Synthesis of Furo[3,2-<i>b</i>]quinolines and Furo[2,3-<i>b</i>:4,5-<i>b′</i>]diquinolines through [4 + 2] Cycloaddition of Aza-<i>o</i>-Quinone Methides and Furans
作者:Lu Lei、Yi-Yun Yao、Li-Juan Jiang、Xiuqiang Lu、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.joc.9b02953
日期:2020.3.6
An approach for the construction of furo[3,2-b]quinolines and furo[2,3-b:4,5-b']diquinolines is developed through a metal-free [4 + 2] cycloaddition of easily available in situ generated aza-o-quinone methides and furans. The reaction tolerates a wide range of aza-o-quinone methides and substituted furans to afford the corresponding dihydro- or tetrahydrofuroquinolines in good to excellent yields.
Rhodium(III)‐Catalyzed C−H Benzylation of Indole's C3 Position with Aza‐
<i>o</i>
‐Quinone Methides
作者:Ruixing Liu、Yin Wei、Min Shi
DOI:10.1002/adsc.202000613
日期:2020.9.8
activation relay using aza‐o‐QM as a functionalization reagent, affording the desired products in good yields under mild conditions. The plausible reaction mechanism is proposed on the basis of control and deuteriumlabeling experiments and the further transformation has been also described.
Diversity-oriented synthesis of 1,2,3,5-tetrahydrobenzo[e][1,2,4]oxadiazepines and 2,3-dihydro-1H-benzo[e][1,2,4]triazepines by base-induced [4 + 3] annulation reactions
作者:Wuyan Long、Shuangqun Chen、Xiaohong Zhang、Ling Fang、Zhiyong Wang
DOI:10.1016/j.tet.2018.09.004
日期:2018.10
The base-induced formal [4 + 3] annulation reactions of N-(ortho-chloromethyl)aryl amides with nitrones or hydrazonoyl chlorides have been reported. When nitrones are used as the 1,3-dipole, the corresponding reaction afforded a series of 1,2,3,5-tetrahydrobenzo[e][1,2,4]oxadiazepine derivatives. Highly functionalized 2,3-dihydro-1H-benzo[e][1,2,4]triazepine derivatives were also synthesized via an
已经报道了碱诱导的N-(邻氯甲基)芳基酰胺与硝酮或酰肼基氯化物的正式[4 + 3]环化反应。当将硝酮用作1,3-偶极时,相应的反应得到一系列1,2,3,5-四氢苯并[ e ] [1,2,4]恶二氮杂衍生物。还通过N-(邻-氯甲基)芳基酰胺和酰基之间空前的串联氮杂-迈克尔加成/重排芳构化反应合成了高度官能化的2,3-二氢-1 H-苯并[ e ] [1,2,4]三氮杂卓衍生物氯化物。
Construction of Optically Active Indolines by Formal [4+1] Annulation of Sulfur Ylides and<i>N</i>-(<i>ortho</i>-Chloromethyl)aryl Amides
Get asymmetric! Asymmetric [4+1] annulation of sulfur ylides and N‐(ortho‐chloromethyl)arylamides allowed the formation of the desired cycloadduct with moderate to high yields and enantioselectivities (see scheme). The described strategy, taking advantage of chiral sulfur ylides, represents a direct procedure to access chiral 2‐substituted indolines.
Herein, we described a copper(I)-catalyzed dearomatization of benzofurans with 2-(chloromethyl)anilines to prepare various tetrahydrobenzofuro[3,2-b]quinolines and 2-(quinolin-2-yl)phenols in good to excellent yields through radical addition and an intramolecular cyclization process. Mechanistic studies revealed that 2-(chloromethyl)anilines served as radical precursors. The present method features
在此,我们描述了铜(I)催化苯并呋喃与2-(氯甲基)苯胺的脱芳构化反应,以良好至优异的产率制备各种四氢苯并呋喃并[3,2- b ]喹啉和2-(喹啉-2-基)苯酚自由基加成和分子内环化过程。机理研究表明,2-(氯甲基)苯胺是自由基前体。该方法具有底物范围广、官能团耐受性好、喹啉支架多样性以及苯并呋喃自由基加成脱芳构化等特点。