作者感谢西班牙国家科学与创新部长 (MICINN)(项目 CTQ2010-17436)、Consejo Superior de Investigaciones Cientificas(项目 2008MX0044;JAE AA 博士前奖学金)、Gobierno de Aragon(研究组 E40)和墨西哥国家委员会Ciencia y Tecnologia (CONACYT)(项目 62271 和 J000.400/2009)提供资金支持。
Triphenylphosphine-assisted dehydroxylative Csp<sup>3</sup>–N bond formation <i>via</i> electrochemical oxidation
作者:Zhimin Xu、Yue Zheng、Zhihui Wang、Xiaoqing Shao、Lifang Tian、Yahui Wang
DOI:10.1039/c9cc08622f
日期:——
A dehydroxylative Csp3-N coupling reaction assisted by triphenylphosphine has been developed through electrochemicaloxidation. The reaction proceeds via anodic oxidation of triphenylphosphine to generate its corresponding radical cation, followed by reacting with hydroxyl groups to form alkoxy triphenylphosphonium ions, which are trapped by azoles or amides to construct C-N bonds. This method provides
functionalized dihydro-[1,3]oxazino[4,3-a] isoindole and tetrahydroisoquinoline skeletons has been developed through the addition-cyclization process of ynamides 8 with N-acyliminium ions generated from N,O-acetals 6,7. The reactions were conducted under the catalysis of Cu(OTf)2, and a number of functionalized dihydro-[1,3]oxazino[4,3-a] isoindoles 9a-9y and tetrahydroisoquinolines 10a-10g, 11a-11p
A new approach to access 1-benzylisoindoline and 1-benzyl-tetrahydroisoquinoline has been developed through nucleophilic addition of organozincreagents to N,O-acetals. A number of substituted organozincreagents were amenable for this transformation, and the desired products were obtained with excellent yields. Moreover, Sc(OTf)3 proved to be an effective catalyst for the formation of 1-benzylisoindoline