Pseudoanguillosporin A and B: Two New Isochromans Isolated from the Endophytic Fungus<i>Pseudoanguillospora</i>sp.
作者:Ines Kock、Siegfried Draeger、Barbara Schulz、Brigitta Elsässer、Tibor Kurtán、Ágnes Kenéz、Sándor Antus、Gennaro Pescitelli、Piero Salvadori、John-Bryan Speakman、Joachim Rheinheimer、Karsten Krohn
DOI:10.1002/ejoc.200801083
日期:2009.3
Two new isochromans named pseudoanguillosporin A (2a) and B (3), together with the known cephalochromin (1), were isolated from Pseudoanguillospora sp. The C-2 absolute configuration of 2a and 3 was deduced from its CD spectrum by the isochroman helicity rule, supported by TDDFT CD calculations. The absolute configuration of the sec-hydroxyl group of 3 was determined by the Mosher NMR method from the
从 Pseudoanguillosporin sp. 中分离出两个新的异色体,命名为假丝状孢菌素 A (2a) 和 B (3),以及已知的头色素蛋白 (1)。2a 和 3 的 C-2 绝对构型是通过等色满螺旋度规则从其 CD 光谱推导出来的,并得到 TDDFT CD 计算的支持。3的仲羟基的绝对构型通过Mosher NMR方法从其甲基化衍生物的MPA酯确定。1 的轴向手性是通过对其 CD 光谱的激子分析确定的,并通过 ZINDO CD 计算得到证实。代谢物显示出广泛的抗菌活性。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)