Efficient synthesis of benzopyrano[2,3-b]pyridines by sequential reactions of 1,3-bis-silyl enol ethers with 3-cyanobenzopyrylium triflates
摘要:
Benzopyrano[2,3-b]pyridines were efficiently prepared by condensation of 1,3-bis-silyl enol ethers with 3-cyanobenzopyrylium triflates and Subsequent domino 'retro-Michael-lactonization-aldol' reactions. (C) 2003 Elsevier Science Ltd. All rights reserved.
Synthesis of 1-azaxanthones by condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-(cyano)benzopyrylium triflates and subsequent domino ‘retro-Michael/nitrile-addition/heterocyclization’ reaction
Functionalized 1-azaxanthones (5-oxo-5H-[1]-benzopyrano[2,3-b]pyridines) were prepared by TMSOTf-mediated condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-cyanochromones and subsequent base-mediated domino ‘retro-Michael/nitrile-addition/heterocyclization’ reaction.
通过TMSOTf介导的1,3-双(三甲基甲硅烷氧基)-1,3-丁二烯与3的缩合反应制备功能化的1-azaxanthones(5-oxo-5 H- [1]-苯并吡喃并[2,3- b ]吡啶)。 -氰基色酮和随后的碱基介导的多米诺骨牌“复古迈克尔/腈加成/杂环化”反应。
Ultrasound promoted synthesis of chromeno[2,3-b]pyridines and their evaluation as lipid peroxidation inhibitors
作者:Eleni Dimitriadou、Marianna Raftopoulou、Paraskevi M. Kasapidou、Constantinos A. Tsoleridis、Julia Stephanidou-Stephanatou、Dimitra J. Hadjipavlou-Litina、Christos Kontogiorgis、Agathi Pritsa、Athanasios Papadopoulos
DOI:10.3998/ark.5550190.p008.754
日期:——
A series of 2,3-disubstituted-5-oxochromeno[2,3-b]pyridine derivatives were synthesized under ultrasound irradiation, and also under conventional methods, from the reaction of 3cyanochromones with some active methylene compounds in the presence of a stoichiometric base. The structures of the products were unambiguously elucidated by 1D and 2D NMR experiments. Full assignment of all H and C NMR chemical
一系列 2,3-二取代-5-氧代色基 [2,3-b] 吡啶衍生物在超声辐照下合成,也在常规方法下,由 3-氰基色酮与一些活性亚甲基化合物在化学计量碱存在下的反应合成. 通过一维和二维核磁共振实验明确阐明了产物的结构。已实现所有 H 和 C NMR 化学位移的完全分配。此外,还评估了合成的色诺吡啶衍生物的脂质过氧化抑制作用。
One-Pot Five-Component Synthesis of Spirocyclopenta[<i>b</i>]chromene Derivatives and Their Acid-Catalyzed Rearrangement
作者:Michael A. Terzidis、Tryfon Zarganes-Tzitzikas、Constantinos Tsimenidis、Julia Stephanidou-Stephanatou、Constantinos A. Tsoleridis、George E. Kostakis
DOI:10.1021/jo3014947
日期:2012.10.19
tert-butylisocyanide or cyclohexylisocyanide and acetylenedicarboxylates, with 3-cyanochromones is described, whereupon spirochromenofuran derivatives 5 or 6 were obtained in good yields. The subsequent acid-catalyzedrearrangement of the isolated 2-imino-spirochromenofurans 5 to 2-amino-spirochromenofurans 7 has also been studied. Rational mechanistic schemes for the formation of compounds 5, 6, and 7 are proposed
描述了由叔丁基异氰化物或环己基异氰酸酯与乙炔二羧酸酯原位产生的两性离子中间体与3-氰基色酮的反应,从而以良好的产率获得了螺色呋喃呋喃衍生物5或6。还研究了分离的2-亚氨基-吡咯并呋喃并呋喃5到2-氨基-吡咯并呋喃并呋喃7的随后的酸催化重排。理性机械方案为化合物的形成5,6,和7被提议。产物的结构阐明是通过1D和2D NMR实验完成的,并由X射线晶体学分析证实。借助DFT / GIAO计算已明确实现了所有1 H和13 C NMR化学位移的完全分配。
Penicillins and their antibacterial use
申请人:Sandoz Ltd.
公开号:US04320133A1
公开(公告)日:1982-03-16
The invention provides novel penicillins and cephalosporins of formula I, ##STR1## methods for their production and their anti-bacterial use.
本发明提供了公式I的新型青霉素和头孢菌素,以及它们的生产方法和抗菌用途。##STR1##
Chalcone and its analogs as agents for the inhibition of angiogenesis and related disease states
申请人:Bowen J. Phillip
公开号:US20090018167A1
公开(公告)日:2009-01-15
The present invention relates to chalcone and chalcone derivatives and analogs which are useful as angiogenesis inhibitors. The present compounds, which are inexpensive to synthesize, exhibit unexpectedly good activity as angiogenesis inhibitors. The present invention also relates to the use of chalcone and its analogs as antitumor/anticancer agents and to treat a number of conditions or disease states in which angiogenesis is a factor, including angiogenic skin diseases such as psoriasis, acne, rosacea, warts, eczema, hemangiomas, lymphangiogenesis, among numerous others, as well as chronic inflammatory disease such as arthritis.