Synthesis of spiroindolenine-3,3′-pyrrolo[2,1-b]quinazolinones through gold(i)-catalyzed dearomative cyclization of N-alkynyl quinazolinone-tethered indoles
One-Pot, Two-Step Cascade Synthesis of Quinazolinotriazolobenzodiazepines
摘要:
An operationally simple, one-pot, two-step cascade method has been developed to afford quinazolino[1,2,3]triazolo[1,4]benzodiazepines. This unique, atom-economical transformation engages five reactive centers (amide, aniline, carbonyl, azide, and alkyne) and employs environmentally benign iodine as a catalyst. The method proceeds via sequential quinazolinone-forming condensation and intramolecular azide-alkyne 1,3-dipolar cycloaddition reactions. Substrate scope, multicomponent examples, and mechanistic insights are discussed.
Gold(I)‐Catalyzed Selective Cyclization and 1,2‐Shift to Prepare Pseudorutaecarpine Derivatives
作者:Wang Wang、Nan‐Ying Chen、Pei‐Sen Zou、Li Pang、Dong‐Liang Mo、Cheng‐Xue Pan、Gui‐Fa Su
DOI:10.1002/adsc.202101054
日期:2022.2.15
pseudorutaecarpine derivatives were prepared in good to excellent yields through a gold(I)-catalyzed selective cyclization and 1,2-shift of N-alkynyl quinazolinone-tethered indoles. Mechanistic study revealed that spiroindolenines generated in situ by cyclization at the the indole C3 position underwent an alkenyl 1,2-shift to generate pseudorutaecarpine. The reaction proceeds under mild reaction conditions
Synthesis of 4-(trichloromethyl)pyrido[2′,1′:3,4]pyrazino[2,1-<i>b</i>]quinazolinones through a cyclized dearomatization and trichloromethylation cascade strategy
作者:Xu Zhang、Meng-Yan Wei、Jun-Cheng Su、Cui Liang、Cheng-Xue Pan、Gui-Fa Su、Dong-Liang Mo
DOI:10.1039/d3ob02084c
日期:——
A variety of 4-(trichloromethyl)pyrido[2′,1′:3,4]pyrazino[2,1-b]quinazolinones were prepared in moderate to good yields with high regioselectivity through intramolecular 6-endo-dig cyclization and trichloromethylation of N3-alkynyl-2-pyridinyl-tethered quinazolinones in chloroform. Mechanistic studies revealed that chloroform might serve as a trichloromethyl anion precursor. Furthermore, the reaction
通过分子内6-内环化和三氯甲基化,以中等至良好的产率和高区域选择性制备了多种4-(三氯甲基)吡啶并[2',1':3,4]吡嗪并[2,1- b ]喹唑啉酮。 N 3-炔基-2-吡啶基束缚的喹唑啉酮在氯仿中。机理研究表明,氯仿可能作为三氯甲基阴离子前体。此外,该反应可以很容易地在克级进行,并且通过五个步骤制备了雌酮衍生的4-(三氯甲基)吡啶并[2',1':3,4]吡嗪并[2,1- b ]喹唑啉酮。该方法具有底物范围广、官能团耐受性好、吡啶环脱芳构化新、三氯甲基化试剂为氯仿等特点。