The reference standards methyl 3-((2,2-difluoro-5H-[1,3]dioxolo[4′,5′:4,5]benzo[1,2-d]imidazol-6-yl)carbamoyl)benzoate (5a) and N-(2,2-difluoro-5H-[1,3]dioxolo[4′,5′:4,5]benzo[1,2-d]imidazol-6-yl)-3-methoxybenzamide (5c), and their corresponding desmethylated precursors 3-((2,2-difluoro-5H-[1,3]dioxolo[4′,5′:4,5]benzo[1,2-d]imidazol-6-yl)carbamoyl)benzoic acid (6a) and N-(2,2-difluoro-5H-[1,3]dioxolo[4′,5′:4,5]benzo[1,2-d]imidazol-6-yl)-3-hydroxybenzamide (6b), were synthesized from 5-amino-2,2-difluoro-1,3-benzodioxole and 3-substituted benzoic acids in 5 and 6 steps with 33% and 11%, 30% and 7% overall chemical yield, respectively. Carbon-11-labeled casein kinase 1 (CK1) inhibitors, [¹¹C]methyl 3-((2,2-difluoro-5H-[1,3]dioxolo[4′,5′:4,5]benzo[1,2-d]imidazol-6-yl)carbamoyl)benzoate ([¹¹C]5a) and N-(2,2-difluoro-5H-[1,3]dioxolo[4′,5′:4,5]benzo[1,2-d]imidazol-6-yl)-3-[¹¹C]methoxybenzamide ([¹¹C]5c), were prepared from their O-desmethylated precursor 6a or 6b with [¹¹C]CH₃OTf through O-[¹¹C]methylation and isolated by HPLC combined with SPE in 40–45% radiochemical yield, based on [¹¹C]CO₂ and decay corrected to end of bombardment (EOB). The radiochemical purity was >99%, and the molar activity (MA) at EOB was 370–740 GBq/μmol with a total synthesis time of ∼40-min from EOB.

参考标准品甲基3-（（（2,2-二氟-5 H- [1,3] dioxolo [4'，5'：4,5]苯并[1,2 - d ]咪唑-6-基）氨基甲酰基）苯甲酸酯（5a）和N-（2,2-difluoro-5 H- [1,3] dioxolo [4'，5'：4,5]苯并[1,2- d ]咪唑-6-基）-3 -甲氧基苯甲酰胺（5c）及其相应的脱甲基前体3-（（2,2-二氟-5 H- [1,3] dioxolo [4'，5'：4,5]苯并[1,2- d ]咪唑-6-基）氨基甲酰基）苯甲酸（6a）和N-（2,2-二氟-5 H- [1,3] dioxolo [4'，5'：4,5]苯并[1,2- d ]咪唑-6-基）-3-羟基苯甲酰胺（6b）由5-氨基-2,2-二氟-1,3-苯并二恶唑和3-取代的苯甲酸分5步和6步合成，总化学收率分别为33％和11％，30％和7％。碳11标记的酪蛋白激酶1（CK1）抑制剂，[ ¹¹ C]甲基3-（（（2,2-二氟-5 H- [1,3] dioxolo [4'，5'：4,5]苯并[ 1,2 - d ]咪唑-6-基）氨基甲酰基）苯甲酸酯（[ ¹¹ C] 5a）和N-（2,2-difluoro-5 H- [1,3] dioxolo [4'，5'：4， 5]苯并[1,2 - d ]咪唑-6-基）-3- [ ¹¹ C]甲氧基苯甲酰胺（[ ¹¹ C] 5c）是由其O-去甲基化的前体6a或6b具有[ ¹¹ C] CH ₃ OTf通过O- [ ¹¹ C]甲基化，并通过HPLC与SPE分离，基于[ ¹¹ C] CO _2的放射化学产率为40-45％，并衰减至轰击结束（EOB） 。放射化学纯度> 99％，在EOB处的摩尔活度（MA）为370–740 GBq /μmol，从EOB的总合成时间约为40分钟。