Spiranoid withanolides from Jaborosa odonelliana |
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| Authors: | Cirigliano Adriana M Veleiro Adriana S Oberti Juan C Burton Gerardo |
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| Institution: | Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria (1428) Buenos Aires, Argentina. |
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| Abstract: | Six new spiranoid withanolides, (20R,22R,23S)-5alpha-chloro-6beta,12beta,17beta,22-tetrahydroxy-1-oxo-12,23-cycloergosta-2,24-dien-26,23-olide (2), (20R,22R,23S)-5beta,6beta-epoxy-12beta,17beta,22-trihydroxy-1-oxo-12,23-cycloergosta-2,24-dien-26,23-olide (3), (20R,22R,23S)-5beta,6beta-epoxy-4beta,12beta,17beta,22-tetrahydroxy-1-oxo-12,23-cycloergosta-2,24-dien-26,23-olide (4), (20R,22R,23S)-5alpha,6beta,12beta,17beta,22-pentahydroxy-1-oxo-12,23-cycloergosta-2,24-dien-26,23-olide (5), (20R,22R,23S)-6beta,12beta,17beta,22-tetrahydroxy-5alpha-methoxy-1-oxo-12,23-cycloergosta-2,24-dien-26,23-olide (6), and (20R,22R,23S)-6beta,12beta,17beta,22-tetrahydroxy-2alpha,5alpha-epidioxy-1-oxo-12,23-cycloergosta-3,24-dien-26,23-olide (7), were isolated from the leaves of Jaborosa odonelliana. Compounds 2-7 were characterized by a combination of spectroscopic methods (1D and 2D NMR, MS) and molecular modeling. |
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