Tandem Claisen Rearrangement/6-<i>endo</i>Cyclization Approach to Allylated and Prenylated Chromones
作者:Bernd Schmidt、Martin Riemer、Uwe Schilde
DOI:10.1002/ejoc.201501151
日期:2015.12
o-acylphenols reacted upon microwave irradiation to form C-allylated or -prenylated chromone derivatives, depending on the substitution pattern of the arene and the allyl substituent. The reaction proceeds through a tandemClaisen rearrangement and 6-endo-trig or 6-endo-dig cyclization sequence. For prenyl ethers, the tandem sequence can be extended by a Cope rearrangement to furnish 6-prenylchromones.
of 11 derivatives of flavone‐8‐acetic acid (FAA) in which the structure has been substantially altered in different ways have been prepared and their anti‐tumour activity evaluated in vitro against a panel of human and murine tumour cell lines and in vivo against MAC 15A. The generally poor activity observed shows that the basic structure cannot be altered much without destroying the activity.
已经制备了一系列 11 种黄酮 - 8 - 乙酸 (FAA) 衍生物,其中结构以不同方式发生了实质性改变,并在体外针对一组人和鼠肿瘤细胞系以及在体外评估了它们的抗肿瘤活性。 vivo 对抗 MAC 15A。观察到的普遍较差的活动表明,在不破坏活动的情况下,基本结构无法改变太多。
Synthesis and Antitumour Activity of New Derivatives of Flavone-8-acetic Acid (FAA). Part 2: Ring-Substituted Derivatives
作者:R. Alan Aitken、Michael C. Bibby、John A. Double、Andrea L. Laws、Robert B. Ritchie、David W. J. Wilson
DOI:10.1002/ardp.19973300706
日期:——
A range of 18 derivatives of flavone‐8‐acetic acid (FAA) with substituents on the 2‐phenyl group have been prepared and their anti‐tumour activity evaluated in vitro against a panel of human and murine tumour cell lines and in vivo against MAC 15A. There was no clear‐cut relationship between in vitro and in vivo activity but the activity in each situation was found to be very sensitive to the precise
Scope and Applications of 2,3-Oxidative Aryl Rearrangements for the Synthesis of Isoflavone Natural Products
作者:George Kwesiga、Eric Sperlich、Bernd Schmidt
DOI:10.1021/acs.joc.1c01375
日期:2021.8.6
hypervalent iodine reagents was investigated with a view to the synthesis of naturally occurring isoflavones. In contrast to several previous reports in the literature, we did not observe the formation of any benzofurans via a ring contraction pathway, but could isolate only isoflavones, resulting from an oxidative 2,3-aryl rearrangement, and flavones, resulting from an oxidation of the flavanones. Although