Calix[4]arene Amino Acid Derivatives. Intra- and Intermolecular Hydrogen-Bonded Organisation in Solution and the Solid State
作者:Leo Frkanec、Aleksandar Višnjevac、Biserka Kojić-Prodić、Mladen Žinić
DOI:10.1002/(sici)1521-3765(20000204)6:3<442::aid-chem442>3.0.co;2-1
日期:2000.2.4
extraction/transport properties of 1 and 2 toward metal cations. Calix[4]arene derivatives with one OCH2COPhgOMe strand (3), two OCH2COPhgOMe strands (5) and with 1,3-OMe-2,4-(O-CH2COPhgOMe) substituents (4) at the lower rim have also been prepared. For 3, a conformation stabilised by a circular hydrogen-bond arrangement is found in chloroform, while 4 exists as a time-averaged C2 conformation with two intramolecular
已经合成了具有四个O-(N-乙酰基-PhgOMe),(1),(Phg表示R-苯基甘氨酸)或O-(N-乙酰基-LeuOMe)(2)链的手性杯[4]芳烃衍生物。两种化合物均以稳定的锥形构型存在于氯仿中,并在下部边缘具有非共价组织的空腔,该空腔是由环状链间酰胺氢键形成的。这种组织影响1和2对金属阳离子的选择性和提取/传输性质。还制备了带有一个OCH2COPhgOMe链(3),两个OCH2COPhgOMe链(5)和在下边缘带有1,3-OMe-2,4-(O-CH2COPhgOMe)取代基(4)的杯[4]芳烃衍生物。对于3,在氯仿中发现通过圆形氢键排列稳定的构象,而4以具有两个分子内NH ... OCH3氢键的时间平均C2构象存在。化合物5在溶液中和处于固态时具有独特的氢键基序,在下部边缘具有两个三中心的NH-.O和两个OH ... O氢键。该基序在氯仿中将5保持在平展的圆锥构象中。对1的X射线结构分