手性环状α,α-二取代氨基酸,(3 S,4 S)-和(3 R,4 R)-1-氨基-3,4-(二烷氧基)环戊烷羧酸((S,S)-和(R,R)-Ac 5 c dOR ; R:甲基,甲氧基甲基)是由二甲基L -(+)-或D -(-)-酒石酸酯合成的,它们的同手性均聚物通过溶液相法制备。(S,S)-Ac 5 c dOMe六肽的首选二级结构是左手(M)310螺旋,而(S,S)-Ac 5 c dOMe八肽和十肽的螺旋都是左旋(M)α螺旋,无论是在溶液状态还是在晶体状态。与在2,2,2-三氟乙醇溶液中相比,八肽和十肽可以很好地溶解在纯水中,并且在水中的α螺旋更多。(S,S)-Ac 5 c dOMe同手性同系肽的左旋(M)螺旋仅受侧链手性中心控制,因为环状氨基酸(S,S)-Ac 5 c dOMe 没有α-碳手性中心,但有侧链γ-碳手性中心。
Diastereomeric host-guest complex formation by an optically active paracyclophane in water
作者:Ichiro Takahashi、Kazunori Odashima、Kenji Koga
DOI:10.1016/s0040-4039(01)80077-0
日期:1984.1
The first synthesis of a water-soluble cyclophane possessing a chiral hydrophobic cavity, and the formation of diastereomeric inclusion complexes with chiral hydrophobic guests in water are described.
Studies on Water-soluble Artificial Receptors Containing Chiral Side Chains Derived from Carbohydrates. 1. Synthesis of Optically ActiveCyclophane TCP44 and Its Complexation Selectivity for Aromatic Guests in Acidic Aqueous Solutions
作者:Kazunori Odashima、Ichiro Takahashi、Yuuki Hirano、Hiroshi Arakawa、Hidehiko Kitajima、Minoru Hatanaka、Kimio Isa、Kenji Koga