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Total syntheses of the natural products kelsoene and preussin are comprehensively reviewed. Kelsoene is a sesquiterpene with a unique tricyclo[6.2.0.02,6]decane skeleton. It contains six stereogenic centers the selective construction of which has been addressed differently in the five syntheses known to date. Three syntheses employ an intermolecular [2+2]-photocycloaddition reaction as key step. One...
Pharmaceutical support for spontaneous stone expulsion therapy or fragment clearance after shock wave lithotripsy (SWL) is standard of care in the daily urologic routine. Besides tamsulosin and calcium-channel antagonists, biological products such as terpen combinations are suggested as promoters of stone expulsion.To summarize the literature on terpen combinations in the pharmaceutical treatment...
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