Novel synthetic routes suitable for constructing benzopyrone combinatorial libraries
摘要:
A series of O-(t-butylsilyloxy)benzoyl chlorides generated from the corresponding silyl esters were coupled with a range of terminal alkynes to afford the corresponding alkynyl ketones. The alkynyl ketones were converted to enaminoketones and then cyclized to yield the desired benzopyrone ring system. This synthetic protocol utilizes readily available starting materials, mild and high yielding reactions with good functional group tolerance, and is ideal for developing combinatorial libraries centered around the benzopyrone ring system. (C) 1999 Elsevier Science Ltd. All rights reserved.
Phototransformations of Some 2-Substituted 4<i>H</i>-Chromen-4-ones (4-Chromones) Related to the Antitumor Antibiotic Hedamycin
作者:Andreas Fredenhagen、Urs Séquin
DOI:10.1002/hlca.19830660218
日期:1983.3.16
The 2-substituted 4 H-chromen-4-ones (4-chromones) 2 and 3 have epoxysubstituted side chains at C(2) resembling that of the antibiotichedamycin (1). They were chosen as model compounds and subjected to photolysis either in the presence or in the absence of oxygen. The products obtained were isolated by repeated HPLC., and their structures were determined by spectroscopic methods, mainly 1H- and 13C-NMR
2-取代的4 H -chromen-4-ones(4- chromones )2和3在C(2)上具有环氧取代的侧链,类似于抗生素红霉素(1)的侧链。选择它们作为模型化合物,并在有氧或无氧条件下进行光解。通过重复HPLC分离获得的产物,并通过光谱法,主要是1 H-和13 C-NMR确定其结构。特别值得注意的是叔醇11和12的氧依赖性形成,以及二环氧苯并二氢吡喃酮3向烯丙基醇13和12的转化。在图14中,螺环化合物15和16以及2-乙基色酮19。
BEVAN, P. S.;ELLIS, G. P.;WILSON, H. K., J. CHEM. SOC. PERKIN TRANS., 1981, N 9, 2552-2556