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首页> 外文期刊>The Journal of Antibiotics: An International Journal >Graminin B, a furanone from the fungus Paraconiothyrium sp.
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Graminin B, a furanone from the fungus Paraconiothyrium sp.

机译:Graminin B,一种来自真菌Paraconiothyrium sp。的呋喃酮。

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摘要

Members of the furanone structural class of natural oxygenated heterocycles have been reported from fungi of the genera Cephalosporium (for example, gregatins and graminin A), Aspergillus (huaspenone A and B or the unnamed tetronic acid derivatives from A. panamensis) and Penicillium (penicilliol). The structure initially proposed of 3-acyl-4-methoxyfuran-2(5H)-one was later revised to a structure of 4-acyl-5-methoxyfuran-3(2H)-one after the total synthesis of racemic and (+ )-gregatin B by Takaiwa and Yamashita.7'8 Very recently, a serendipitous synthesis of (+ )-gregatin B9 and total syntheses of the gregatins A-D and aspertetronin A10 led to a second structural revision establishing a central core of 4-(methoxycarbonyl)furan-3(2H)-one as the right structure for the members of this family of secondary metabolites (Figure 1).
机译:天然氧化杂环的呋喃酮结构类别的成员已从头孢霉属的真菌(例如,凝集素和graminin A),曲霉菌(huaspenone A和B或来自A. panamensis的未命名的tetronic酸衍生物)和青霉菌(青霉酚)中报道。 )。外消旋和(+)的全合成后,最初提出的3-酰基-4-甲氧基呋喃-2(5H)-1的结构后来被修改为4-酰基-5-甲氧基呋喃-3(2H)-1的结构。 -7.8最近,(+)-聚集蛋白B9的偶然合成以及聚集蛋白AD和曲霉毒素A10的全部合成导致第二个结构修订,建立了4-(甲氧基羰基)的核心呋喃-3(2H)-一个是该次级代谢产物家族的正确结构(图1)。

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