enantiomeric enrichment depend on the structures of the amine and carboxylic acid. Calculated Kagan enantioselectivity parameters (s) are in the range 1.6-195. Chiral triazinylammonium chlorides formed in situ from CDMT and chiral tertiary amines are postulated as reactive intermediates involved in the process of enantioselective activation of N-protected amino acids.
在手性叔胺(例如
士的宁,
马钱子碱和斯巴
丁胺)存在下,通过
2-氯-4,6-二甲氧基-1,3,5-三嗪(
CDMT)将外消旋的N-保护的
氨基酸与
氨基成分偶联对映选择性地得到合适的酰胺或二肽,产率为69-85%。优选的对映异构体和对映异构体富集的构型取决于胺和
羧酸的结构。计算的Kagan对映选择性参数在1.6-195的范围内。由
CDMT和手性叔胺原位形成的手性三嗪基
氯化铵被假定为反应性中间体,参与N保护
氨基酸的对映选择性活化过程。