A Practical Method for Oxazole Synthesis by Cycloisomerization of Propargyl Amides
摘要:
2,5-Disubstituted and 2,4,5-trisubstituted oxazol-5-yl carbonyl compounds were prepared in good yields by a mild SiO2-mediated cycloisomerization of propargyl amides.
A Practical Method for Oxazole Synthesis by Cycloisomerization of Propargyl Amides
摘要:
2,5-Disubstituted and 2,4,5-trisubstituted oxazol-5-yl carbonyl compounds were prepared in good yields by a mild SiO2-mediated cycloisomerization of propargyl amides.
A novel and efficient synthesis of 4-iminotetrahydropyrimidin-2-one derivatives was developed through a Cu(I)-catalyzed three-component tandem reaction employing propargylamines, isocyanates, and sulfonyl azides as starting materials. A wide range of polysubstituted 4-sulfonyliminotetrahydropyrimidin-2-ones, which might be useful in biological chemistry and medicinal science, were conveniently and
Novel one-step method for the conversion of isothiocyanates to 2-alkyl(aryl)aminothiazoles
作者:Pradip K. Sasmal、A. Chandrasekhar、S. Sridhar、Javed Iqbal
DOI:10.1016/j.tet.2008.09.074
日期:2008.12
2-Aminothiazole derivatives are widely used structural motifs in medicinal chemistry due to their broad application in drug development. Herein we demonstrate a novel one-step method for the synthesis of 2-aminothiazole derivatives from the corresponding isothiocyanates via thiourea formation followed by cycloisomerisation in an intramolecular thia-Michael fashion. This method is very mild, simple
strategy for the regioselective assembly of 2-aminoimidazole derivatives is herein described. Through a transition metal-free domino addition/cyclization process, the reactions of unsymmetrical carbodiimides with propargylic amines mediated by Cs2CO3 selectively afforded the corresponding polysubstituted 2-aminoimidazoles in moderate to good yields under very mild conditions. The regioselectivity was reversed
本文描述了2-氨基咪唑衍生物的区域选择性组装的方便的单步策略。通过无过渡金属的多米诺加成/环化过程,不对称碳二亚胺与Cs 2 CO 3介导的炔丙基胺的反应在非常温和的条件下以中等至良好的收率选择性地提供了相应的多取代的2-氨基咪唑。在较高温度下,在TEA存在下,区域选择性反转。所获得的2-(邻碘芳基)氨基咪唑可以容易地转化为2-(2-联苯基)氨基咪唑,2-(邻炔基苯基)氨基咪唑,苯并咪唑并[1,2- a ]咪唑和N-(咪唑-2-基)吲哚衍生物。
One-Pot Synthesis of Benzimidazo[2,1-<i>b</i>]thiazoline Derivatives through an Addition/Cyclization/Oxidative Coupling Reaction
A novel and efficient approach to the synthesis of benzimidazo[2,1-b]thiazoline derivatives has been developed through an addition/cyclization/intramolecular oxidative C–H functionalization process. A variety of alkylene benzimidazo[2,1-b] thiazolines were conveniently assembled from the reaction of aryl isothiocyanate and propargylic amine in the presence of Cu(OAc)2 and PIFA at room temperature.
通过加成/环化/分子内氧化C–H官能化过程,已开发出一种新颖且有效的合成苯并咪唑[2,1- b ]噻唑啉衍生物的方法。在室温下,在Cu(OAc)2和PIFA存在下,由异硫氰酸芳基酯和炔丙基胺反应可方便地组装各种亚烷基苯并咪唑并[2,1- b ]噻唑啉。该产物可以进一步转化为取代的苯并咪唑并[2,1- b ]噻唑衍生物。