Multifunctional Crown-5-calix[4]arene-based Phase-Transfer Catalysts for Aromatic ¹⁸F-Fluorination

초록

Methylated bis-triethylene glycolic crown-5-calix[4]arene (M-BTC5A) as a phase-transfer catalyst showed the best performance among other analogues and even conventional Kryptofix 222 in the nucleophilic aromatic F-18-fluorination of diaryliodonium tosylate precursors owing to (i) the efficient release of reactive "naked" [F-18]fluoride, (ii) the high stabilization of the precursor in the reaction, and, presumably, (iii) the ease of access between the precursor and the (KF)-F-18/M-BTC5A complex facilitated by p-p interactions. [F-18]Flumazenil was produced in high radiochemical yield using M-BTC5A.

키워드