2-Methoxy-3-trifluoroacetyl-4-quinolylamine reacted easily with various aldehydes in the presence of aqueous ammonia to afford mainly trifluoromethylated pyrimido[5,4-c]quinoline derivatives in moderate to high yields. In contrast, the use of ketones instead of aldehydes in the presence of pyrrolidine, exclusively gave benzo[h][1,6]naphthyridine derivatives in good to excellent yields.
(β-<scp>D</scp>-Ribofuranosyl)formamidine in the Design and Synthesis of 2-(β-<scp>D</scp>-Ribofuranosyl)pyrimidines, Including R<sup>F</sup>-Containing Derivatives
作者:Viktor O. Iaroshenko、Sergii Dudkin、Vyacheslav Ya. Sosnovskikh、Alexander Villinger、Peter Langer
DOI:10.1002/ejoc.201300107
日期:2013.5
A wide range of novel 2-(β-D-ribofuranosyl)pyrimidines, including RF-containing derivatives, have been synthesized by the reaction of (β-D-ribofuranosyl)formamidine with various dielectrophilic substrates such as 3-alkoxy- and 3-chloro-1-(polyfluoroalkyl)propen-1-ones, 3-nitro- and 3-(phenylethynyl)chromones and heteroaryl acetylenic ketones.
Synthesis of dichloromethyl-substituted salicylates and pyran-4-ones by cyclocondensation of 1,3-bis(silyloxy)-1,3-butadienes with 1,1-dimethoxy-4,4-dichlorobut-1-en-3-one: control of the C,C- and C,O-regioselectivity by the choice of Lewis acid
The TiCl4-mediated formal [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 1,1-dimethoxy-4,4-dichlorobut-1-en-3-one afforded a variety of functionalized 6-dichloromethyl-4-methoxysalicylates with very good regioselectivity. Some of the products were transformed into 6-formyl-4-methoxysalicylates. The employment of Me3SiOTf instead of TiCl4 resulted in a change of the regioselectivity
Synthesis of substituted 2-heteroarylbenzazol-5-ol derivatives as potential ligands for estrogen receptors
作者:Sina Rezazadeh、Latifeh Navidpour、Abbas Shafiee
DOI:10.1016/j.tet.2013.05.084
日期:2013.7
Exposure to estrogen is associated with increased risk of breast and other types of human cancer. One therapeutic goal would be the creation of new molecules that would retain hormonal potency while incorporating features to retard or prevent quinone toxicity. Hence, new structures closely related to ERB-041, a known ERβ selective agonist, were synthesized whereas the phenol ring is substituted with
Identification of reaction intermediates in AlCl3-mediated cyclocondensation reactions by simultaneous in situ ATR-FTIR and UV–vis spectroscopy
作者:Sebastian Reimann、Leif R. Knöpke、Anke Spannenberg、Angelika Brückner、Oliver Kühn、Peter Langer、Ursula Bentrup
DOI:10.1016/j.tet.2013.01.097
日期:2013.4
Simultaneous in situ ATR-FTIR/UV–vis spectroscopic measurements were carried out for mechanistic studies. Real-time in situ spectroscopic investigations reveal the formation of an aluminumtrichloride bidentate-butenone adduct as intermediate. The observed band shifts in the respective UV–vis spectra in consequence of complex formation could be explained by theoretical calculations. Lewis acidic solids
基于AlCl 3介导的环缩合反应,使用4,4-二甲氧基-1,1,1-三氟丁-3-烯-2-酮和1,3-双(甲硅烷氧基)-1,合成了功能化的三氟甲基取代的水杨酸酯。 3-丁二烯。同时进行原位ATR-FTIR / UV-vis光谱测量以进行机理研究。实时原位光谱研究揭示了作为中间体的三氯化铝二齿铝-丁烯酮加合物的形成。可以通过理论计算来解释由于形成复合物而在各个UV-vis光谱中观察到的谱带位移。路易斯酸性固体(Al 2 O 3和TiO 2)也被成功利用。由于通过UV-vis-DRS和FTIR透射光谱法检测到的固体对基质的强烈吸附,因此获得的产率相当适中。
First Cyclocondensations of
1,3-Bis(trimethylsilyloxy)buta-1,3-dienes with 1,1-Dimethoxy-4,4,4-trifluorobut-1-en-3-one
The formal [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)buta-1,3-dienes with 1,1-bis(methoxy)trifluoromethyl-1-en-3-ones afforded functionalized 3-methoxy-5-(trifluoromethyl)phenols with very good regioselectivity.