共查询到17条相似文献,搜索用时 46 毫秒
1.
2.
发展了一种苯甲酰胺自由基自由基环化制备α-官能化叔烷基取代的异喹啉二酮的新反应。此环化反应以偶氮试剂为α-取代叔烷基自由基源物质,利用碘化亚铜/空气体系催化N-烷基-N-甲基丙烯酰基苯甲酰胺发生环化,经过串联自由基加成/环化/碳-碳键形成过程,一步构建了三重碳-碳键,以41%~71%的产率合成了一系列异喹啉二酮及其衍生物。特别值得提出得是,此研究发展了一种新型α-官能叔烷基自由基源物质,发现了一种同时引入两个α-官能叔烷基片段的串联新反应。反应底物适应范围广,反应高效,催化体系廉价实用,为具有潜在药用价值的含α-取代季碳中心的异喹啉二酮及衍生物的合成提供了一条廉价、简单、快捷的新途径。 相似文献
3.
4.
5.
6.
7.
8.
9.
介孔分子筛MCM-41 依次与3-氯丙基三乙氧基硅烷、环己二胺和三唑醛反应, 得到席夫碱修饰的新型介孔分子筛MCM-41 催化剂. 通过傅里叶变换红外光谱(FTIR)和X 射线多晶衍射(XRD)等方法对所得催化剂进行表征. 以过氧化氢为氧源, 介孔分子筛MCM-41 负载的席夫碱为催化剂, 研究了α,β-不饱和酮的环氧化反应, 考察了金属盐、溶剂、催化剂用量、反应时间等因素对环氧化反应的影响. 结果表明, 在室温下乙腈溶剂中, α,β-不饱和酮的环氧化反应在短时间内均以很高的产率(高达99%)得到了相应的产物. 同时, 对催化剂的重复利用进行了研究, 发现重复使用四次, 仍能以较高产率得到环氧化产物. 相似文献
10.
11.
Carbonyl-containing oxindoles are ubiquitous core structures present in many biologically active natural products and pharmaceutical molecules. Nickel-catalyzed reductive aryl-acylation of alkenes using aryl anhydrides or alkanoyl chlorides as acyl sources is developed, providing 3,3-disubstituted oxindoles bearing ketone functionality at the 3-position. Moreover, nickel-catalyzed reductive aryl-esterification of alkenes using chloroformate as ester sources is further developed, affording 3,3-disubstituted oxindoles bearing ester functionality at the 3-position. This strategy has the advantages of good yields and high functional group compatibility. 相似文献
12.
13.
Fangwei Ding Yuanding Fang Yanqiu Jiang Prof. Dr. Kaifeng Lin Prof. Lei Shi 《化学:亚洲杂志》2018,13(6):636-640
Cu‐catalyzed direct difluoromethylation of activated alkenes through a difluoromethyl radical addition/cyclization to afford difluorinated oxindoles and quinoline‐2,4‐diones has been developed. This method provides convenient access to a variety of oxindoles and quinoline‐2,4‐diones under mild conditions via a proposed tandem radical cyclization process, while tolerating various functional groups well. Moreover, a facile method to construct diverse difluorinated quinoline‐2,4‐diones by visible‐light photoredox catalysis under mild conditions was presented. 相似文献
14.
Dr. Yao Wang Dipl.‐Chem. Jonathan O. Bauer Prof. Dr. Carsten Strohmann Dr. Kamal Kumar 《Angewandte Chemie (International ed. in English)》2014,53(29):7514-7518
Catalytic, selective, and controlled oxidative functionalization of C? H bonds using molecular oxygen as an oxidant remains highly desirable and equally challenging in the development of synthetic methodologies. Presented herein is a one‐pot oxygenase cascade reaction wherein a copper(I)‐catalyzed oxygenase reaction transforms the allylic methyl group in 3‐methylidene oxindoles into an aldehyde, which then undergoes an aldol–oxa‐Michael addition sequence with β‐ketoesters to yield dihydrofuran‐bearing oxindoles. 相似文献
15.
16.
A Direct CH/ArH Coupling Approach to Oxindoles,Thio‐oxindoles, 3,4‐Dihydro‐1 H‐quinolin‐2‐ones,and 1,2,3,4‐Tetrahydroquinolines 下载免费PDF全文
Dr. Timothy E. Hurst Ryan M. Gorman Pauline Drouhin Dr. Alexis Perry Prof. Richard J. K. Taylor 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(43):14063-14073
A copper(II)‐catalysed approach to oxindoles, thio‐oxindoles, 3,4‐dihydro‐1H‐quinolin‐2‐ones, and 1,2,3,4‐tetrahydroquinolines via formal C?H, Ar?H coupling is described. In a new variant, copper(II) 2‐ethylhexanoate has been identified as an inexpensive and efficient catalyst for this transformation, which utilises atmospheric oxygen as the re‐oxidant. 相似文献