A modular 2H-azirine synthesis from ketoximeacetates via Cs2CO3-mediated cyclization has been developed. The reaction utilizes easily available starting materials and provides a general synthetic route to 2,3-diaryl-2H-azirines in good to excellent yields under mild conditions, which is complementary to the conventional approaches for the synthesis of 2H-azirines. A gram-scale reaction was performed
已经开发了由乙酸酮肟通过Cs 2 CO 3介导的环化合成的模块化2 H-叠氮基。该反应利用容易获得的原料,并在温和条件下以良好至优异的产率提供了合成2,3-二芳基-2 H-叠氮基的一般合成路线,这是合成2 H-叠氮基的常规方法的补充。进行了克级反应以证明该合成方法的放大适用性。重要的是,2 H-叠氮基可以有效地转化为各种氮杂杂环。
Synthesis of some tetrahydronaphthyl- and flavanyl-coumarins
作者:Roy S. Shadbolt、David R. Woodward、Peter J. Birchwood
DOI:10.1039/p19760001190
日期:——
The synthesis is described of a number of 3-[3-(p-substituted phenyl)-1,2,3,4-tetrahydro-1-naphthyl]-4-hydroxycoumarins (7) and 3-(4′-substituted flavan-4-yl)-4-hydroxycoumarins (17), many of which show outstanding activity as anticoagulants against both Warfarin-resistant rats. The final stage in the syntheses involves the reaction of either 3-(p-substituted phenyl)-1,2,3,4-tetrahydro-1-naphthols
Nickel-catalyzed cross-coupling of epoxides with aryltriflates: rapid and regioselective construction of aryl ketones
作者:Jinglin Qu、Zijuan Yan、Xuchao Wang、Jun Deng、Feipeng Liu、Zi-Qiang Rong
DOI:10.1039/d2cc02891c
日期:——
biologically active molecules and functional materials. Presented herein is a facile synthetic method for the construction of ketones via Ni-catalyzed cross coupling of epoxides with aryltriflates. A range of easily accessible epoxides can be highly regioselectively converted to the corresponding aryl ketones with good yields in a redox neutral fashion.
An Accesss to 4,5,6-Trisubstituted Pyrimidines from 2<i>H</i>-Azirines and α-Isocyanoacetates or α-Isocyanoacetamides Enabled by 1,3-Dipolar [3 + 2] Cycloaddition/Ring-Expanding/Oxidative Aromatization Process
作者:Haoxiang Zhang、Mengfan Li、Kunpeng Wang、Yan Chen、Benren Liao、Qingwei Wang、Weiyin Yi
DOI:10.1021/acs.joc.3c02378
日期:2024.2.2
date, the strategies to generate 4,5,6-trisubstituted pyrimidines were not reported. Here, a copper-catalyzed reaction of 2H-azirines with α-isocyanoacetates or α-isocyanoacetamides has been developed, rapidly preparing 4,5,6-trisubstituted pyrimidines. The mechanistic results reveal that this strategy underwent a formal 1, 3-dipolar [3 + 2] cycloaddition/ring-expanding/oxidativearomatization procedure