min D3 (4b) were synthesized by employing a new A-ring synthon, (1R,3S)-3-((tert-butyldimethylsilyl)oxy)-5-oxocyclohexyl benzoate (19), which was derived from D-(-)-quinic acid in 12 steps. The A-ring was coupled with the circular dichroism (CD) ring by means of Julia-Kocienski olefination to construct the diene unit. The structures of the products were confirmed by (1)H-NMR and nuclear Overhauser
通过使用新的A环合成子(1R,3S)-3-合成1beta,3beta,25-dihydroxy-19-norvitamin D3(4a)和1alpha,3alpha,25-dihydroxy-19-norvitamin D3(4b) ((叔丁基二甲基甲
硅烷基)氧基)-5-氧代
环己基苯甲酸酯(19),由D-(-)-
奎尼酸经12个步骤衍生而来。通过Julia-Kocienski烯化反应将A环与圆二色性(CD)环偶联,以构建二烯单元。产物的结构通过(1)H-NMR和核Overhauser效应(NOE)实验证实。