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。
Nucleophilic Aromatic Substitution on Tricarbonylchromium-complexed Haloarenes: Synthesis of<i>O</i>-Aryloximes and Their Cyclization to Benzofurans
作者:Andreina Alemagna、Clara Baldoli、Paola Del Buttero、Emanuela Licandro、Stefano Maiorana
DOI:10.1055/s-1987-27888
日期:——
A series of O-aryloximes have been prepared from tricarbonylchromium-complexed haloarenes in mild conditions. Title compounds are starting materials for benzofuran synthesis.