Convenient Synthesis of 1<i>α</i>,25-Dihydroxyvitamin D<sub>3</sub>from Vitamin D<sub>2</sub>
作者:Minokazu Takahashi、Yasumasa Sakakibara
DOI:10.1246/bcsj.67.2494
日期:1994.9
(1S,6R)-1-Acetoxy-6-(1,3-benzodithiol-2-yloxy)-3,5-cyclovitamin D2 (7) was synthesized from vitamin D2 by five steps. The new compound 7 was ozonized regioselectively and subsequently reduced, leading to (7E)-(1S,3S,5R,6R)-1-acetoxy-6-(1,3-benzodithiol-2-yloxy)-3,5-cyclo-9,10-seco-23,24-dinor-7,10(19)-choladien-22-ol (11). The alcohol 11 obtained as a key intermediate was tosylated, iodinated, and coupled with 2-methyl-4-phenylsulfonyl-2-(tetrahydropyranyloxy)butane to give (1S,6R)-1-hydroxy-6-(1,3-benzodithiol-2-yloxy)-23-phenylsulfonyl-25-tetrahydropyranyloxy-3,5-cyclovitamin D3 (16). By desulfonylation and hydrolysis of the compound 16 1α,25-dihydoxyvitamin D3 was obtained selectively.
(1S,6R)-1-乙酰氧基-6-(1,3-苯并二硫醇-2-氧基)-3,5-环维生素D2 (7) 通过五个步骤从维生素D2合成而来。新化合物7被臭氧选择性地氧化,随后被还原,生成(7E)-(1S,3S,5R,6R)-1-乙酰氧基-6-(1,3-苯并二硫醇-2-氧基)-3,5-环-9,10-开环-23,24-二去甲-7,10(19)-胆甾二烯-22-醇 (11)。作为关键中间体的醇11被对甲苯磺化、碘化,并与2-甲基-4-苯磺酰基-2-(