Synthesis of N-Fmoc-(2S,3S,4R)-3,4-dimethylglutamine: An Application of Lanthanide-Catalyzed Transamidation
摘要:
N-Fmoc-(2S,3S,4R)-3,4-dimethylglutamine (6) was synthesized from tert-butyl N-Boc-(2S,3S,4R)dimethylpyroglutamate (13). This synthesis involved selective deprotection of a Boc group from a lactam nitrogen in the presence of a tert-butyl ester, Fmoc protection of the lactam, and a lanthanidecatalyzed transamidation reaction of the Fmoc-protected lactam, using ammonia and dimethylaluminum chloride. The scope of Lewis acid-catalyzed transamidation of acylated lactams was explored through the variation of lanthanide, lactam, acyl group, amine, and aluminum reagent. The reactivity of various metal triflates was found to vary in the following qualitative order: Yb Sc > Er similar to Eu similar to Sm > Ce similar to Agl > Cu-II similar to Zn. Intriguingly, catalysis was only observed when ammonia was the nitrogen nucleophile; addition of other amidoaluminum complexes to acyl lactams was found to be insensitive to the addition of lanthanides.
[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).