One-Pot Synthesis of Pyrrolo[2,1-α]isoquinolines via Tandem Reactions of Vinylselenonium Salt, 2-Bromoethanones, and Isoquinoline
作者:E Tang、Deshou Mao、Qi Sun、Minghong Liao、Yunxia Li、Shanshan Liu
DOI:10.3987/com-19-14162
日期:——
3-unsubstituted pyrrolo[2,1-a]isoquinolines efficiently. Herein, we report a tandem reaction of the methyl(phenyl)vinylselenonium salt with isoquinoline and 2-bromoethanones to access 2,3-unsubstituted pyrrolo[2,1-α]isoquinolines efficiently and conveniently under mild conditions and in moderate to good yields. To the best of our knowledge, this is the first reported one-pot synthesis of the pyrrolo[2,1-a]isoquinolines
regioselectively synthesized by a convenient one pot reaction of the corresponding pyridinium (quinolinium, isoquinolinium) ylide with maleic anhydride (MA) in the presence of the mild oxidant tetrakispyridinecobalt(II) dichromate (TPCD). These reactions proceed via a tandem reaction sequence of 1,3-dipolar cycloaddition of azomethine ylide with MA, anhydride hydrolysis and oxidative bisdecarboxylation
3-Acylindolizines(5a-5f)和它们的苯并类似物1-acylpyrrolo [1,2- a ] quinolines(6a - 6f)和1-acylpyrrolo [2,1- a ] isoquinolines (7a-7i)是通过区域选择性合成的相应的吡啶鎓(喹啉鎓,异喹啉鎓)内酯与马来酸酐 (嘛)在弱氧化剂存在下 四铬吡啶钴(II)重铬酸盐 (TPCD)。这些反应通过偶氮甲meth内酯与1,3,3-偶极环加成的串联反应序列进行嘛, 酐 水解和一级环加合物的氧化双脱羧,然后将二氢吲哚并咪唑脱氢芳构化。 TPCD在反应中同时用作脱羧剂和脱氢剂。这些结果表明TPCD 是用于脂肪族羧酸酯双脱羧的有前途的新试剂。
Generation of pyrrolo[2,1-a]isoquinoline derivatives from N-ylides: Synthetic control and structural characterization
作者:Florea Dumitrascu、Mino R. Caira、Emilian Georgescu、Florentina Georgescu、Constantin Draghici、Marcel Mirel Popa
DOI:10.1002/hc.20740
日期:2011.11
New pyrrolo[2,1-a]isoquinolines were obtained by two one-pot procedures via 1,3-dipolar cycloaddition between the isoquinolinium N-ylides and symmetrical acetylenic dipolarophiles, avoiding the formation of dihydro intermediates. For structural comparison, the dihydro derivatives obtained by a classical two-stage reaction were characterized by NMR and X-ray crystallography, allowing complete stereochemistry
A formal [3 + 2] annulation reaction of propargyl sulfonium compounds and <i>N</i>-ylides: access to pyrrolo[2,1-<i>a</i>]quinolines, pyrrolo[2,1-<i>a</i>]phthalazines and indolizines
作者:Jing Zheng、Xiaojie He、Hong Xu、Hua Liu、Weiran Yang
DOI:10.1039/d0ob01739f
日期:——
A sequential [3 + 2] annulation of prop-2-ynylsulfonium salt and N-ylides was developed, leading to the formation of a series of pyrrolo[2,1-a]quinolines, pyrrolo[2,1-a]phthalazines and indolizines. The protocol featured the simultaneous one-pot formation of three new C–C bonds in moderate yields under mild conditions. In this reaction, the prop-2-ynylsulfonium salts acted as the C2 synthons and sulfide
开发了丙-2-炔基锍盐和N-叶立德的顺序[3 + 2]环化,导致形成一系列吡咯并[2,1 - a ]喹啉、吡咯并[2,1 - a ]酞嗪和中氮茚。该协议的特点是在温和条件下以中等收益率同时一锅形成三个新的 C-C 键。在该反应中,prop-2-ynyl 锍盐充当 C2 合成子,硫化物充当离去基团。所得产物可作为合成多种化合物的有用前体。
Discovery of Oxygen Induced Chemoselectivity in Pd-Catalyzed C–H Functionalization: Cross-Dehydrogenative Coupling vs C–H Amination
作者:Sheba Ann Babu、Sunil Varughese、Jomon Mathew、Jubi John
DOI:10.1021/acs.joc.3c00651
日期:2023.7.21
A Pd-catalyzed cross-dehydrogenative coupling of 5-benzoyl-pyrrolo[2,1-a]isoquinoline afforded 8H-indeno-pyrrolo[2,1-a]isoquinolinone and an oxygen induced palladium catalyzed selective C–H amination in the same substrate provided a pentacene viz., 9H-indolo-pyrrolo[2,1-a]isoquinoline. We also observed the formation of a multiring fused benzazepine scaffold by the site selective C–H amination in 5-(4-nitro
我们发现了一种底物,即 5-苯甲酰基-吡咯并[2,1- a ]异喹啉,其中鉴定出三个不同的可官能化 C-H 键,可以明智地选择性地进行位点转化,以生成复杂的多环稠合N-杂环。钯催化的 5-苯甲酰基-吡咯并[2,1- a ]异喹啉的交叉脱氢偶联得到 8 H-茚并-吡咯并[2,1- a ]异喹啉酮,并在氧诱导的钯催化下选择性 C-H 胺化。相同的底物提供并五苯,即9 H-吲哚并吡咯并[2,1- a ]异喹啉。我们还观察到通过位点选择性 C-H 胺化在 5-(4-硝基苯甲酰基)-吡咯并[2,1- a ]异喹啉中形成多环稠合苯并氮杂支架。