The present invention involves a rapid synthesis of .sup.18 F-FMISO and analogs thereof. New precursors such as 1-(2'-nitro-1'-imidazolyl)-2-0-acetyl-3-0-tosylpropanol, glycerol-1,3-ditosylate-2-0-acetylate, 1-(2'-nitro-1'-imidazolyl)-2,3-0-diacetylate, are also important aspects of the invention. A further aspect of the invention is the development of a hydrophilic PET ligand to image tumor hypoxia. Erythrotosyl analogue of 2-nitroimidazone (Ts-ETNIM) was prepared from a mixture of 2-nitromidazole, ditosylthreitol and cesium carbonate at 60.degree. C. for 1 hr. Ts-ETNIM was isolated at 70% yield. \x9b.sup.18 F!fluoroerythronitroimidazole (FETNIM) when prepared from Ts-ETNIM and K.sup.18 F/kryptofix.RTM.. The yield for \x9b.sup.18 F!FETNIM was 26-30% (60 min, decay corrected). Results of biodistribution and PET studies indicate that \x9b.sup.18 F!FETNIM has the potential to detect tumor hypoxia and is indicated to be less neurotoxic.
本发明涉及一种快速合成.sup.18 F-
FMISO及其类似物的方法。新的前体物,如1-(2'-硝基-1'-
咪唑基)-2-0-乙酰基-3-0-对
甲苯磺酰基
丙醇、
甘油-1,3-二对
甲苯磺酰酸酯-2-0-乙酰酸酯、1-(2'-硝基-1'-
咪唑基)-2,3-0-
二乙酰酸酯等也是本发明的重要方面。本发明的另一个方面是开发一种亲
水性PET
配体来成像肿瘤低氧。从
2-硝基咪唑、二
对甲苯基三
硫醇和
碳酸铯的混合物在60℃下反应1小时,制备了
2-硝基咪唑的红色糖基类似物(Ts-ETNIM),收率为70%。当从Ts-ETNIM和K.sup.18 F/kryptofix.RTM.制备\x9b.sup.18 F!
氟代红色硝基
咪唑(FETNIM)时,\x9b.sup.18 F!FETNIM的产率为26-30%(60分钟,衰变校正)。
生物分布和PET研究的结果表明,\x9b.sup.18 F!FETNIM具有检测肿瘤低氧的潜力,并且被认为具有较小的神经毒性。