Synthesis of (22R)- and (22S)-22,25-dihydroxyvitamin D3 and determination of their biological activity.
作者:YUTAKA HIRANO、NOBUO IKEKAWA、YOKO TANAKA、HECTOR F. DELUCA
DOI:10.1248/cpb.29.2254
日期:——
Bisnorcholenal 3-tetrahydropyranyl ether (1), obtained from bisnorcholenic acid in 3 steps, was coupled with lithium acetylide derived from 2-methyl-3-butyn-2-ol tetrahydropyranyl ether to give in 74% yield a 1 : 1 mixture of the cholest-5-ene-3β, 22, 25-trihydroxy-23-yne 3, 25-bis (tetrahydropyranyl) ethers, 2a and 2b. After resolution of the C-22 epimers and determination of their conflgurations, both isomers were converted to 22, 25-dihydroxycholesterol 3, 22-diacetates, 5a and 5b, and to 25-hydroxy-22-methoxycholesterol 3-acetate, 8a and 8b. These compounds were converted to (22R)-and (22S)-22, 25-dihydroxyvitamin D3, 12a and 12b, and to 25-hydroxy-22-methoxyvitamin D3, 14a and 14b, through the corresponding cholest-5, 7-diene-3β, 22, 25-triol 3, 22-diacetates (9a and 9b) and cholest-5, 7-diene-22-methoxy-3β, 25-diol 3-acetates (10a and 10b). According to preliminary biological testes, 22, 25-(OH)2D3 and 22-CH3O-25-OH-D3 have neither vitamin D activity nor antivitamin D activity.
双去氢胆固醇烯-3-四氢吡喃醚(1)通过三步反应从双去氢胆固醇酸中得到,与由2-甲基-3-丁炔-2-醇四氢吡喃醚衍生的锂乙炔化物偶联,产率为74%,得到胆固醇-5-烯-3β, 22, 25-三羟基-23-炔的1:1混合物,即3, 25-双(四氢吡喃)醚2a和2b。在分离C-22表异构体并确定其构型后,两种异构体均转化为22, 25-二羟基胆固醇-3, 22-二乙酸酯5a和5b,以及25-羟基-22-甲氧基胆固醇-3-乙酸酯8a和8b。这些化合物进一步转化为(22R)-和(22S)-22, 25-二羟基维生素D3(12a和12b)以及25-羟基-22-甲氧基维生素D3(14a和14b),通过相应的胆固醇-5, 7-二烯-3β, 22, 25-三醇-3, 22-二乙酸酯(9a和9b)以及胆固醇-5, 7-二烯-22-甲氧基-3β, 25-二醇-3-乙酸酯(10a和10b)。根据初步生物检测,22, 25-(OH)2D3和22-CH3O-25-OH-D3均不具有维生素D活性或抗维生素D活性。