Thiacalix[4]arenes bearing two or four carboxylic functions on the lower rim served as starting compounds for the synthesis of novel calixarene oligomers connected by amidic functions. The cone conformers react smoothly with four molecules of 5-amino-calix[4]arene to yield the corresponding pentakis-calixarenes. On the other hand, because steric hindrance, the 1,3-alternate condenses only with two
New bifunctional compounds obtained by selective hydrolysis of tetrathiacalix[4]arene tetraethyl esters with Cs2CO3
作者:Sergey N. Podyachev、Svetlana N. Sudakova、Bulat M. Gabidullin、Victor V. Syakaev、Aidar T. Gubaidullin、Wim Dehaen、Alexander I. Konovalov
DOI:10.1016/j.tetlet.2012.04.041
日期:2012.6
new strategy for the synthesis of bifunctional compounds, based on 1,3-alternate tetrathiacalix[4]arene precursors functionalized by pairs of carboxylic acid and ester groups located on opposite sides of the macrocycle platform is described. These buildingblocks were prepared by the Cs2CO3 induced selective hydrolysis of tetrathiacalix[4]arene tetraester derivatives. A mechanism for the selective hydrolysis
对于双官能化合物的合成的新策略,基于1,3 -备用tetrathiacalix [4]通过对羧酸和位于大环平台的相对侧上的酯基团的官能化芳烃前体进行说明。这些结构单元是由Cs 2 CO 3诱导的四硫杂杯[4]芳烃四酯衍生物的选择性水解制备的。建议了选择性水解的机制。通过NMR光谱分析和X射线单晶衍射阐明了化合物的结构。