Synthesis of Benzofurans from Ketones and 1,4-Benzoquinones
作者:Fengtian Wu、Rongxian Bai、Yanlong Gu
DOI:10.1002/adsc.201600048
日期:2016.7.14
Benzofuran derivatives can be synthesized through the sequential Michael addition and cyclization of 1,3‐dicarbonyl compounds with 1,4‐benzoquinones. However, ketones are rarely used in this reaction because of their low nucleophilicities. In this study, this problem was solved by utilizing triethyl orthoformate, which enabled the formation of a vinyl ethyl ether as an additive. As a result, the nucleophilicity
In the presence of a catalytic amount of trityl perchlorate, 1,4-benzoquinone, quinonemonoimides, or imidoquinones react with silyl enol ethers to produce the corresponding benzofuran or indole derivatives in high yields via the corresponding Michael adducts.
Synthesis of 2,3-Dialkyl-5-hydroxybenzofurans via a One-pot, Three-step Reaction Sequence of 2-Monosubstituted 1,3-Diketones and 1,4-Benzoquinones
作者:Qing Dong、Yu-Huan Yang、Xue-Jiao Lv、Jia-Hui Liu、Yan-Kai Liu
DOI:10.1021/acs.joc.4c00511
日期:2024.5.17
An economical one-pot, three-step reaction sequence of readily available 2-monosubstituted 1,3-diketones and 1,4-benzoquinones has been explored for the facile access of 2,3-dialkyl-5-hydroxybenzofurans. By using cheap K2CO3 and conc. HCl as the reaction promoters, the reaction occurs smoothly via sequential Michael addition, aromatization, retro-Claisen, deacylation, hemiketalization, and dehydration
为了方便地获得 2,3-二烷基-5-羟基苯并呋喃,我们探索了一种经济的一锅三步反应序列,由容易获得的 2-单取代 1,3-二酮和 1,4-苯醌组成。通过使用廉价的 K 2 CO 3和浓缩物。以HCl为反应促进剂,通过连续的迈克尔加成、芳构化、逆克莱森、脱酰化、半缩酮化和脱水等过程,反应在温和条件下顺利进行,实用性强。此外,在衍生化研究过程中观察到一个有趣的现象,其中二氢喹啉通过歧化过程分别转化为四氢喹啉和喹啉产物。
MUKOYAMA, MITSUAKI;SAGAVA, MASAXIRO
作者:MUKOYAMA, MITSUAKI、SAGAVA, MASAXIRO
DOI:——
日期:——
MUKAIYAMA, TERUAKI;SAGAWA, YUKIHIRO;KOBAYASHI, SHU, CHEM. LETT.,(1987) N 11, 2169-2172
作者:MUKAIYAMA, TERUAKI、SAGAWA, YUKIHIRO、KOBAYASHI, SHU