Preparative Resolution of Heterocyclic Acetals Derived from Glycine, Mercapto-acetic Acid, ?-Alanine, and Formyl- or Acetylacetic Acid by Recycling Chromatography onChiraspher and Temperature Dependence of Separation Factors
作者:Joachim N. Kinkel、Urs Gysel、Denis Blaser、Dieter Seebach
DOI:10.1002/hlca.19910740803
日期:1991.12.11
gel, is used for the preparative separation by recycling chromatography of the enantiomers of oxazolidinones rac-5, thioxolanone rac-6, per-hydropyrimidinone rac-7, and dioxinones rac-9 and 10 derived from the acids listed in the title (Figs. 1–5). The oxazolidinones rac-1a, -2, and -4 show a peculiar peak of the separation efficiences upon lowering the Chiraspher-column temperature to 15° (Fig. 6). In
Chiraspher,乙基的聚合物Ñ上球形硅胶-acryloylphenylalanine,是通过回收恶唑烷酮的对映体的色谱法用于制备分离外消旋- 5,thioxolanone外消旋- 6,每hydropyrimidinone外消旋- 7,和dioxinones外消旋- 9和10从在标题(列出的酸衍生的图。1 - 5)。恶唑烷酮rac - 1a,-2和-4在降低显示分离efficiences的特有峰Chiraspher -column温度至15°(图。6)。在某些情况下,因此可以制备数克量的对映体纯的杂环。分配了大多数对映异构体的绝对构型。所述的第一应用叔丁基-5-氧代-2-苯基唑烷-3-羧酸乙酯(5),其为亲核手性甘氨酸积木描述(制品13 - 16,方案2)。列出了对映体纯的1,3-二恶英酮(表1),表明它们的绝对构型,旋光度和在Chiraspher上的洗脱行为之间具有相关性。