Microwave-assisted synthesis of 1,3-dialkyl ethers of calix[4]arenes: application to the synthesis of cesium selective calix[4]crown-6 ionophores
作者:Sandip K. Nayak、Manoj K. Choudhary
DOI:10.1016/j.tetlet.2011.10.142
日期:2012.1
phenolic-OH groups of calix[4]arenes with various alkyl halides/tosylates and K2CO3 under microwave irradiation afforded 1,3-dialkoxycalix[4]arenes in their cone conformation only as predominant/sole product in good yields (71–85%). The protocol was found to be much superior to conventional heating both in terms of yield and reaction time. Some of the 1,3-dialkoxycalix[4]arenes were elaborated further
微波辐射下杯[4]芳烃的苯酚-OH基与各种烷基卤化物/甲苯磺酸酯和K 2 CO 3的部分醚化,仅以主要/单一产物的形式提供1,3-二烷氧基杯[4]芳烃,其圆锥构象仅为高收率(71–85%)。发现该方案在产率和反应时间方面均比常规加热好得多。一些1,3-二烷氧基杯[4]芳烃被进一步精制为铯选择性杯[4]冠6离子载体的合成。
Microwave-assisted Alkylation of p-tert-butylcalix[4]arene Lower Rim: The Effect of Alkyl Halides
作者:Vladimir A. Burilov、Ramil I. Nugmanov、Regina R. Ibragimova、Svetlana E. Solovieva、Igor S. Antipin、Alexander I. Konovalov
DOI:10.1016/j.mencom.2013.03.022
日期:2013.3
Alkylation of p-tert-butylcalix[4]arenes with alkyl bromides or iodides under microwave irradiation affords mostly the corresponding distal disubstituted ethers, whereas in case of alkyl chlorides reasonable yields of monoethers were achieved.
Monosodium salt of p-tert-butylcalix[4]arene in the reactions with electrophilic reagents. Synthesis and structure of monofunctionalized calix[4]arenes
作者:Olexander A. Yesypenko、Vyacheslav I. Boyko、Mariia A. Klyachina、Svitlana V. Shishkina、Oleg V. Shishkin、Volodymyr V. Pyrozhenko、Ivan F. Tsymbal、Vitaly I. Kalchenko
DOI:10.1007/s10847-012-0109-9
日期:2012.12
with alkyl halides or aroyl chlorides in DMF formed the cone-shaped monoalkyloxycalix[4]arenes or 1,3-diacyloxycalix[4]arenes, respectively. Diacyloxycalix[4]arenes are easily transformed into monoacyloxycalix[4]arenes in the partial cone conformation by interaction with NaOMe. The influence of intramolecular hydrogen bonding on course of alkylation and acylationreactions as well as the structure of