Armando Córdova of Stockholm University has found (Tetrahedron Lett. 2008, 49, 4209. DOI: 10.1016/j.tetlet.2008.04.162)that the organocatalyst 3a effected enantioselective conjugate addition of bromonitromethane 2 to the α,β-unsaturated aldehyde 1, to…
Often, 6,6-spiroketals such as Spirofungin A (3) have a strong anomeric bias. Spirofungin A does not, as the epimer favored by double anomeric stabilization suffers from destabilizing steric interactions. Tetrabutylammonium…
Lograft is shown. (D.) CD8+CD122+PD-1+ Tregs isolated from na e B6 mice mainly expressed FasL prior to their adoptive transfer, as determined by flow analyses. One particular of two separate…
The polyene macrolide RK-397 (3), isolated from soil bacteria, has antifungal, antibacterial and anti-tumor activity. Tarek Sammakia of the University of Colorado has described (Angew. 1-Acetoxy-1,2-benziodoxol-3-(1H)-one site Chem. PMID:23546012 Int.…
The pentacyclic alkaloid (+)-lyconadin A (3), isolated from the club moss Lycopodium complanatum, showed modest in vitro cytotoxicity. A key step in the first reported (J. PMID:23805407 Am. Chem. Soc.…
The monoterpene alkaloid (-)-incarvillateine (3) has interesting symmetry properties. The centralcyclobutane diacid core is not itself chiral, but the appended alkaloids are. The key step in the total synthesis of…
The macrolactone leucascandrolide A (4), isolated from the calcareous sponge L. caveolata, has both cytotoxic and antifungal activity. The key step in the synthesis of 4 reported (J. Org. Chem.…
Cruentaren A (3), isolated from the myxobacterium Byssovorax cruenta, is an inhibitor of mitochondrial F-ATPase. The synthesis of 3 (Org. Lett. 2007, 9, 655, DOI: 10.1021/ol0629317; Angew. Chem. Int. Ed.…
Rapamycin (3) is used clinically as an immunosuppressive agent. The synthesis of 3 (Angew. N-(2-Hydroxyethyl)maleimide Data Sheet Chem. Int. PMID:35345980 Morpholin-2-one site Ed. 2007, 46, 591.DOI: 10.1002/anie.200604053)by Steven V. Ley…
(+)-Superstolide A (3), isolated from the New Caledonian sponge Neosiphonia superstes, shows interesting cytotoxicity against malignant cell lines at ~ 4 ng/mL concentration. The key transformation in the synthesis of…
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