Synthesis of New Amino Acids with a 5-Imino-2,5-dihydro-3-furanyl Substituent at the Amino Group
作者:Boris Trofimov、Anastasiya Mal’kina、Olesya Shemyakina、Angela Borisova、Valentina Nosyreva、Oleg Dyachenko、Olga Kazheva、Gennadii Alexandrov
DOI:10.1055/s-2007-983819
日期:2007.9
Amino acids (glycine, β-alanine, γ-aminobutyric and ε-aminocapronic acids, d,l-valine, and d,l-leucine) react under biomimetic conditions (H2O, NaOH, pH Ë8.6-9.9, room temperature) smoothly with α,β-acetylenic γ-hydroxyacid nitriles to give a novel family of unnatural amino acids containing a 5-imino-2,5-dihydro-3-furanyl substituent at the amino group, in 61-98% yield. As follows from a single-crystal X-ray analysis of 2-[(5-imino-2,2-dimethyl-2,5-dihydro-3-furanyl)amino]acetic acid, the synthesized amino acids are zwitterions with a protonated imino group in the iminodihydrofuran moiety.
氨基酸(甘氨酸、β-丙氨酸、γ-氨基丁酸、ε-氨基己酸、d,l-缬氨酸和d,l-亮氨酸)在仿生条件下(H2O、NaOH、pH ≈8.6-9.9、室温)平稳地与α,β-炔基γ-羟基酸腈反应,以61-98%的产率生成一类含有氨基的5-亚胺基-2,5-二氢-3-呋喃基取代基的新型非天然氨基酸。从2-[(5-亚胺基-2,2-二甲基-2,5-二氢-3-呋喃基)氨基]乙酸的单晶X射线分析可以看出,合成的氨基酸是含有亚胺双氢呋喃部分质子化亚胺基的偶极离子。