Basiliskamide A is an antifungal polyketide natural product isolated by Andersen and co-workers from a Bacillus laterosporus isolate, PNG-276. A nine-step enantioselective synthesis of (-)-basiliskamide A is reported, starting from commercially available beta-hydroxy ester 7. The synthesis features a highly diastereoselective mismatched double asymmetric delta-stannylallylboration reaction of aldehyde 5 with the bifunctional allylborane reagent 4.
Large-scale synthesis, design, and structure-activity relationships of khafrefungin are reported. Khafrefungin is an antifungal agent that inhibitsinositolphosphorylceramide (IPC) synthase, an enzyme involved in fungal sphingolipid biosynthesis. Unlike other inhibitors that inhibit the corresponding enzyme in fungi and mammals to the same extent, khafrefungin does not impair sphingolipid synthesis in mammals
PK with multiple stereogenic centers. The absoluteconfigurations of the stereogenic centers were determined by chemical degradation followed by comparison of the degradation products with synthetic standards. A stereochemical rule was proposed to explain the absoluteconfigurations of other reduced PKs and highlights an error in the absoluteconfigurations of a reported structure. The present work
Rapid and Stereochemically Flexible Synthesis of Polypropionates: Super-Silyl-Governed Aldol Cascades
作者:Patrick B. Brady、Hisashi Yamamoto
DOI:10.1002/anie.201108325
日期:2012.2.20
Polypropionates made EZ: The E/Z geometry of tris(trimethylsilyl)silyl super silyl enol ethers derived from propionaldehyde controls diastereoselectivity in the aldehyde crossed‐aldol reaction. These silyl enol ethers can participate in polyaldol cascade reactions, thus allowing the one‐pot synthesis of four different dipropionate stereotetrads (see scheme), and polyketides bearing up to five contiguous