Asymmetric addition of (triisopropylsilyl)acetylene to α,β,γ,δ-unsaturated carbonyl compounds took place in the presence of a cobalt/Duphos catalyst to give the 1,6-addition products in high yields with high regio- and enantioselectivity.
The Synthesis of Two Furan-Based Analogues of theα′,β′-Epoxy Ketone Proteasome Inhibitor Eponemycin
作者:Bibia Bennacer、Dominique Trubuil、Christian Rivalle、David S. Grierson
DOI:10.1002/ejoc.200300400
日期:2003.12
Myers’s methodology for enantioselective amino acid synthesis was employed to prepare the N-Boc didehydroleucine amide derivative 15 and to effect its conversion into the acylfuran intermediate 17. Coupling of 19 (R = H) with N-(isooctanoyl)serine provided the furan-basedanalogue 4 of eponemycin (de = 96 %), a peptide epoxide with potent cytotoxic and anti-angiogenesis properties. In an identical
Synthesis and Preliminary Biological Characterization of New Semisynthetic Derivatives of Ramoplanin
作者:Romeo Ciabatti、Sonia I. Maffioli、Gianbattista Panzone、Augusto Canavesi、Elena Michelucci、Paolo S. Tiseni、Ettore Marzorati、Anna Checchia、Matteo Giannone、Daniela Jabes、Gabriella Romanò、Cristina Brunati、Gianpaolo Candiani、Franca Castiglione
DOI:10.1021/jm070042z
日期:2007.6.1
of the new ramoplanin derivatives showed antimicrobial activity similar to that of the natural precursor coupled with a significantly improved local tolerability. Among them the derivative in which the 2-methylphenylacetic acid has replaced the di-unsaturated fatty acid side chain (48) was selected as the most interesting compound and submitted to further in vitro and in vivo characterization studies