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Structures of perfragilin A and B
S K Rizvi1, M B Hossain, D van der Helm
1Department of Chemistry and Biochemistry, Oklahoma University, Norman 73019.
Acta Crystallographica. Section C, Crystal Structure Communications
|January 15, 1993
Summary
Perfragilins A and B, natural products with an isoquinolinetrione core, exhibit distinct structural properties due to differing substituents. These variations influence molecular planarity and bond geometry, impacting their chemical behavior.
Area of Science:
- Natural Product Chemistry
- Organic Chemistry
- Structural Chemistry
Background:
- Perfragilins are natural products characterized by an isoquinolinetrione skeleton.
- Structural variations at the C(6) and C(7) positions differentiate perfragilin A and B.
Purpose of the Study:
- To elucidate the structural differences between perfragilin A and perfragilin B.
- To investigate the impact of specific substituents on the molecular geometry of perfragilins.
Main Methods:
- Comparative analysis of molecular structures.
- Examination of bond distances and angles using crystallographic data or computational modeling (implied).
Main Results:
- Perfragilin A possesses a thiomethyl group at C(6) and an amide group at C(7).
- Perfragilin B features thiomethyl groups at both C(6) and C(7) positions.
- The amide group in perfragilin A induces planarity in the isoquinoline ring system (r.m.s. deviation 0.026 Å).
- The two thiomethyl groups in perfragilin B result in significant deviations from planarity in the isoquinoline ring system (r.m.s. deviation 0.067 Å).
Conclusions:
- The substitution patterns at C(6) and C(7) critically affect the planarity and geometry of the isoquinolinetrione core in perfragilins.
- Structural differences, particularly the presence of an amide versus a thiomethyl group, lead to distinct molecular conformations.