Synthesis of Diastereomers of 1,3-<i>cis</i>-25-Dihydroxy-19-norvitamin D<sub>3</sub>
作者:Kosuke Usuda、Tanima Biswas、Takuya Yamaguchi、Yusuke Akagi、Koji Yasui、Motonari Uesugi、Isao Shimizu、Seijiro Hosokawa、Kazuo Nagasawa
DOI:10.1248/cpb.c16-00311
日期:——
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。