A novel series of ferrocene tagged multi-functionalized 1,4-dihydropyrimidines is synthesized by base catalyzed cyclocondensation between ferrocenyl chalcones and amidines. The structures of synthesized compounds were established on the basis of H-1 NMR, C-13 NMR, FTIR spectroscopy as well as by mass spectrometry. The compounds were evaluated for in vitro anticancer activity. The most active compounds from the series displayed GI(50) value equal to doxorubicin against the strain of human breast cancer cell line MDA-MB-435. (C) 2013 Elsevier Masson SAS. All rights reserved.
A convenient regioselective synthesis of (2E)-2-[2,3,6-triarylpyrimidin-4(3H)-ylidene]acetonitriles through ring transformation reactions
作者:Umesh D. Patil、Pramod P. Mahulikar
DOI:10.1016/j.tetlet.2012.11.044
日期:2013.1
We report a greener, economical, highly convenient and regioselective synthesis of (2E)-2-[2,3,6-arylpyrimidin-4(3H)-ylidene)acetonitriles derivatives 3. This is achieved by a strategy involving ring transformation reaction of 4-(methylthio)-2-oxo-6-aryl-2H-pyran-3-carbonitrile 1 with N-arylbenzamidine or N-arylpicolinamidine 2 in the presence of KOH/DMF catalyst at room temperature. This approach provides a one-pot approach for the synthesis of symmetrical, unsymmetrical and heteroaryl pyrimidin-4(3H)-ylidene)acetonitriles derivatives 3.[GRAPHICS](C) 2012 Elsevier Ltd. All rights reserved.
PhI(OCOCF<sub>3</sub>)<sub>2</sub>-Mediated Intramolecular Oxidative N–N Bond Formation: Metal-Free Synthesis of 1,2,4-Triazolo[1,5-<i>a</i>]pyridines
readily synthesized from N-(pyridin-2-yl)benzimidamides via phenyliodine bis(trifluoroacetate)-mediated intramolecular annulation. This novel strategy allows for the convenient construction of a 1,2,4-triazolo[1,5-a]pyridine skeleton through direct metal-free oxidative N–N bond formation, featuring a short reaction time and high reaction yields.
具有生物学重要性的1,2,4-三唑并[1,5- a ]吡啶很容易通过苯基碘双(三氟乙酸)介导的分子内环化反应从N-(吡啶-2-基)苯甲酰胺酰胺合成。这种新颖的策略允许通过直接形成无金属的氧化性N–N键来方便地构建1,2,4-三唑并[1,5- a ]吡啶骨架,其反应时间短且反应产率高。