Koumbalones a and b, new casbane diterpenes from maprounea africana

Yoel Kashman; Matthew W. Bernart; Mark TischLer; John H. Cardellina; Michael R. Boyd

doi:10.1021/np50105a020

Koumbalones a and b, new casbane diterpenes from maprounea africana

Yoel Kashman, Matthew W. Bernart^*, Mark TischLer, John H. Cardellina, Michael R. Boyd

^*Corresponding author for this work

National Institutes of Health

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The organic extract of Maprounea africana yielded koumbalones A [1] and B [2], defined by spectral methods as new variations on the casbane ring system. The gross structures, relative configurations, and solution conformations were determined by a combination of spectral analyses and molecular modeling. Because koumbalone A spontaneously converts to koumbalone B at room temperature, koumbalone B may be an artifact of isolation.

Original language	English
Pages (from-to)	426-430
Number of pages	5
Journal	Journal of Natural Products
Volume	57
Issue number	3
DOIs	https://doi.org/10.1021/np50105a020
State	Published - 1 Mar 1994
Externally published	Yes

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abstract = "The organic extract of Maprounea africana yielded koumbalones A [1] and B [2], defined by spectral methods as new variations on the casbane ring system. The gross structures, relative configurations, and solution conformations were determined by a combination of spectral analyses and molecular modeling. Because koumbalone A spontaneously converts to koumbalone B at room temperature, koumbalone B may be an artifact of isolation.",

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AU - Kashman, Yoel

AU - Bernart, Matthew W.

AU - TischLer, Mark

AU - Cardellina, John H.

AU - Boyd, Michael R.

PY - 1994/3/1

Y1 - 1994/3/1

N2 - The organic extract of Maprounea africana yielded koumbalones A [1] and B [2], defined by spectral methods as new variations on the casbane ring system. The gross structures, relative configurations, and solution conformations were determined by a combination of spectral analyses and molecular modeling. Because koumbalone A spontaneously converts to koumbalone B at room temperature, koumbalone B may be an artifact of isolation.

AB - The organic extract of Maprounea africana yielded koumbalones A [1] and B [2], defined by spectral methods as new variations on the casbane ring system. The gross structures, relative configurations, and solution conformations were determined by a combination of spectral analyses and molecular modeling. Because koumbalone A spontaneously converts to koumbalone B at room temperature, koumbalone B may be an artifact of isolation.

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ER -

Koumbalones a and b, new casbane diterpenes from maprounea africana

Abstract

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