Optically pure and enriched isomers of chelating ligands and contrast agents
申请人:Amedio C. John
公开号:US20060155120A1
公开(公告)日:2006-07-13
Organic chelating ligands, organic chelating ligand precursors, and metal chelates are disclosed. Methods for synthesizing the same are also described, including methods for preparing optically-enriched or optically-pure compositions of the same.
Development of a Multigram Asymmetric Synthesis of 2-(<i>R</i>)-2-(4,7,10-Tris <i>tert</i>-Butylcarboxymethyl-1,4,7,10-tetraazacyclododec-1-yl)-pentanedioic Acid, 1-<i>tert</i>-Butyl Ester, (<i>R</i>)-<i>tert</i>-Bu<sub>4</sub>-DOTAGA
作者:Stuart G. Levy、Vincent Jacques、Kevin Li Zhou、Shirley Kalogeropoulos、Kelly Schumacher、John C. Amedio、Jonathan E. Scherer、Steven R. Witowski、Richard Lombardy、Karsten Koppetsch
DOI:10.1021/op8002932
日期:2009.5.15
A process for the multigram asymmetricsynthesis of the chiral tetraazamacrocycle 2-(R)-2-(4,7,10-tris tert-butylcarboxymethyl-1,4,7,10-tetraazacyclododec-1-yl)-pentanedioic acid, 1-tert-butyl ester ((R)-tert-Bu4-DOTAGA, 4) has been devised and demonstrated. The nine-step synthesis features an improved synthesis of 2-(S)-5-oxotetrahydrofuran-2-carboxylic acid, tert-butyl ester 8, the precursor to the