4-氧代-4 H -1-苯并吡喃在C-3处具有甲酰基,乙酰基或羧基取代基的异二烯环加成反应会生成3-烷氧基-或3,3-二烷氧基-4, 4a-二氢吡喃并[4,3- b ] [1]苯并吡喃-10-酮,在某些情况下,能够在多种条件下进行多种选择性转化,包括酸诱导的差向异构和/或逆环加成,还原,水解和醇解非常温和的条件。
The Domino Chromone Annulation and a Transient Halogenation-Mediated C–H Alkenylation toward 3-Vinyl Chromones
作者:Leiqing Fu、Zhongrong Xu、Jie-Ping Wan、Yunyun Liu
DOI:10.1021/acs.orglett.0c03548
日期:2020.12.18
Reported in this paper is a step economical method toward the general synthesis of 3-vinyl chromones via the reactions between readily available o-hydroxyphenyl enaminones and various alkenes. The domino C–H alkenylation and chromone annulation of the enaminones are involved, which enables the synthesis of 3-vinyl chromone products using both terminal and internal alkenes via a key process of transient C–H
Synthesis of Conjugated Dienes via a Biomimetic Aerobic Oxidative Coupling of Two C<sub>vinyl</sub>H Bonds
作者:Nicolas Gigant、Jan-E. Bäckvall
DOI:10.1002/chem.201301771
日期:2013.8.12
A time to dienes: A highly efficient and general method has been developed to prepare conjugateddienes through a biomimetic approach. This aerobic oxidative coupling, involving two CvinylH bonds, proceeds under low Pd catalyst loading and employs catalytic amounts of p‐benzoquinone and iron phthalocyanine as electron‐transfer mediators (ETMs) under ambient oxygen pressure (see scheme).
Substituted 4H-1-benzopyran-4-ones (chromones): synthesis via palladium-catalysed coupling of their halogeno derivatives with alkenes
作者:Stephen G. Davies、Bryan E. Mobbs、Christopher J. Goodwin
DOI:10.1039/p19870002597
日期:——
into the carbon–halogen bond. The resultant species undergo coupling with alkenes leading to vinylated chromones. Vinylation occurs regiospecifically at the original site of bromination and therefore provides a method for the clean introduction of substituents into the chromone ring system. An anomalous reaction of a dibrominated chromone leading to a ring-opened product is described.
Palladium(II)-Catalyzed Direct Intermolecular Alkenylation of Chromones
作者:Donghee Kim、Sungwoo Hong
DOI:10.1021/ol2018278
日期:2011.8.19
A new efficient method for the direct alkenylation of chromones via a palladium(II)-catalyzed C-H functionalization reaction was developed. The use of pivalic acid with Cu(OAc)(3)/Ag2CO3 provided superior reactivity in the cross-coupling of chromones with alkene partners. This approach represents a significant advance over the existing two-step method and afforded various 3-vinylchromone derivatives, which are privileged structures in many biologically active compounds and versatile synthetic building blocks.
Synthesis, Antiproliferative, and c-Src Kinase Inhibitory Activities of 4-Oxo-4<i>H</i>-1-benzopyran Derivatives
作者:Karam Chand、Rakesh K Tiwari、Sumit Kumar、Amir Nasrolahi Shirazi、Sweta Sharma、Erik V Van der Eycken、Virinder S Parmar、Keykavous Parang、Sunil K Sharma
DOI:10.1002/jhet.2106
日期:2015.3
A new class of 4‐oxo‐4H‐1‐benzopyran derivatives were synthesized and their antiproliferative activity examined against a panel of three human cancer cell lines, that is, breast carcinoma (MDA‐MB‐468), ovarian adenocarcinoma (SK‐OV‐3), and colorectal adenocarcinoma (HT‐29). Two compounds, that is, 3‐hexyl‐7,8‐dihydroxy‐4‐oxo‐4H‐1‐benzopyran and (E)‐ethyl 3‐(7‐methoxy‐4‐oxo‐4H‐1‐benzopyran‐3‐yl)acrylate were found to be potent against all three cancer cell lines studied at 50 μM concentration. Also, the inhibitory potency of the compounds was evaluated against active Src kinase. A few of these compounds exhibited modest Src kinase inhibitory activity (IC50 = 52–57 μM). Structure‐activity relationship studies with respect to the nature and position of substituents on the lead compounds could be further exploited for the design and development of more potent antiproliferative agents and/or Src kinase inhibitors.