Ring Expansion-Annulation Strategy for the Synthesis of Substituted Azulenes and Oligoazulenes. 2. Synthesis of Azulenyl Halides, Sulfonates, and Azulenylmetal Compounds and Their Application in Transition-Metal-Mediated Coupling Reactions
作者:Aimee L. Crombie、John L. Kane、Kevin M. Shea、Rick L. Danheiser
DOI:10.1021/jo048698c
日期:2004.12.1
Stille, and Suzuki coupling reactions. Reaction of the azulenyl triflate 84 with pinacolborane provides access to the azulenylboronate 91, which participates in Suzuki coupling reactions with alkenyl and aryl iodides. The application of these coupling reactions to the synthesis of biazulenes, terazulene 101, and related oligoazulenes is described, as well as the preparation of the azulenyl amino acid
基于β'-溴-α-重氮酮与羧酸铑的反应,描述了用于合成取代的天青烯的“环扩环策略”。关键的转化涉及分子内布希纳反应,然后进行β-消除溴化物,互变异构化,以及原位捕集作为羧酸酯或三氟甲酸酯的1-羟基azulene。通过使用Heck,Negishi,Stille和Suzuki偶联反应,可以实现对z烯基卤化物和磺酸盐环化产物的进一步合成精制。三氟甲磺酸祖z烯基84与频哪醇硼烷的反应提供了接近氮杂氮烯基硼酸酯91的途径参与与烯基和芳基碘化物的Suzuki偶联反应。描述了将这些偶联反应应用于合成双氮杂唑,萜唑烯101和相关的寡聚丁二烯,以及制备氮杂烯基氨基酸衍生物110。