Dendrophanes: Novel Steroid-Recognizing Dendritic Receptors. Preliminary Communication
作者:Peter Wallimann、Paul Seiler、Fran�ois Diederich
DOI:10.1002/hlca.19960790320
日期:1996.5.8
for core-selective complexation of testosterone (21) by the dendrophanes 3 (1st), 4 (2nd), and 5 (3rd generation) carrying up to 108 carboxylate surface groups. The stability of the corresponding 1:1 complexes was hardly affected by the size of the dendritic shell, although some generation-dependent conformational changes in the receptor cavity seemed to take place. Remarkably, host-guest exchange
合成,纯化和表征了第一代至第三代的H 2 O可溶性树状环幻烷(dendrophanes)3-5,分子量高达近20 kD。环芳2,它作为引发剂芯(产生零),从制备tetrabromocyclophane 10在其中涉及作为第一转化的高产,四倍的Pd(0)催化的四步骤序列铃木交叉偶联反应用4-(苄氧基)-苯基硼酸得到18。四溴环烷10的X射线晶体结构分析展示了一个开放的,接近矩形的盒子,盒子的相对芳香壁相距8.3和11.4埃,其尺寸适合合并甾体底物。在硼酸盐缓冲的D 2 O / CD 3 OD 1:1中的1 H-NMR结合滴定表明,环烷四羧酸酯2与类固醇形成1:1包合物(表2)。发现络合物是由对非极性底物测得的更高的结合亲和力焓驱动的。在相同溶剂中的1 H-NMR滴定也为树枝状3(1st),4(2nd)和3d (1st)的睾丸酮(21)的核心选择性络合提供了清晰的证据。5(第3代)带有多达10