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 asymmetric synthesis 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
手性四氮杂大环2-(R)-2-(4,7,10-三叔丁基丁基羧甲基-1,4,7,10-四氮杂环十二烷基-1-基)-戊二酸的多克不对称合成方法1 -叔丁基酯(([R )-叔-Bu 4 -DOTAGA,4)已经设计和展示。九步合成法改进了2-(S)-5-氧代四氢呋喃-2-羧酸叔丁酯8的合成,该酯是新型烷基化剂(S)-5-苄基1-叔丁基的前体2-(甲基磺酰氧基)戊二酸酯12,用于以高光学纯度将正交保护的手性谷氨酸臂引入1,4,7,10-四氮杂环十二烷(环)核。环烯衍生物([R )-吨-Bu 4 -DOTAGA,4,一种用于磁共振成像中的用途的关键中间体(MRI)的候选,以高化学(≥95%)和光(EE≥97%)纯度产生。开发的方法成功地应用于的千克规模的cGMP合成(- [R ) -吨-Bu 4 -DOTAGA。