A stereoselective synthesis of thymine polyoxin C 3 is described in which the key step is the [3,3] sigmatropic rearrangement of the trifluoroacetimidate 12 to the trifluoroacetamide 13. Exchange of the protecting groups followed by ozonolysis and further oxidation then gave the methyl ester 20 which was converted into thymine polyoxin C 3 by introduction of the pyrimidine followed by final deprotection.
本文描述了胸腺
嘧啶多氧素C 3的手性选择性合成方法,其中关键步骤是三
氟乙
酰亚胺12的[3,3]σ迁移重排转变为三
氟乙酰胺13。通过保护基团的交换、
臭氧分解和进一步氧化,得到了甲酯20,随后通过引入
嘧啶并最终脱保护,将其转化为胸腺
嘧啶多氧素C 3。