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
Silver-Promoted (4 + 1) Annulation of Isocyanoacetates with Alkylpyridinium Salts: Divergent Regioselective Synthesis of 1,2-Disubstituted Indolizines
作者:Yan Chen、Andrey Shatskiy、Jian-Quan Liu、Markus D. Kärkäs、Xiang-Shan Wang
DOI:10.1021/acs.orglett.1c02754
日期:2021.10.1
regioselective (4 + 1) annulation of isocyanoacetates with pyridinium salts is reported. The established protocol provides controlled, facile, and modular access to a range of synthetically useful N-fused heterocyclic scaffolds containing indolizines, pyrrolo[1,2-a]quinolines, pyrrolo[2,1-a]isoquinolines, and 1H-imidazo[4,5-a]indolizin-2(3H)-ones. A mechanistic pathway involving nucleophilic addition/protonati
报道了一种前所未有的银促进的区域选择性 (4 + 1) 异氰乙酸酯与吡啶盐的环化。已建立的协议提供对一系列合成有用的 N-稠合杂环支架的受控、简便和模块化访问,这些支架包含吲哚嗪、吡咯并 [1,2- a ] 喹啉、吡咯并 [2,1- a ] 异喹啉和 1 H -咪唑[4,5 - a ]indolizin-2(3 H )-ones。提出了涉及亲核加成/质子化/消除/环异构化的机制途径。
Regioselective synthesis of 3-acylindolizines and benzo- analogues via 1,3-dipolar cycloadditions of N-ylides with maleic anhydride
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。