摘要 通过柳氮磺吡啶铁与作为磁性生物聚合物表面的纳米材料CoFe 2 O 4 -纤维素反应,制备了绿色纳米催化剂。这种新型非均相有机金属催化剂通过 X 射线衍射、场发射扫描电子显微镜、FT-IR 光谱、热重分析和 X 射线能量色散分析以及电感耦合等离子体质谱法进行了表征。这种负载在 CoFe 2 O 4 纤维素上的绿色柳氮磺吡啶药物复合物被用作有机反应的有效且可回收的催化剂,例如功能化 4H-吡喃和 1,4-二氢吡啶衍生物的合成。所有的反应都在温和的条件下在很短的反应时间内成功进行。使用过的催化剂很容易分离并重复使用 6 次,而其催化活性没有明显损失。图形摘要
Efficient Three-Component One-Pot Synthesis of 4H-Pyrans
作者:J. Malviya、S. Kala、L. K. Sharma、R. K. P. Singh
DOI:10.1134/s1070428019050178
日期:2019.5
Clean, practical, and efficient electrochemical synthesis of pharmaceutically relevant 4H-pyran derivatives by one-pot three-component combination of an aryl aldehyde, malononitrile, and a dicarbonyl compoundis developed. The synthesis is performed in ethanol with lithium perchlorate as a supporting electrolyte in an undivided cell on a platinum electrode under constant potential electrolysis conditions.
Ferric Sulfasalazine Sulfa Drug Complex Supported on Cobalt Ferrite Cellulose; Evaluation of Its Activity in MCRs
spectrometry. This green sulfasalazine drug complex supported on CoFe 2 O 4 cellulose was applied as an efficient and recyclable catalyst for organic reactions such as synthesis of functionalized 4H- pyrans and 1,4-dihydropyridines derivatives. All of the reactions were carried out successfully under mild conditions in a short reaction time. The usedcatalyst was easily separated and reused for 6 runs without
摘要 通过柳氮磺吡啶铁与作为磁性生物聚合物表面的纳米材料CoFe 2 O 4 -纤维素反应,制备了绿色纳米催化剂。这种新型非均相有机金属催化剂通过 X 射线衍射、场发射扫描电子显微镜、FT-IR 光谱、热重分析和 X 射线能量色散分析以及电感耦合等离子体质谱法进行了表征。这种负载在 CoFe 2 O 4 纤维素上的绿色柳氮磺吡啶药物复合物被用作有机反应的有效且可回收的催化剂,例如功能化 4H-吡喃和 1,4-二氢吡啶衍生物的合成。所有的反应都在温和的条件下在很短的反应时间内成功进行。使用过的催化剂很容易分离并重复使用 6 次,而其催化活性没有明显损失。图形摘要
Convenient selective synthesis of pyrano[2,3-d]pyrimidines
作者:Yu. M. Litvinov、A. M. Shestopalov
DOI:10.1007/s11172-008-0308-0
日期:2008.10
A selective method for the synthesis of substituted and annulated pyrano[2,3-d]pyrimidines consisting in acylation of 2-amino-3-cyano-4H-pyrans with acetic anhydride has been developed. It was shown for the first time that acid catalysis is more efficient in this reaction, rather than base catalysis as it has been believed earlier.