Highly Stereoselective Formation of 1,3-Dioxolanes by Photocatalytic Ring Opening Reactions of a-Epoxyketones in Acetone Solution Using 1-Benzyl-2,4,6-triphenylpyridinium Tetrafluoroborate (NBTPT)
simple substrates. However, they usually involve the employment of organic halides and suffer from toxic or environmental issues. We report an efficient and environmentally benign methodology—aerobic oxidative cross-coupling of primary and secondary alcohols—to directly produce α,β-unsaturated ketones that are key intermediates for synthesis of agrochemical, pharmaceutical, and other fine chemicals. A noble-metal-free
C–C键形成反应在化学中对于从容易获得的简单底物构建复杂大分子非常重要。但是,它们通常涉及有机卤化物的使用,并且具有毒性或环境问题。我们报告了一种有效且对环境无害的方法-伯醇和仲醇的好氧氧化交叉偶联-直接生产α,β-不饱和酮,这是合成农业化学,制药和其他精细化学品的关键中间体。一种无贵金属的Co–N–C催化剂,是由钴-菲咯啉配合物在中孔碳载体上热解衍生而来的,可用于目标反应,并具有很高的催化活性(转换频率为3.8 s –1基于Co的单原子,超过了文献中的技术水平),良好的可回收性以及对各种基材的广泛适用性(28个示例)。有人建议在Co–N–C催化剂中的活性位是在石墨薄片内与N键合的Co单原子。
Novel benzothiazole based sulfonylureas/sulfonylthioureas: design, synthesis and evaluation of their antidiabetic potential
Synthesis and application of modified silica sulfuric acid as a solid acid heterogeneous catalyst in Michael addition reactions
作者:Mohammad Ali Zolfigol、Hojat Veisi、Farajollah Mohanazadeh、Alireza Sedrpoushan
DOI:10.1002/jhet.659
日期:2011.7
Modified silicasulfuricacid (MSSA) as a new type of silicasulfuricacid was prepared and effectively used in the conjugate addition of indole, pyrrole, and thiols with Michael acceptors under mild conditions at room temperature. Also, MSSA was used as a catalyst for the synthesis of 1,1,3‐tri‐indolyl compounds in good to excellent yield at room temperature. J. Heterocyclic Chem., (2011).
An efficient, one-pot and three-component synthesis of a new series of 2-acyl-3,4,6-triaryl-1,4-dihydropyrazines is described. This two-step strategy involves treatment of phenacyl bromides and anilines to give the nucleophilic substitution intermediate followed by Michael-addition-cyclization to α-azidochalcones to afford the title compounds in high yields.
aims at the synthesis of pyrazolines bearing benzothiazole and their evaluation as anti-inflammatoryagents. The synthesized compounds were evaluated for their anti-inflammatorypotential using carrageenan induced paw edema model. Two compounds 5a and 5d alleviated inflammation more than the standard drug celecoxib. Eight compounds 5b, 5c, 5e, 5g, 5h, 6b, 6e and 6f showed anti-inflammatory activity comparable