Biomimetic studies towards the cardinalins: synthesis of (+)-ventiloquinone L and an unusual dimerisation
作者:Jonathan Sperry、Jimmy J. P. Sejberg、Frank M. Stiemke、Margaret A. Brimble
DOI:10.1039/b905077a
日期:——
Studiestowards the biomimetic synthesis of cardinalin 3 are described. Despite the successful enantioselective synthesis of the monomeric pyranonaphthoquinone ventiloquinone L, it subsequently failed to undergo a proposed biomimetic homodimerisation to cardinalin 3 using a range of oxidants. However, treatment of a related naphthopyran with cerium ammonium nitrate (CAN) facilitated a tandem biaryl
An overview of the synthesis of the fungal metabolites (+)-dermolactone, (–)- semixanthomegnin, (+)- and (–)-mellein, (–)-ochratoxin α, (–)-(1R,3S)-thysanone, the enantiopure ventiloquinones L, E and G, and 8-desmethyleleutherin from a common chiral intermediate, is presented. Further methodology leading potentially toward extended quinones such as (3S,3'S)-xylindein is also outlined.
综述了真菌代谢物 (+)-dermolactone, (-)- semixanthomegnin, (+)- and (-)-mellein, (-)-ochratoxin α, (-)-(1R,3S)-thysanone, 对映体纯 ventiloquinones L, E 和 G 以及 8-desmethyleleutherin 的合成。此外,还概述了进一步研究扩展醌(如 (3S,3'S)-xylindein)的方法。
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.