Synthesis and structural studies of oligomers of 6-amino-2,5-anhydro-6-deoxy-d-mannonic acid
作者:T.K Chakraborty、S Jayaprakash、P Srinivasu、M Govardhana Chary、P.V Diwan、R Nagaraj、A Ravi Sankar、A.C Kunwar
DOI:10.1016/s0040-4039(00)01425-8
日期:2000.10
closure by intramolecular opening of a terminal aziridine ring by a γ-hydroxyl group, led to the stereoselective synthesis of 6-amino-2,5-anhydro-6-deoxy-d-mannonic acid (1). Oligomerization of 1 by solution phase peptide coupling methods gave oligomers 2–5. While most of the oligomers, in either protected or deprotected form, did not show any significant secondary structure, octamer 5 (P=H) exhibited
一种新颖的环醚化过程,涉及通过γ-羟基分子通过末端氮丙啶环的分子内开放来轻松实现5 - exo S N 2型闭环,从而立体合成6-氨基-2,5-脱水-6-脱氧-d-甘露糖酸(1)。低聚1通过溶液相肽偶合方法得到的低聚物2 - 5。尽管大多数低聚物(无论是保护形式还是脱保护形式)均未显示任何显着的二级结构,但在MeOH和TFE中,八聚体5(P = H)的CD光谱在216 nm处显示出非常强的正谱带,表明存在解决方案中是否存在有序结构。其1但是,在各种极性溶剂中的1 H NMR谱图未能显示出酰胺质子化学位移的任何明显分散。化合物1 - 5被发现在大鼠降血糖测试无效。