Pyranonaphthoquinone derivatives of eleutherin, ventiloquinone L, thysanone and nanaomycin A possessing a diverse topoisomerase II inhibition and cytotoxicity spectrum
摘要:
A series of pyranonaphthoquinone derivatives related to the known topoisomerase II inhibitor eleutherin 1 have been shown to act as specific topoisomerase II catalytic inhibitors, with several analogues displaying greater potency than the natural product itself. Amongst the compounds tested were the natural products ventiloquinone L 4 and thysanone 8 with a diverse range of topoisomerase II inhibition properties being observed. Interestingly, the natural products are generally weaker inhibitors than their synthetic counterparts, emphasising that subtle changes in the basic molecular structure of a natural product led to significant changes in the inhibition profile. It has also been demonstrated for the first time that analogues related to nanaomycin A and cardinalin-type dimeric pyranonaphthoquinones exhibit potent topoisomerase II inhibitory properties. With respect to structural features, it appears that the nature of the substituents at C1 on the pyran ring and oxygenated substituents on the aryl ring are critical for anti-topoII activity.Importantly, the topoisomerase II inhibition strength does not correlate well with the measured cytotoxicity against yeast, indicating that other molecular features in the pyranonaphthoquinone family must be considered for the design and use of this structural class as highly specific topoisomerase II inhibitors. (C) 2009 Elsevier Ltd. All rights reserved.
Antimicrobial agents from higher plants: two dimethylbenzisochromans from Karwinskia humboldtiana
作者:Lester A. Mitscher、Sitaraghav R. Gollapudi、David S. Oburn、Steven Drake
DOI:10.1016/s0031-9422(00)82534-0
日期:1985.1
Abstract Two new antimicrobial dimethylbenzisochromans were isolated from the roots of Karwinskia humboldtiana together with the known 7-acetyl-6,8-dimethoxy-3-methyl-l-naphthol. The structures and absolute configurations were determined by spectroscopic examination and by chemical transformation to the known quinones eleutherin and 7-methoxyeleutherin.
Über die Konstitution des Eleutherins. (Inhaltsstoffe aus Eleutherine bulbosa (Mill.) Urb. III)
作者:H. Schmid、A. Ebnöther、Th. M. Meijer
DOI:10.1002/hlca.19500330644
日期:——
Aus den Knollen vonEleutherinebulbosa wurde ein bisher unbekanntes, rechtsdrehendes Naphtochinon, Eleutherin (I), isoliert und in seiner Konstitution aufgeklärt. I enthält einen Dimethylisopyranring; es konnte unter Ringöffnung über das furanoide Reduktionsprodukt XVIII in das gelbe, optisch inaktive ψ-Eleutherin (XXIII) umgewandelt werden.
Isolierung und Konstitution des Isoeleutherins. Allo- und Alloiso-eleutherin<sup>1</sup>). (Inhaltsstoffe aus Eleutherine bulbosa IV)
作者:H. Schmid、A. Ebnöther
DOI:10.1002/hlca.19510340220
日期:——
1. Aus den Knollen von Eleutherine bulbosa (Mill.) Urb. wurde einneues Naphtochinon, das Isoeleutherin (II) isoliert.
1.来自伊勒瑟林鳞茎(Mill。)Urb的块茎。分离出一种新的萘醌,异亮氨酸(II)。
Total synthesis of enantiopure 1,3-dimethylpyranonaphthoquinones including ventiloquinones E, G, L and eleutherin
作者:Leonie M. Tewierik、Christian Dimitriadis、Christopher D. Donner、Melvyn Gill、Brendan Willems
DOI:10.1039/b607366b
日期:——
A new synthetic approach to enantiopure pyranonaphthoquinones is described. (S)-Mellein 10, prepared in 6 steps from (S)-propylene oxide 16, is converted stereospecifically to the (1R,3S)-dimethylpyran 15. The pyran 15 is then converted to the benzoquinone 14, which undergoes regiospecific Diels-Alder reactions with a variety of oxygenated butadienes to give pyranonaphthoquinones including ventiloquinones
描述了一种新的对映体纯吡喃并萘醌的合成方法。由(S)-环氧丙烷16分6步制备的(S)-Mellein 10立体定向转化为(1R,3S)-二甲基吡喃15。然后将吡喃15转化为苯醌醌14,并进行区域特异性Diels-与各种含氧丁二烯进行Alder反应,得到吡喃并萘醌,包括ventiloquinones E,G,L,leutherin和ent-deoxyquinone A.