Gold‐catalyzed cascadereactions allow the rapidelaboration of pentacyclic indolo[2,3‐a]quinolizidines from N‐allyl tryptamines and ortho‐alkynylarylaldehydes. The tandem process combines a gold‐catalyzed Pictet‐Spengler reaction and a cyclization occurring concomitantly with an allyl transfer from the nitrogen atom to the stilbene function. Various substituted allyls were successfully transferred
金催化的级联反应可快速合成N-烯丙基色胺和邻炔基芳基醛中的五环吲哚[2,3- a ]喹唑烷。串联过程结合了金催化的Pictet-Spengler反应和伴随从氮原子到二苯乙烯官能团的烯丙基转移而发生的环化反应。成功地转移了各种取代的烯丙基,从而提供了高非对映选择性的典型产物,产率为60-98%。带有丁烯醇链的色胺在高非对映选择性下会进一步环化成手性半胱氨酸。
ZnCl2-catalyzed [4 + 2] benzannulation of 2-ethynylbenzaldehydes with alkynes: Selective synthesis of naphthalene derivatives
作者:Xiao-Li Fang、Ri-Yuan Tang、Xing-Guo Zhang、Ping Zhong、Chen-Liang Deng、Jin-Heng Li
DOI:10.1016/j.jorganchem.2010.09.062
日期:2011.1
Zn-catalyzed [4 + 2] benzannulation of 2-ethynylbenzaldehydes with alkynes is described for the selectivesynthesis of naphthalene derivatives. In the presence of ZnCl2, a variety of 2-ethynylbenzaldehydes underwent the [4 + 2] benzannulation reactions with alkynes to selectively afford the corresponding naphthalene derivatives in moderate to good yields.
PdCl2-Catalyzed Domino Reactions of 2-Alkynylbenzaldehydes with Indoles: Synthesis of Fluorescent 5H-Benzo[b]carbazol-6-yl Ketones
作者:Ri-Yuan Tang、Jin-Heng Li
DOI:10.1002/chem.201000133
日期:2010.4.26
selective Pd‐catalyzed dominoreaction of 2‐alkynylbenzaldehydes with indoles has been developed for the synthesis of 5H‐benzo[b]carbazol‐6‐yl ketones. The isobenzopyrylium complex is trapped by indole at room temperature to give 3‐(1H‐isochromen‐1‐yl)‐1H‐indoles, which can be transformed into 5H‐benzo[b]carbazol‐6‐yl ketones by raising the temperature (see scheme). These ketones exhibit intense fluorescence
合成方法:已开发出一种新的,选择性的Pd催化的2-炔基苯甲醛与吲哚的多米诺反应,用于合成5 H-苯并[ b ]咔唑-6-基酮。室温下,吲哚会俘获异苯并吡啶鎓配合物,从而生成3‐(1 H‐异色素n ‐1‐基)‐1 H‐吲哚,可通过提纯将其转变为5 H‐苯并[ b ]咔唑-6‐基酮温度(请参阅方案)。这些酮表现出强烈的荧光并与金属离子相互作用以增强荧光强度。
Synthesis of the dibenzo[<i>b</i>,<i>d</i>]azepine skeleton <i>via</i> a catalyst-free ring expansion domino reaction
In this article, a hitherto unreported catalyst-free ringexpansionreaction of tetrahydroisoquinolines with o-alkynylarylaldehydes for the construction of the dibenzo[b,d]azepine skeleton is described. Using air as a “green” oxidant, some important biologically active dibenzo[b,d]azepines were produced with favorable functional group tolerance and a wide substrate scope. The synthetic potential was
在本文中,描述了迄今为止未报道的四氢异喹啉与邻炔基芳醛的无催化剂扩环反应,用于构建二苯并[ b , d ]氮杂骨架。利用空气作为“绿色”氧化剂,制备了一些具有良好的官能团耐受性和广泛的底物范围的重要生物活性二苯并[ b , d ]氮杂卓类化合物。通过简单的放大反应和异吲哚啉衍生物的合成进一步证实了合成潜力。
Silver(I)-Catalyzed Addition-Cyclization of Alkyne-Functionalized Azomethines
作者:Yuchen Liu、Wencui Zhen、Wei Dai、Fen Wang、Xingwei Li
DOI:10.1021/ol4000108
日期:2013.2.15
AgOTf can catalyze an addition-cyclization tandem between alkyne-azomethine and a nucleophile such as ketone, nitroalkane, water, and terminal alkyne to give a polycyclic amide via six-exo-trig selectivity.