Triply bridged (1,3,5) cyclophanes from cystine and lanthionine linkers—a comparison
作者:S. Ranganathan、P. Venkateshwarlu、S.M. Babu、N.S. Reddy、S.J. Basha、A.V.S. Sarma、D. Vijay、G.N. Sastry
DOI:10.1016/j.tet.2010.03.091
日期:2010.5
with cystine-di-Me [H2N–CH(COOMe)–CH2–S–S–CH2–CH(COOMe)–NH2] yielded triply bridged (1,3,5) cyclophane 1, which was shown by detailed spectral studies and molecular orbital calculations to have a D3 symmetry with conformationally identical linkers and a spherical topology. In sharp contrast, the (1,3,5) cyclophane 2 from the rarely studied lanthionine di-Me [H2N–CH(COOMe)–CH2–S–CH2–CH(COOMe)–NH2], showed
1,3,5-三羰基氯苯与胱氨酸-二甲基[H 2 N–CH(COOMe)–CH 2 –S–S–CH 2 –CH(COOMe)–NH 2 ]的缩合产生三重桥连(1 ,3,5)环烷1,通过详细的光谱研究和分子轨道计算显示,其具有D 3对称性,构象相同的连接子和球形拓扑。与之形成鲜明对比,在(1,3,5)环芳2从研究很少羊毛硫氨酸二-ME [H 2 N-CH(COOMe)-CH 2 -S-CH 2 -CH(COOMe)-NH 2,仅显示出赤道双重对称。这项工作强调了胱氨酸中–S–S–桥的特殊性质,这使其成为自然界和有机合成中的杰出合成子。