Chemoenzymatic resolution of epimeric cis 3-carboxycyclopentylglycine derivatives
作者:Chiara Cabrele、Francesca Clerici、Raffaella Gandolfi、Maria Luisa Gelmi、Francesco Molinari、Sara Pellegrino
DOI:10.1016/j.tet.2006.02.006
日期:2006.4
reactions. The synthesis incorporates a concise and inexpensive chemoenzymatic resolution of racemic compounds 4,5a, the N,O-protected derivatives of amino acids 10,11. Systematic screening with different enzymes and microorganisms was performed to select a very efficient catalyst for the separation of the racemic mixtures. The reaction conditions allowing deprotection of both ester and amino functions
通过一系列Diels-Alder反应和Retro-Claisen反应,有效地制备了差向异构的3-羧基环戊基甘氨酸(+)- 10 /(-)- 10和(+)- 11 /(-)- 11。合成结合了简明和外消旋化合物的廉价的化学酶促分辨率4,图5a,所述Ñ,Ó氨基酸-保护的衍生物10,11。用不同的酶和微生物进行系统筛选以选择一种非常有效的催化剂,用于分离外消旋混合物。研究了允许脱保护酯和氨基官能团并避免差向异构化过程的反应条件。以高对映体纯度获得对映体(即,(+)- 10 /(-)- 10和(+)- 11 /(-)- 11)。明确分配了所有立体中心的绝对配置。