A practical route for the stereoselective synthesis of (2S,3S)-5,5,5-trifluoroisoleucine (L-5-F3Ile) and (2R,3S)-5,5,5-trifluoro-allo-isoleucine (D-5-F3-allo-Ile) was developed. The hydrophobicity of L-5-F3Ile was examined and it was incorporated into a model peptide via solid phase peptide synthesis to determine its α-helix propensity. The α-helix propensity of 5-F3Ile is significantly lower than Ile, but surprisingly high when compared with 4’-F3Ile.
开发了一种立体选择性合成(2S,3S)-5,5,5-三氟异亮氨酸(L-5-F3Ile)和(2R,3S)-5,5,5-三氟-异亮氨酸(D-5-F3-allo-Ile)的实用路线。检查了L-5-F3Ile的亲水性,并通过固相肽合成将其并入模型肽中,以确定其α-螺旋倾向性。与Ile相比,5-F3Ile的α-螺旋倾向性显著降低,但与4'-F3Ile相比则令人惊讶地高。