从3-氨基-2-喹喔啉腈1,4-二氧化物1开始,通过化学修饰2-氰基和3-氨基制备了一系列新的喹喔啉衍生物。硝化3-氨基-2-喹喔啉腈3,得到7-硝基衍生物6。3的重氮化得到3-氯化合物9。从9获得2,3-喹喔啉二甲腈14。吡啶并[4,5- b ]喹喔啉15和16是通过将14与水合肼缩合而制备的。三唑并[4,5- b ]喹喔啉18,鉴定出异噻唑并[4,5- b ]喹喔啉20和两个吡唑并[3,4- b ]喹喔啉21和22。测试了化合物在有氧和低氧细胞中的细胞毒性作用。
convenient and efficient route for the chemoselective synthesis of carbohydrazide, arenesulfonylhydrazide, and thiosemicarbazone derivatives of 5H-pyrrolo[3,4-b]pyrazine and 1H-pyrrolo[3,4-b]quinoxaline from the corresponding dinitriles and substituted hydrazines was elaborated. The synthesis of starting pyrazine-2,3-dicarbonitrile was sufficiently improved by using concentrated HCl as a catalyst. A convenient
摘要 从相应的二腈和取代的肼类化合物化学选择性合成5 H-吡咯并[3,4- b ]吡嗪和1 H-吡咯并[3,4- b ]喹喔啉的碳酰肼,芳烃磺酰肼和硫代半脲衍生物的便捷有效途径被详细阐述。通过使用浓HCl作为催化剂,起始吡嗪-2,3-二腈的合成得到了充分改善。 从相应的二腈和取代的肼类化合物化学选择性合成5 H-吡咯并[3,4- b ]吡嗪和1 H-吡咯并[3,4- b ]喹喔啉的碳酰肼,芳烃磺酰肼和硫代半脲衍生物的便捷有效途径被详细阐述。通过使用浓HCl作为催化剂,起始吡嗪-2,3-二腈的合成得到了充分改善。
Quinoxalines. XXVII. The cyanation of 2-substituted quinoxaline 4-oxides with trimethylsilyl cyanide.
作者:Chihoko IIJIMA、Akira MIYASHITA
DOI:10.1248/cpb.38.661
日期:——
The deoxy-cyanation of 2-substituted quinoxaline 4-oxides (Ia-k) with trimethylsilyl cyanide in the presence of 1, 8-diazabicyclo[5.4.0]undec-7-ene gave the corresponding 3-substituted 2-quinoxalinecarbonitriles (IIa-k). However, in the case of 2-(p-tolylsulfonyl)quinoxaline 4-oxide (II), the substitution with cyanide ion proceeded together with deoxy-cyanation to give 2, 3-quinoxalinedicarbonitrile (III).
Heterocyclic Colorants Based on Diazabenzoisoindoles
申请人:Heckmann Heino
公开号:US20070264600A1
公开(公告)日:2007-11-15
The invention is directed to novel colorants of formula (I), wherein A represents a group of general formulas (II), (III), (IV) or (V), and B represents a substituted or unsubstituted ortho-C6-C18 arylene, wherein C and D represent an alicyclic or heteroyclic group.
Phthalonitrile undergoes partial hydration in MeOH–H2O media in the presence of an equimolar amount of NaOH to afford 2-carbamimidoylbenzoic acid in good yield in one step. This and similar vic-amidino (hetero)aromatic acids also could be synthesized from corresponding 1,2-dinitriles by hydrolysis in aqueous MeOH catalyzed by an equimolar amount of NaOH of in situ generated 1,1-dimethoxy-1H-isoindol-3-amine
Porphyrin and subphthalocyaninatoboron(III) chromophores have been fused through quinoxaline moiety, resulting in the first porphyrin-subphthalocyaninatoboron(III)-fused hybrid with intramolecular charge transfer from tetrapyrrole/tripyrrole chromophores to the quinoxaline moiety. The unique plane-bowl...