The influence of cryptands as phase transfer catalysts (PTC) on the efficiency of aromatic nucleophilic radiofluorination
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Abstract
На примере молекулы 4-метокси-3-нитробензальдегида впервые было изучено влияние двух межфазных катализаторов – криптандов K 2.2.2 и K 2.2.2 BB на эффективность введения метки 18F путем нуклеофильного замещения. Были подобраны условия реакции (ДМФА, 30 минут, 140°C, соотношение субстрат/криптанд ̶ 1/2), при которых оба криптанда показали относительно высокие выходы радиофторирования: 40% и 54% в случае K 2.2.2 и K 2.2.2BB, соответственно. Продукт, 4-метокси-3-[18F]фторбензальдегид может быть использован в качестве меченого интермедиата в синтезе биологически активных макромолекул, потенциальных радиотрейсеров для позитронной эмиссионной томографии (ПЭТ).
For the first time the influence of two phase transfer catalysts – cryptands (K 2.2.2 and K 2.2.2BB) on the nucleophilic radiofluorination efficiency using 4-methoxy-3-nitrobenzaldehyde as a model compound was investigated. Both of them demonstrated relatively high radiofluorination yields (40% for K 2.2.2 and 54% for K 2.2.2BB) under the chosen reaction conditions (DMF, 30 min, 140°C, 1/2 as the substrate/cryptand ratio). The labeled product, 3-[18F]fluoro-4-methoxybenzaldehyde could be used as an intermediate in synthesis of bioactive macromolecules, potential radiotracers for the positron emission tomography (PET).
For the first time the influence of two phase transfer catalysts – cryptands (K 2.2.2 and K 2.2.2BB) on the nucleophilic radiofluorination efficiency using 4-methoxy-3-nitrobenzaldehyde as a model compound was investigated. Both of them demonstrated relatively high radiofluorination yields (40% for K 2.2.2 and 54% for K 2.2.2BB) under the chosen reaction conditions (DMF, 30 min, 140°C, 1/2 as the substrate/cryptand ratio). The labeled product, 3-[18F]fluoro-4-methoxybenzaldehyde could be used as an intermediate in synthesis of bioactive macromolecules, potential radiotracers for the positron emission tomography (PET).