products.

中文翻译:

单核和双核钒催化阻转选择性合成 C-C 轴向手性化合物

具有旋转约束 σ 键并表现出阻转异构现象的轴手性化合物是有利可图的合成目标,因为它们在功能材料和天然产物中普遍存在。金属配合物催化的轴向手性支架的对映选择性制备已被广泛研究,到目前为止,已经取得了相当大的进展。在过去的二十年里,我们开发了一种高效的策略,使用手性单核和双核钒配合物构建轴向手性联苯酚衍生物。这些络合物很容易由钒 (IV) 盐和席夫碱配体(由 ( S )--亮氨酸和二-或单甲酰基-( R )-1,1'-双-2-萘酚 (BINOL ) 衍生物) 在 O 2并作为高度立体选择性 C-C 键形成的高活性催化剂。特别是,钒络合物催化的 2-萘酚1在氧气或空气中的对映选择性氧化偶联,是一种绿色氧化剂,以高产率和高立体选择性(高达定量产率和 97% ee)提供所需的轴向手性分子, 以及水作为唯一的副产品。这种偶联反应可容忍各种官能团(如卤素、烷氧基和硼基)并避免偶联产物的过度氧化。
更新日期:2022-10-07
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