Nine new cyclodepsipeptides, homophymines BâE (2â5) and A1âE1 (1aâ5a), were isolated from the polar extracts of the sponge Homophymia sp. The new structures, featuring new polyketide-derived end groups, were determined by interpretation of NMR and MS data. The configurations of the new end groups was secured by the application of J-based configurational analysis. Homophymines displayed very potent antiproliferative activity (IC50 in the nM range) against a panel of human cancer cell lines.
Synthesis of All the Diastereomers of 2-Amino-3-hydroxy-4,5-dimethylhexanoic Acid
作者:Jan Spengler、Fernando Albericio
DOI:10.1002/ejoc.201301257
日期:2014.1
Herein, we describe an efficient stereoselective synthesis of all the diastereomers of 2-amino-3-hydroxy-4,5-dimethylhexanoic acid. The γ-branched carbon skeleton was set up by reaction of Garner's aldehyde with 2-lithio-3-methyl-2-butene. Hydrogenation (Pd/C catalyst) of the tetrasubstituted olefin proceeded smoothly with acceptable stereoselectivity, depending on the diastereomer hydrogenated. The
[EN] SYNTHETIC PROCESS FOR THE MANUFACTURE OF PIPECOLIDEPSIN COMPOUNDS<br/>[FR] PROCÉDÉ DE SYNTHÈSE POUR LA FABRICATION DE COMPOSÉS DE PIPÉCOLIDEPSINE
申请人:PHARMA MAR SA
公开号:WO2014108526A1
公开(公告)日:2014-07-17
(I) wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, n and Y are as described. The invention provides a process for the synthesis of complex pipecolidepsin and related compounds of formula (I), opening a new field of compounds with useful biological properties. The invention also provides intermediates, useful in the synthesis of compounds of formula (I).