The sorbicillinoids are a family of hexaketide metabolites that have been isolated from a variety of fungal sources, collected from both marine and terrestrial sources. Since 1948, the family has grown in size to include over 50 members, many of which have complex, highly oxygenated, bicyclic and tricyclic frameworks. In conjunction with their biological activity, the structural complexity of these structures has inspired several synthetic campaigns and has also led to controversy surrounding the biosynthetic pathway responsible for the natural production of these compounds. Through this review, we aim to give a historical perspective to each of these areas and hope to inspire new avenues of research for addressing the knowledge gaps that still exist.
An effective way of addressing the
need for an improved culture
of safety in research-intensive science departments is described,
which involves enabling leadership by graduate student and postdoctoral
associate laboratory safety officers (LSOs). In partnership with The
Dow
Chemical Company, LSOs from
the Departments of Chemistry and Chemical Engineering and Materials
Science at the University of Minnesota formed a Joint Safety Team.
With helpful input from Dow, the team has played a key role in improving
the culture and practice of safety in both departments, providing
support for use of this model for inculcating safety as a core value
and an integral part of academic life.
Molecular modelling of an iodine(III) phenoxide was used as a starting point in the design of chiral aryl iodide catalysts for stereoselective oxidative dearomatization reactions. Using this approach, catalysts derived from 8-iodotetralone and tartaric acid were constructed and used to synthesize enantioenriched para-quinols from phenols.
The cyclization of 2,5-cyclohexadienones tethered to activated methylene groups was studied. The substitution around the cyclohexadienone ring serves to regioselectively direct these cyclizations based primarily on electronic effects. In the case of brominated substrates, these reactions proceed to give highly unusual electron-deficient tricyclic cyclopropanes. By using a Cinchona alkaloid-based phase-transfer catalyst, prochiral cyclohexadienones can be desymmetrized with moderate stereoselectivity.
A concise (12 step) total synthesis of sorbicillactone A and 9-epi-sorbicillactone A is reported. Unlike typical routes to the sorbicillinoids, this strategy does not start from sorbicillin and allows for the production of the bicyclic core on a multigram scale. The intramolecular conjugate addition of a tethered malonate serves as an effective means of introducing the lactone ring and provides a synthetic handle for installing the amide nitrogen.
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