余正坤研究員領(lǐng)導(dǎo)的有機(jī)金屬催化與合成研究組在具有抗癌活性的海洋天然產(chǎn)物吲哚生物堿meridianins的合成研究中取得重要進(jìn)展,最新成果以通訊形式發(fā)表在最近一期的德國(guó)《應(yīng)用化學(xué)》(Angew. Chem. Int. Ed. ),。
Meridianins是從海洋生物海鞘類中提取出來(lái)的,、對(duì)多種蛋白質(zhì)激活酶有抑制作用、影響細(xì)胞的分裂和死亡的一類重要的有生物活性的生物堿,。自從1998年被首次人工提取以來(lái),,有關(guān)它們及其衍生物的合成與生物活性研究日益受到人們的關(guān)注。5`和6`-位取代meridianins的合成是此領(lǐng)域的研究熱點(diǎn),,已報(bào)道的合成方法主要是通過(guò)對(duì)已知meridianins進(jìn)行化學(xué)修飾來(lái)制備,。雖然已成功制備了它們的某些衍生物,但方法缺乏靈活性,、適用范圍窄,。
余正坤研究組從易制備、結(jié)構(gòu)多樣性的二硫縮烯酮出發(fā), 利用其與吲哚3-位的高選擇性酸催化取代反應(yīng),,實(shí)現(xiàn)了鮮有報(bào)道的吲哚直接烯基化,。將所得烯基化產(chǎn)物與硝酸胍縮合高效得到了6`-取代的meridianins。相關(guān)研究發(fā)展了一種新型,、適用范圍廣,、能高效地合成具有潛在抗癌活性的海洋天然產(chǎn)物吲哚生物堿6`-取代meridianins的方法,拓展了吲哚直接烯基化化學(xué),。(生物谷Bioon.com)
生物谷推薦原始出處:
Angewandte Chemie International Edition Volume 48 Issue 16
Direct Alkenylation of Indoles with α-Oxo Ketene Dithioacetals: Efficient Synthesis of Indole Alkaloids Meridianin Derivatives
Haifeng Yu, Dr. 1, Zhengkun Yu, Prof. Dr. 1 2 *
1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (P.R. China), Fax: (+86) 411-8437-9227, http://www.omcat.dicp.ac.cn
2State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032 (P.R. China)
*Correspondence to Zhengkun Yu, 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (P.R. China)
Let's make 'meri': Metal-free direct alkenylation of indoles was realized by acid-mediated substitution reactions of α-oxo ketene dithioacetals with indoles in trifluoroacetic acid/dichloromethane, selectively affording β-indolyl mono- and disubstituted α,β-unsaturated carbonyl compounds (see scheme). Condensation of the indolyl/ketene monothioacetals and guanidine nitrate efficiently produced meridianin derivatives.