Synthesis of New Benzo-substituted Macrocyclic Ligands Containing Quinoxaline Subunits
作者:Ahmed H.M. Elwahy
DOI:10.1016/s0040-4020(99)01072-8
日期:2000.2
The macrocyclic Schiff bases 20–25 were prepared by cyclocondensation of the bis aldehydes 12–15 with the appropriate diaminoalkanes 17–19. Reduction of the latter with NaBH4 afforded the corresponding azacrown ethers 27–30. Heating of the aldehydes 12–16 in refluxing acetic acid afforded the corresponding 2,3-bis(benzofuranyl)quinoxalines 33–37. Nucleophilic reaction of the bis phenols 45–48, 54,
Studies in the heterocyclic series. XX. 1,4-Diazaphenoxazine and related compounds
作者:Charles O. Okafor
DOI:10.1002/jhet.5570180732
日期:1981.11
As part of our program on the synthesis of new psychotropic agents, the parent rings of two diazaphenox-azines are described. The reaction of 2-aminophenol and 2,3-dichloropyrazine in alkaline media gave good yields of 1,4-diazaphenoxazine. Replacement of 2,3-dichloropyrazine with 2,3-dichloroquinoxaline gave on the other hand the heterocycle, 1,4-diazabenzo[b]phenoxazine. Nitration and S-oxide formation
作为我们合成新精神药物的计划的一部分,描述了两种二氮杂苯并恶嗪的母环。2-氨基苯酚和2,3-二氯吡嗪在碱性介质中的反应产生了良好的1,4-二氮杂吩恶嗪产率。另一方面,用2,3-二氯喹喔啉代替2,3-二氯吡嗪得到杂环1,4-二氮苯并[ b ]吩恶嗪。通过与混合的硝酸和硫酸反应可实现硝化和S-氧化物的形成。还讨论了这些化合物的机理途径。
Visible-Light Organophotoredox-Mediated [3 + 2] Cycloaddition of Arylcyclopropylamine with Structurally Diverse Olefins for the Construction of Cyclopentylamines and Spiro[4.<i>n</i>] Skeletons
作者:Zhengshan Luo、Bowen Cao、Tianhang Song、Zequn Xing、Jun Ren、Zhongwen Wang
DOI:10.1021/acs.joc.2c02061
日期:2022.11.18
We developed a visible-light-mediated [3 + 2] cycloaddition of arylcyclopropylamine with structurally diverse olefins using QXPT-NPh as a highly efficient organic photoredox catalyst. We first achieved the use of various alkyl-substituted alkenes in intermolecular [3 + 2] cycloadditions with cyclopropylamine. We also developed a general and efficient strategy for the construction of structurally diverse