<sup>13</sup>C-NMR Spectra and Streochemistry of Isoechinulins A, B and C

NAGASAWA Hiromichi, ISOGAI Akira, SUZUKI Akinori, TAMURA Saburo

doi:10.1080/00021369.1979.10863681

<sup>13</sup>C-NMR Spectra and Streochemistry of Isoechinulins A, B and C

DOI DOI オープンアクセス

NAGASAWA Hiromichi

Department of Agricultural Chemistry, The University of Tokyo
ISOGAI Akira

Department of Agricultural Chemistry, The University of Tokyo
SUZUKI Akinori

Department of Agricultural Chemistry, The University of Tokyo
TAMURA Saburo

Department of Agricultural Chemistry, The University of Tokyo

書誌事項

タイトル別名

13C-NMR spectra and streochemistry of isoechinulins A, B and C.

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説明

¹³C-NMR spectra of isoechinulins A, B and C, metabolites from Aspergillus Tuber, were fully assigned on the basis of chemical shifts and multiplicities and comparison with their analogues. Taking advantage of the symmetrical structure of the diketopiperazine ring, the stereochemistry of the trisubstituted carbon-carbon double bond in a dehydrotryptophyl moiety was determined as Z (cis) by measuring the coupling constants, J_-HC=C-CO_-, in the proton nondecoupled spectrum of isoechinulin B.