描述了一种新型的高效,环境友好的路易斯酸催化且无保护的方案,用于构建带有1 H-吡咯并[1,2- a ]吲哚骨架的有价值的多环产物,从容易获得的炔丙醇和2开始乙炔基苯胺。一锅转换需要裂解一个C-O键,两个C-N键和一个C-C双键。这种独特的操作简单的方法是在温和条件下和空气中进行的,产生的水是唯一的副产物。它具有可伸缩性,并显示出良好的功能组兼容性和广泛的适用范围。
short reaction time, operational simplicity, and highly efficient reaction system. This protocol, which produces water as the only byproduct, provides efficient and atom-economical access to a class of fascinating quinoline and isoquinoline products in satisfactory yields. The method is effective on the gram scale, thus highlighting the inherent practicality of this methodology.
介绍了一种新的、绿色的、无过渡金属的方案,用于在Na 2 S 2 O 8存在下,从容易获得且对环境无害的喹啉和异喹啉N-氧化物与炔丙醇开始,用于轻松修饰喹啉和异喹啉衍生物或 K 2 S 2 O 8在 100°C。一锅转化具有官能团相容性好、反应时间短、操作简单、反应体系高效等优点。该协议产生水作为唯一的副产品,提供了以令人满意的收率获得一类引人入胜的喹啉和异喹啉产品的高效和原子经济的途径。该方法在克尺度上是有效的,从而突出了该方法的内在实用性。
Synthesis of 1,6-Dihydropyridine-3-carbonitrile Derivatives <i>via</i> Lewis Acid-Catalyzed Annulation of Propargylic Alcohols with (<i>E</i>)-3-Amino-3-phenylacrylonitriles
作者:Li-Juan Du、Yuecheng Zhang、Hong-Yu Zhang、Guohui Yin、Xiao-Yan Wang、Jiquan Zhao、Ya-Ping Han
DOI:10.1021/acs.joc.0c01171
日期:2020.8.7
acid-catalyzed, highly efficient, practical, and atom-economical protocol for the synthesis of functionalized 1,2-dihydropyridine-3-carbonitrile derivatives in the presence of Bi(OTf)3 (10 mol %) in tetrahydrofuran (2.0 mL) at 80 °C for 8 h in air is described, starting from readily accessed propargylic alcohols and (E)-3-amino-3-phenylacrylonitriles. This cycloaddition protocol, which is scalable and
A new method for the efficient synthesis of hexahydro-1H-fluorene and octahydrobenzo[a]azulene derivatives through a ring-expansion strategy is reported. With an appropriate combination of thulium(III) trifluoromethanesulfonate and 13X molecular sieves, a range of unsaturated polycycliccompounds were obtained in good yields. Mechanism studies reveal that the reaction is more likely to undergo Meyer–Schuster
An unprecedented Lewisacidcatalyzed [4 + 3] cycloaddition reaction is described that provides a straightforward route to polycyclic products containing an imine-based indole azepine scaffold, starting from readily available internal tertiary alkynols and azides. This cycloaddition protocol provides efficient and atom-economical access to a new class of fascinating imine-containing products in satisfactory
tricyclic compounds possessing functionalizedpyrano[3,2‐c]chromen‐5(2H)‐one fragments has been developed using propargylic alcohols and 4‐hydroxy‐2H‐chromen‐2‐ones as the substrates. The protocol provides a one‐step, environmentally benign method of accessing a broad range of pyrano[3,2‐c]chromen‐5(2H)‐one derivatives in excellent yields undermildconditions and with good functional‐group tolerance. The method