Phenyliodonium Zwitterion as an Efficient Electrophile in the Palladium-Catalyzed Suzuki-Type Reaction: A Novel Method for the Synthesis of 3-Aryl-4-hydroxycoumarins
摘要:
A palladium-catalyzed coupling reaction of phenyliodonium zwitterions with aryl boronic acids has been developed. The unique characteristics of the mild reaction conditions and convenient synthetic accessibility of phenyliodonium zwitterions make this method a valuable tool for generating diversified 3-aryl-4-hydroxycoumarins.
Copper(I) Bromide-Dimethyl Sulfide-Catalyzed Direct Sulfanylation of 4-Hydroxycoumarins and 4-Hydroxyquinolinones with Arylsulfonylhydrazides and Selective Fluorescence Switch- On Sensing of Cadmium(II) Ion in Water
作者:Sanjay Paul、Rajeev Shrestha、T. N. J. I. Edison、Yong Rok Lee、Sung Hong Kim
DOI:10.1002/adsc.201600429
日期:2016.10.6
4‐hydroxycoumarins and 4‐hydroxyquinolinones in good yield with arylsulfonylhydrazides as sulfanylating agents was developed via copper(I) bromide⋅dimethyl sulfide‐catalyzed S–O, S–N bond cleavage and C–S cross‐couplingreactions. A highly selective fluorescence turning‐on sensing of cadmium(II) ions in water using the synthesized 3‐sulfanyl‐4‐hydroxycoumarin derivative was also investigated.
[EN] SUBSTITUTED FUROCHROMENE COMPOUNDS OF ANTIINFLAMMATORY ACTION<br/>[FR] COMPOSES DE FUROCHROMENE SUBSTITUES A ACTION ANTI-INFLAMMATOIRE
申请人:PLIVA ISTRAZIVACKI INST D O O
公开号:WO2005010006A1
公开(公告)日:2005-02-03
The present invention relates to novel compounds of the formula (I) including all stereoisomers and tautomers, to the pharmaceutically acceptable salts and solvates thereof, to the processes and reactive intermediates for their preparation and to their use in the prophylaxis and treatment of asthma and other inflammatory diseases and/or conditions in humans.
Pyrano[3,2-c]pyranone is an important structural motif present in many natural products exhibiting diverse biological activities. Two series of carbohydrate fused pyrano[3,2-c]pyranone derivatives (n = 20) were efficiently synthesized starting from 2-C-formyl galactal and 2-C-formyl glucal, reacting with various 4-hydroxycoumarins in a very short reaction time (10 min) under microwave assisted conditions
吡喃并[3,2- c ]吡喃酮是存在于表现出多种生物活性的许多天然产物中的重要结构基序。从2- C-甲酰基半乳糖和2- C-甲酰基葡糖开始,高效合成了两个系列的碳水化合物稠合的吡喃并[3,2- c ]吡喃酮衍生物(n = 20),可在很短的时间内与各种4-羟基香豆素反应微波辅助条件下的时间(10分钟)。这些合成的吡喃并[3,2- c ]吡喃酮的抗癌活性通过针对MCF-7(乳腺癌),MDA-MB-231(乳腺癌)和HepG2(肝)癌细胞系的细胞分析进行了详细测定。新合成的吡喃并[3,2- c筛选]吡喃酮对MCF-7,MDA-MB-231和HepG2细胞系的细胞活力和抗增殖活性。化合物12,13和14有选择地显示出高的生长抑制能力对MCF-7细胞用半最大抑制浓度(IC 50)为19.9,分别14.5和10.9μM值。化合物12,13,14,15和19分别抑制MDA-MB-231细胞(乳腺)的生
Synthesis and Evaluations of “1,4‐Triazolyl Combretacoumarins” and Desmethoxy Analogs
作者:Tashrique A. Khandaker、Jessica D. Hess、Renato Aguilera、Graciela Andrei、Robert Snoeck、Dominique Schols、Padmanava Pradhan、Mahesh K. Lakshman
DOI:10.1002/ejoc.201900569
日期:2019.9.8
A4 with coumarins, via a 1,2,3‐triazole. For this, 4‐azidocoumarins were accessed by a sequential two‐step, one‐pot reaction of 4‐hydroxycoumarins with (benzotriazol‐1‐yloxy)tris(dimethylamino)phosphonium hexafluorophosphate (BOP), followed by reaction with NaN3. In the reaction with BOP, a coumarin‐derived phosphonium ion intermediate seems to form, leading to an O 4‐(benzotriazolyl)coumarin derivative
DABCO-catalyzed one-pot three component synthesis of dihydropyrano[3,2-c]chromene substituted quinazolines and their evaluation towards anticancer activity
A facile DABCO promoted one-potthreecomponentsynthesis of a new series of C-C linked bis-heterocycle containing dihydropyrano[c]chromene as highly fused oxa-heteryl group at C-2 position of quinazoline was developed. Quinazoline-2-carbaldehyde, substituted 4-hydroxycoumarin and ethyl cyanoacetate were used as key components in the Knoevenagel-Michael addition reaction to get the titled compounds