NHC-Catalyzed Reaction of Enals with Hydroxy Chalcones: Diastereoselective Synthesis of Functionalized Coumarins
作者:Anup Bhunia、Atanu Patra、Vedavati G. Puranik、Akkattu T. Biju
DOI:10.1021/ol400562z
日期:2013.4.5
The N-heterocyclic carbene-catalyzed annulation of enals with 2′-hydroxy chalcones afford cyclopentane-fused coumarin derivatives with an excellent level of diastereocontrol. The reaction tolerates a broad range of functional groups; 25 examples are given, and a preliminary mechanistic investigation is provided.
Synthesis of 5-subsituted flavonols via the Algar-Flynn-Oyamada (AFO) reaction: The mechanistic implication
作者:Xianyan Shen、Qiang Zhou、Wei Xiong、Wenchen Pu、Wei Zhang、Guolin Zhang、Chun Wang
DOI:10.1016/j.tet.2017.06.064
日期:2017.8
Herein, we report a synthetic method with improved selectivity for 5-substituted flavonols via the Algar-Flynn-Oyamada reaction (AFO), by using of sodium carbonate/hydrogen peroxide A series of 5-substituted flavonols was obtained with moderate to high yields. The mechanism of the AFO reaction was elucidated. LCMS analysis and in situ 1H NMR analysis indicated that the epoxide was involved in the transformation
本文中,我们报告了一种合成方法,该方法通过使用碳酸钠/过氧化氢,通过Algar-Flynn-Oyamada反应(AFO)对5-取代的黄酮醇进行了改进,具有中等至高收率的一系列5-取代的黄酮醇。阐明了AFO反应的机理。LCMS分析和原位1 H NMR分析表明,在碱性碱/过氧化物条件下,环氧化物参与了从查尔酮到黄酮醇和/或金酮的转化。
[EN] COMPOSITION FOR TREATING DIABETES AND METABOLIC DISEASES AND A PREPARATION METHOD THEREOF<br/>[FR] COMPOSITION POUR LE TRAITEMENT DU DIABÈTE ET DE MALADIES MÉTABOLIQUES, ET SON PROCÉDÉ DE PRÉPARATION
申请人:UNIV KAOHSIUNG MEDICAL
公开号:WO2013022951A1
公开(公告)日:2013-02-14
Disclosed is a chalcone composition for treating diabetes and metabolic syndromes. In particular, the chalcone compound bound with 2-halogen in ring A significantly decreases the blood glucose level in the in vitro anti-diabetic effect experiment. In the in vivo animal model, the leading chalcone compound can prevent the progression of diabetes and control the blood glucose level, and there is no significant difference in the gains in body weight. Throughout the seven-week administration, there are no hepatic or renal toxicity observed.
A new synthesis of novel alkenylated flavones by palladium-catalyzed cross-coupling reactions
作者:Szabolcs Fekete、Tamás Patonay、Artur M. S. Silva、José A. S. Cavaleiro
DOI:10.3998/ark.5550190.0013.519
日期:——
Bromoflavones were treated with various terminal alkynes in palladium-catalyzedcross-couplingreactions under phosphine-free condions to give the expected alkenylatedflavones in moderate to good yields. The presence of two differenthydrogens in the terminal alkene led to the formation of both alkenylated and alkylated products.
From Simple to Complex: Rhodium(III)-Catalyzed C–C Bond Cleavage and C–H Bond Functionalization for the Synthesis of 3a,8b-Dihydro-1<i>H</i>-cyclopenta[<i>b</i>]benzofuran-1-ones
A rhodium(III)-catalyzed strategy for the one-step synthesis of polysubstituted cis-3a,8b-dihydro-1H-cyclopenta[b]benzofuran-1-ones from simple 2′-hydroxychalcones and alkynes is developed. This novel transformation involves a sequential C–C bond cleavage and dehydrogenative annulation, leading to the product bearing a quaternary and a tertiary carbon center. 13C labeling experiments revealed that
提出了一种由铑(III)催化从简单的2'-羟基查耳酮和炔烃一步合成多取代的顺式-3a,8b-二氢-1 H-环戊[ b ]苯并呋喃-1-酮的策略。这种新颖的转变涉及到连续的C–C键断裂和脱氢环化反应,从而使产物带有一个四级和三级碳中心。13 C标记实验表明,CC键断裂不仅发生在C–C(C═O)键处,而且发生在C≡C键处。这项研究提供了一种使用C–C键断裂的替代策略,从而证明了该策略与C–H键功能化相结合的能力,可从简单的起始材料组装复杂的结构。