Integrating Metal-Catalyzed C–H and C–O Functionalization To Achieve Sterically Controlled Regioselectivity in Arene Acylation
作者:Nicholas A. Serratore、Constance B. Anderson、Grant B. Frost、Truong-Giang Hoang、Steven J. Underwood、Philipp M. Gemmel、Melissa A. Hardy、Christopher J. Douglas
DOI:10.1021/jacs.8b06476
日期:2018.8.8
organometallic chemists is the direct functionalization of the bonds most recurrent in organic molecules: C-H, C-C, C-O, and C-N. An even grander challenge is C-C bond formation when both precursors are of this category. Parallel to this is the synthetic goal of achieving reaction selectivity that contrasts with conventional methods. Electrophilic aromatic substitution (EAS) via Friedel-Crafts acylation
有机金属化学家的一个主要目标是将有机分子中最常见的键直接官能化:CH、CC、CO 和 CN。当两种前体都属于此类时,更大的挑战是 CC 键的形成。与此并行的是实现与传统方法形成对比的反应选择性的合成目标。通过 Friedel-Crafts 酰化的亲电芳香取代 (EAS) 是合成芳基酮的最著名方法,芳基酮是许多药物、农用化学品、香料、染料和其他商品化学品的常见结构基序。然而,只有当所需的酰化位点与反应的电子控制区域选择性一致时,EAS 合成策略才有效。在此,我们报告了空间控制的区域选择性芳烃酰化与水杨酸酯通过铱催化获得明显取代的二苯甲酮。实验和计算数据表明,一种独特的反应机制将 CO 活化和 CH 活化与单一铱催化剂相结合,无需外源氧化剂或碱。我们公开了对芳烃和酯成分的合成范围的广泛探索,最终以简明的合成强效抗癌剂羟基苯司他汀。
Deoxygenative Arylation of Carboxylic Acids by Aryl Migration
phosphoranyl radical chemistry allows for precise cleavage of a stronger C-O bond and formation of a weaker C-Cbond by 1,5-aryl migration under mild reaction conditions. This new protocol is independent of substrate redox-potential, electronic, and substituent effects. It affords a general and promising access to 60 examples of synthetically versatile o-amino and o-hydroxy diaryl ketones under redox-neutral
Intermolecular C–O addition of carboxylic acids to arynes: synthesis of o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones
作者:Anton V. Dubrovskiy、Richard C. Larock
DOI:10.1016/j.tet.2013.01.078
日期:2013.4
An efficient and simple route to biologically and pharmaceutically important o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones has been developed utilizing readily available carboxylic acids and commercially available o-(trimethylsilyl)aryl triflates.
Intermolecular C−O Addition of Carboxylic Acids to Arynes
作者:Anton V. Dubrovskiy、Richard C. Larock
DOI:10.1021/ol101017z
日期:2010.7.16
A novel, efficient, and expedient route to biologically and pharmaceutically important o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones has been developed starting from readily available carboxylic acids and commercially available o-(trimethylsilyl)aryl triflates.
Palladium-catalyzed direct <i>mono</i>-aroylation of <i>O</i>-arylmethyl and aryl-substituted acetoxime ethers
作者:Ling-Yan Shao、Zhi Xu、Cun-Ying Wang、Xiao-Pan Fu、Miao-Miao Chen、Hong-Wei Liu、Ya-Fei Ji
DOI:10.1039/c8ob01400k
日期:——
An efficient palladium-catalyzed ortho-aroylation of O-arylmethyl and aryl-substituted acetoxime ethers has been developed; this method has high mono-site selectivity and does not require exogenous ligands. Under the direction of a simple exo-acetoxime auxiliary, a broad scope of masked arylmethyl alcohols and phenols as well as various aromatic aldehydes are compatible with this transformation, which
已经开发出一种有效的钯催化的O-芳基甲基和芳基取代的乙肟醚的邻芳基化反应。这种方法具有较高的单上门的选择性,并且不需要外源性配体。在简单的外切-乙酰肟辅助剂的指导下,各种掩蔽的芳基甲醇和苯酚以及各种芳族醛均与这种转化相容,这很可能遵循一种涉及六元或五元外-环palpalated中间体的机制途径。可以方便地采用该策略来制备具有合成价值的1 H-苯并[ d ] [1,2]恶嗪和苯并[ d]异恶唑。可以容易地从产物中除去导向基团,以提供官能化的二芳基酮。