作者:Viola Groehn、Rudolf Moser、Tobias Ross、Thomas Betzel、Cristina Müller、Roger Schibli、Simon Ametamey
DOI:10.1055/s-0030-1260247
日期:2011.11
regiospecific synthesis of N ²-(N,N-dimethylaminomethylene)-2′-nitrofolic acid di-tert-butyl ester (13) and N ²-(N,N-dimethylaminomethylene)-N ¹0-formyl-2′-nitrofolic acid dimethyl ester (25), which are precursors for the radiolabeling of folic acid with the PET isotope ¹8F. A modular synthetic strategy was applied: Fmoc- and Boc-protected 4-amino-2-nitrobenzoic acid were linked via amide bonds to di-tert-butyl
放射性标记的叶酸衍生物具有通过正电子发射断层扫描(PET)和单光子发射计算机断层扫描(SPECT)靶向叶酸盐受体阳性肿瘤细胞进行无创诊断的潜力。我们报告的区域专一性合成ñ ² - (Ñ,Ñ -dimethylaminomethylene)-2'- nitrofolic酸二-叔丁基酯(13)和ñ ² - (Ñ,Ñ -dimethylaminomethylene) - ñ ¹0甲酰基-2' -硝基叶酸二甲酯(25),它们是用PET同位素1 8放射性标记叶酸的前体F.一种模块化的合成策略应用于:的Fmoc-和Boc-保护的4-氨基-2-硝基苯甲酸通过酰胺键以二-联叔丁基升谷氨酸盐和二甲基升-谷氨酸,分别以形成积木10和19。除去Fmoc和Boc后,将两种化合物都与6-(溴甲基)蝶呤氢溴酸盐偶联,得到粗制的2'-硝基叶酸二叔丁酯和2'-硝基叶酸二甲酯。在N个2'- nitrofolic酸二甲酯甲酰化后¹0和引入一个的Ñ,Ñ