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
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。
Highly regioselective 6-<i>exo-dig</i> iodo/bromo cyclizations of functionalized 5-amino propargyl pyrimidinones: an efficient synthesis of functionalized pteridines
作者:Rayees Ahmad Naikoo、Rupesh Kumar、Rashmi Sharma、Dinesh Mahajan、Gaurav Bhargava
DOI:10.1039/d3ra05651a
日期:——
The manuscript describes the highly regioselective 6-exo-dig iodo/bromo cyclization of functionalized N-propagyl-amino-pyrimidinones under ambient conditions. The cyclization afforded functionalized pteridines in excellent yields. The optimized procedures are mild, operationally simple and working successfully with different substrates. The synthesis of functionalized pteridines is of great significance