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A Pair of Novel Heptentriol Stereoisomers from the Ascomycete Daldinia concentrica

✍ Scribed by Fei Wang; Ji-Kai Liu

Publisher
John Wiley and Sons
Year
2004
Tongue
German
Weight
71 KB
Volume
87
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

A pair of novel heptentriol stereoisomers, hept‐6‐ene‐2,4,5‐triols 2 and 3, were isolated from the culture broth of the ascomycete Daldinia concentrica (Bolton : Fries) Cesati & De Notaris, besides three known compounds, i.e., 2,3‐dihydro‐5‐hydroxy‐2‐methyl‐4__H__‐1‐benzopyran‐4‐one (1), 3,5‐dihydroxy‐2‐(1‐oxobutyl)‐cyclohex‐2‐en‐1‐one (4), and pyroglutamic acid (=5‐oxo‐L‐proline; 5). Their structures were determined by spectroscopic means, including 2D‐NMR (HMQC, HMBC, ^1^H,^1^H‐COSY).

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Prescnted in part by A.G. at the 'Giornate di Chimica delle Sostanze Natural? meeting, Maratea (Potenza), on June 3, 1991. For all compounds discussed here, systematic numbering is only used for retrieval purposes (see Exper. Part and Summary); all experimental data are given in terms of the arbitra