Enzymatic Preparation of an <i>R</i>-Amino Acid Intermediate for a γ-Secretase Inhibitor
作者:Ronald L. Hanson、Robert M. Johnston、Steven L. Goldberg、William L. Parker、Animesh Goswami
DOI:10.1021/op400013e
日期:2013.4.19
(BMS-708163) under development, was initially prepared from the corresponding keto acid using a commercially available d-amino acid dehydrogenase for reductive amination and glucose dehydrogenase for cofactor recycling. This amino acid could also be prepared using a d-amino acid transaminase with alanine as the amino donor, but the transamination also requires lactate dehydrogenase, NAD, formate, and
(R)-5,5,5-三氟正缬氨酸,一种正在开发中的γ-分泌酶抑制剂(BMS-708163)的中间体,最初是使用相应的酮酸使用可商购的d-氨基酸脱氢酶进行还原胺化和葡萄糖制备的脱氢酶用于辅因子回收。该氨基酸也可以使用以丙氨酸为氨基供体的d-氨基酸转氨酶来制备,但是该转氨作用还需要乳酸脱氢酶,NAD,甲酸和甲酸脱氢酶以除去丙酮酸以使反应完成。一种有效的专有d-氨基酸脱氢酶是通过对d-二氨基庚二酸脱氢酶基因进行修饰而构建的。球形芽孢杆菌,和葡萄糖脱氢酶基因克隆氧化葡糖杆菌。两种基因均在同一大肠杆菌中表达,且谷氨酸脱氢酶基因在表达菌株中失活,以消除S-氨基酸的背景产生并将产物的ee提高至100%。可以分离氨基酸,也可以将其不分离地转化为对γ-分泌酶抑制剂开发候选物的合成途径所需的对氯苯基磺酰胺羧酰胺中间体。