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Assignment of 13C-nmr spectrum and biosynthesis of colletotrichin

✍ Scribed by Yasuo Kimura; Masatoshi Gohbara; Akinori Suzuki

Publisher: Elsevier Science
Year: 1977
Tongue: French
Weight: 223 KB
Volume: 18
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)83583-8

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✦ Synopsis

Colletotrichin (I) is a phytotoxic substance isolated from CoZZetotrichwn nicotianae 1) C. capsi'), and and the structure has been independently determined by X-ray analysis of itself 1) and its acetate3). In addition to I, we isolated two closely related compounds, colletotrichins B (II) and C (III)4)from C. nicotianue and established the structures. The structural features of colletotrichins consisting ofanomalousnorditerpene and polysubstituted y-pyrone moieties have stimulated us to study the biosynthesis of colletotrichins. Here we wish to report the assignment of 13 C-nmr spectra of colletotrichins and biosynthesis of I in C. nicotianae from 13C-formate, 1-13C-, 2-13C-and 1,2-13C-acetate. The chemical shifts and multiplicities of off-resonance decoupled spectra of I, II and III along with IV5) are shown in Table 1.

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