环烷基[1,2- d ]恶唑[3,2 - a ]嘧啶-8 / 9-ones的合成和重排:进入环烷基[1,2- d ]恶唑[3,2 - a ]嘧啶-5的途径-那些
摘要:
通过一步式环缩合反应,由5-取代的2-取代基合成2-取代的4-a-羟基-9 H-环烷基[1,2- e ]恶唑基[3,2 - a ]嘧啶-9-酮2a - c。 -氨基-2-恶唑啉1a - c与2-氧代环己烷甲酸乙酯在室温下于乙醇中混合,并容易脱水以提供2-取代的9 H-环烷基[1,2- e ]恶唑啉[3,2- a ]嘧啶- 9个3。在回流的二甲苯中,与各种2-氧代环烷基羧酸乙酯进行的反应产生了两个异构的2-取代的-8/9 H-环烷基[1,2- e]恶唑[3,2 - a ]嘧啶-8 / 9-ones 3和2-取代的5 H-环烷基[1,2- d ]恶唑[3,2 - a ]嘧啶-5-ones 4。使用X射线晶体学可以明确地确定某些化合物的结构。根据化合物2a的DSC分析结果,热力学稳定的嘧啶酮4的形成可能与动力学控制的嘧啶酮3的分子内重排有关。
2-Amino-2-oxazolines, III: Synthesis, Structure, and Preliminary Pharmacological Evaluation of Cycloaddition Compounds with Unsaturated Carboxylic Esters
The reaction of 5‐substituted 2‐amino‐2‐oxazolines with unsaturatedcarboxylicesters yielded 2,3,5,6‐tetrahydro‐ and 2,3‐dihydro‐7H‐oxazolo[3,2‐a]pyrimidin‐7‐ones. The structure of these compounds was established by IR‐ and NMR‐spectra and by X‐ray crystallography. They were tested for anti‐arrhythmic and hypocholesterolemic activities.
5-取代的2-氨基-2-恶唑啉与不饱和羧酸酯反应生成2,3,5,6-四氢-和2,3-二氢-7H-恶唑并[3,2-a]嘧啶-7- . 这些化合物的结构是通过 IR 和 NMR 光谱以及 X 射线晶体学确定的。测试了它们的抗心律失常和低胆固醇活性。
Jarry; Golse; Panconi, European Journal of Medicinal Chemistry, 1986, vol. 21, # 2, p. 138 - 142
作者:Jarry、Golse、Panconi、Creuzet
DOI:——
日期:——
Reaction of 5-Substituted 2-Amino-2-oxazolines with Ethoxycarbonyl Isothiocyanate
作者:Christian Jarry、Isabelle Forfar、Jacqueline Thomas、Jean Michel Leger、Michel Laguerre
DOI:10.3987/com-93-6381
日期:——
The reaction of 2-amino-2-oxazolines with ethoxycarbonyl isothiocyanate was found to give only 2,3,6,7-tetrahydro-4H-oxazolo[3,2-a]-1,3,5-triazin-2-one-4-thiones, the structure of which was confirmed by X-ray crystallographic analysis. The direction of attack seems to be related to the more potent nucleophilic character of the endo nitrogen atom in 2-amino-2-oxazolines. In basic conditions the oxazoline ring can be easily hydrolyzed leading to 1-substituted 1,3,5-triazin-2,4-dione-6-thione.
Synthesis and Preliminary Pharmacological Evaluation of New 6-cyano-2,3-dihydro-5<I>H</I>-oxazolo[3,2-<I>a</I>]pyrimidin-5-ones and 2-ethyl(methylenecyanoacetate)-2-iminooxazolidines