3-Aryl-l-iodoisoquinoline synthesis is developed using titanium tetraiodide induced cyclization of cyanoketones. The method is applied to the short step formal synthesis of CWJ-a-5 having a topoisomerase I inhibitory activity. 3-Iodo-1-phenylisoquinoline synthesis is also reported under the similar reaction conditions.
Me<sub>3</sub>Al-mediated domino nucleophilic addition/intramolecular cyclisation of 2-(2-oxo-2-phenylethyl)benzonitriles with amines; a convenient approach for the synthesis of substituted 1-aminoisoquinolines
作者:Krishna M S Adusumalli、Lakshmi N S Konidena、Hima B Gandham、Krishnaiah Kumari、Krishna R Valluru、Satya K R Nidasanametla、Venkateswara R Battula、Hari K Namballa
DOI:10.3762/bjoc.17.186
日期:——
amines in the presence of Me3Al. The reaction proceeds via a domino nucleophilic addition with subsequent intramolecular cyclisation. This method provides a wide variety of substituted 1-aminoisoquinolines with good functional group tolerance. Furthermore, the synthetic utility of this protocol was demonstrated in the successful synthesis of the antitumor agent CWJ-a-5 in gram scale.
通过在 Me 3 Al存在下用胺处理 2-(2-oxo-2-苯乙基) 苄腈,实现了一种用于构建 1-氨基异喹啉的简单有效的方案。该反应通过多米诺亲核加成和随后的分子内环化进行。该方法提供了多种具有良好官能团耐受性的取代 1-氨基异喹啉。此外,该协议的合成效用在克级抗肿瘤剂 CWJ-a-5 的成功合成中得到了证明。
Tandem Addition/Cyclization for Access to Isoquinolines and Isoquinolones via Catalytic Carbopalladation of Nitriles
sequential nucleophilic addition followed by an intramolecular cyclization of functionalized nitriles with arylboronic acids has been achieved, providing an efficient synthetic pathway to access structurally diverse isoquinolines and isoquinolones. This methodology has also been successfully applied to the total synthesis of the topoisomerase I inhibitor CWJ-a-5 (free base).
Cascade of C(sp<sup>2</sup>)–H Addition to Carbonyl and C(sp<sup>2</sup>)–CN/C(sp<sup>2</sup>)–H Coupling Enabled by Brønsted Acid: Construction of Benzo[<i>a</i>]carbazole Frameworks
作者:Ling Tang、Shuangshuang Jiang、Xinmiao Huang、Zhiyong Song、Jian-bo Wang、Ming Ma、Bo Chen、Yuanhong Ma
DOI:10.1021/acs.orglett.2c01027
日期:2022.5.6
C(sp2)–H addition to carbonyl and the C(sp2)–CN/C(sp2)–H coupling of 2-(2-oxo-2-arylethyl)benzonitriles with indoles enabled by commercially available TsOH·H2O. The protocol represents the first metal-free C(sp2)–CN/C(sp2)–H coupling, affording a new route for the synthesis of various benzo[a]carbazole derivatives with a broad substrate scope, highyields, and simple conditions.
Electrochemical Aerobic Oxygenation and Nitrogenation of Cyclic Alkenes via C═C Bond Cleavage or Oxygenation and Azidation of Open-Chain Alkenes
作者:Yan Zhu、Cong Jiang、Heng Li、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.2c01293
日期:2022.8.19
electrochemical C═C double-bond cleavage and functionalization of cyclic alkenes for the synthesis of ketonitriles is described. This transformation features environmentally friendly conditions and utilizes relatively safe TMSN3 as the nitrogenation reagent and molecular oxygen as the oxidant. For the open-chain alkenes, the reaction gave 1,2-difunctionalized products. A wide range of cyclic alkenes and open-chain
for the activation of nitrile towards nucleophilic addition and subsequent annulation under an aqueous medium for the first time. The protocol divulges an efficient and atom economical route for the construction of diverse aminated isoquinolines. Differently substituted primary as well as secondary amines underwent the reaction in a highly regioselective manner. The reaction is operationally simple