Synthesis and anticonvulsant activities of functionalized 5-(isoindole-1,3-dione)-pyrimidinones
作者:Rashmi Sharma、Dinesh Y. Gawande、Chander Mohan、Rajesh Kumar Goel
DOI:10.1007/s00044-016-1580-4
日期:2016.7
present work involves the synthesis of previously unknown 5-(isoindole-1,3-dione) pyrimidinones by [4 + 2] cycloaddition reactions of functionalized 1,3-diazabuta-1,3-dienes with phthalimidoketene, generated in situ from phthaloylglycine, tosyl chloride, and triethylamine. The 5-(isoindole-1,3-dione)-pyrimidinones have been screened in vivo for their anticonvulsantactivities using MES and PTZ methods
Green fluorescent aggregates of diphenylpyrimidinone–salicylideneamine show AIE + ESIPT in 99% H2O:CH3CN for the visualization of fingerprints on aluminium, steel, glass, ceramic tile and metal coin surfaces.
Synthesis of functionalised cyclic nitrones via regioselective and unusual [3 + 2] cycloadditions of α-nitrosostyrenes with 1,3-diazabuta-1,3-dienes and imines
作者:Arun K. Sharma、Sujit N. Mazumdar、Mohinder P. Mahajan
DOI:10.1039/a702254i
日期:——
The α-nitrosostyrenes 2, generated in situ from α-halogeno oximes, undergo regioselective [3 + 2] cycloaddition with 1,3-diazabuta-1,3-dienes 1 and 5 leading to the cyclic nitrones 3 and 6, respectively. Similarly, the cyclic nitrones 12 are also formed in reactions of 2 with the trisubstituted amidines 11. Thermolysis of the nitrones 3 and 12dâf gives imidazole derivatives 13. The nitrones 6, on the other hand, on thermolysis under similar conditions, give the amidine derivatives 17. Interestingly, the treatment of both 3 and 6 with NaBH4 in methanol and the reactions of 2 with N-arylbenzamidines also yield the imidazole derivatives 13.
A Facile and Chemoselective Synthesis of Novel Pyrimido[5,4‐
<i>b</i>
][1,4]thiazines by
<i>exo</i>
‐dig Iodocyclization Reactions
作者:Rashmi Sharma、Chander Mohan
DOI:10.1002/jhet.2773
日期:2017.5
The present manuscript involves the synthesis of 5‐prop‐2‐ynylsulfanyl‐pyrimidin‐4‐ones 3a–i by [4 + 2] cycloaddition reactions of 1,3‐diazabuta‐1,3‐dienes 1a–i with prop‐2‐ynyl‐sulfanyl ketene 2. These 5‐prop‐2‐ynylsulfanyl‐pyrimidin‐4‐ones 3a–i were explored in iodocyclization for the synthesis of novel pyrimido[5,4‐b][1,4]thiazines 4a–i in excellent yields. The iodocyclizations followed exo‐dig
本手稿涉及通过1,4-二氮杂丁烯-1,3-二烯1a-i与prop-2的[4 + 2]环加成反应合成5-prop-2-炔基硫基嘧啶-4-ones 3a-i。炔基-硫烷基烯酮2。在碘环化中探索了这些5-丙-2-炔基硫基嘧啶-4-酮3a-i,以优异的产率合成新型嘧啶并[5,4- b ] [1,4]噻嗪4a-i。所述iodocyclizations随后的外切挖闭环环化,得到6-6双环稠合的嘧啶酮,而对应内切-Dig闭环iodoamination未观察到。
Synthesis of Functionally Substituted 1,3-Diaza-1,3-butadienes
作者:S. N. Mazumdar、M. P. Mahajan
DOI:10.1055/s-1990-26892
日期:——
Three methods for the synthesis of various stable 1,3-diaza-1,3-butadienes from easily available thiourea derivatives are reported.