Direct Alkynylation of 3<i>H</i>-Imidazo[4,5-<i>b</i>]pyridines Using <i>gem</i>-Dibromoalkenes as Alkynes Source
作者:Jessy Aziz、Tom Baladi、Sandrine Piguel
DOI:10.1021/acs.joc.6b00406
日期:2016.5.20
C2 direct alkynylation of 3H-imidazo[4,5-b]pyridine derivatives is explored for the first time. Stable and readily available 1,1-dibromo-1-alkenes, electrophilic alkyne precursors, are used as coupling partners. The simple reaction conditions include an inexpensive copper catalyst (CuBr·SMe2 or Cu(OAc)2), a phosphine ligand (DPEphos) and a base (LiOtBu) in 1,4-dioxane at 120 °C. This C–H alkynylation
首次探索了3 H-咪唑并[4,5- b ]吡啶衍生物的C2直接炔基化。稳定且易于获得的1,1-二溴-1-烯烃(亲电炔前体)用作偶联伙伴。简单的反应条件包括:廉价的铜催化剂(CuBr·SMe 2或Cu(OAc)2),膦配体(DPEphos)和1,4-二恶烷中的碱(LiO t Bu)在120°C的条件下。该C-H炔基化方法显露是与各种上两个耦合伙伴取代的兼容:杂芳烃和宝石-dibromOAlkenes。该协议可以直接合成各种2-炔基-3 H-咪唑并[4,5- b]吡啶,一种在药物设计中有价值的支架。
Synthesis of rooperol [1,5-bis(3′,4′-dihydroxyphenyl)pent-1-en-4-yne]
作者:Maudene Potgieter、George L. Wenteler、Siegfried E. Drewes
DOI:10.1016/0031-9422(88)80282-6
日期:——
Abstract Rooperol, a phenolic compound bearing the pentenyne moiety, has been synthesized from simple starting materials via a nine step synthesis. A crucial step in the synthesis involves protection of the phenolic groups as the tertbutyldimethylsilyl ether derivative.
Hydroxytyrosol, a natural polyphenol that can be extracted from olive mill waste waters, was converted into a series of more complex and lipophilic analogues by conjugation with other naturally derived (poly)phenolicfragments. Ether and triazole linkers were employed. A small library of compounds was prepared, stressing step economy and operational simplicity. Some of these substances were proven
Microwave-Assisted C-2 Direct Alkenylation of Imidazo[4,5-<i>b</i>]pyridines: Access to Fluorescent Purine Isosteres with Remarkably Large Stokes Shifts
作者:Tom Baladi、Anton Granzhan、Sandrine Piguel
DOI:10.1002/ejoc.201600166
日期:2016.5
We describe herein the first C-2 direct alkenylation of the valuable 3H-imidazo[4,5-b]pyridine promoted by microwave-assisted Pd/Cu co-catalysis. The reaction is rapid and compatible with a wide range of functional groups either on the imidazo[4,5-b]pyridine ring or on the styryl bromides thereby leading to the isolation of 23 compounds with moderate to good yields. The relevance of this method is
Butein derivatives prevent obesity and improve insulin resistance through the induction of energy expenditure in high-fat diet-fed obese mice
作者:Seo-Hyuk Chang、Dawoon Song、Seungjun Oh、Saro-Areum Han、Ji-Man Jung、No-Joon Song、Hee Kang、Sukchan Lee、Jee-Yin Ahn、Seunghyun Ahn、Yu-Ran Na、Chang-hwan Yeom、Kye Won Park、Jin-Mo Ku
DOI:10.1016/j.ejps.2024.106820
日期:2024.8
Obesity is a global public health problem and is related with fatal diseases such as cancer and cardiovascular and metabolic diseases. Medical and lifestyle-related strategies to combat obesity have their limitations. White adiposetissue (WAT) browning is a promising strategy for increasing energy expenditure in individuals with obesity. Uncoupling protein 1 (UCP1) drives WAT browning. We previously
肥胖是一个全球性的公共卫生问题,与癌症、心血管和代谢疾病等致命疾病有关。对抗肥胖的医疗和生活方式相关策略都有其局限性。白色脂肪组织(WAT)褐变是增加肥胖个体能量消耗的一种有前景的策略。解偶联蛋白 1 (UCP1) 会导致 WAT 褐变。我们之前筛选了能够诱导 WAT 褐变并增加饮食诱导肥胖小鼠能量消耗的天然产品。在这项研究中,我们的目标是广泛优化先前显示可促进 WAT 褐变的化合物的结构。化合物3在白色和棕色脂肪细胞中表现出比化合物显着更高的诱导能力。在没有任何毒理学观察的情况下,每天注射 5 mg/kg 的化合物 3 可以防止高脂饮食喂养的小鼠体重增加 13.6%。此外,化合物3可显着改善葡萄糖稳态,降低血清三酰甘油水平,并降低总胆固醇和低密度脂蛋白胆固醇水平,而无需改变饮食摄入或体力活动。与化合物1相比,化合物3s的溶解度、亲脂性、膜通透性等药物特性以及代谢稳定性、半衰期(T)、腹膜