methyl 3β-tert-butyldimethylsilyloxy-7-oxo-24-nor-5-cholen-23-oate | 1196085-99-0

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 类固醇和类固醇衍生物
• 英文名称: methyl 3β-tert-butyldimethylsilyloxy-7-oxo-24-nor-5-cholen-23-oate
• CAS: 1196085-99-0
• 化学式: C₃₀H₅₀O₄Si
• 分子量: 502.81
• InChiKey: MCKNCEUPYBCLKD-RVNOQOGQSA-N

反应信息

• 作为反应物：
  描述：

  methyl 3β-tert-butyldimethylsilyloxy-7-oxo-24-nor-5-cholen-23-oate 在 zinc(II) tetrahydroborate 作用下， 以 乙醚 、 苯 为溶剂， 反应 2.0h， 以50%的产率得到methyl 3β-tert-butyldimethylsilyloxy-7β-hydroxy-24-nor-5-cholen-23-oate
  参考文献：
  名称：

  Chemical synthesis of 3β-sulfooxy-7β-hydroxy-24-nor-5-cholenoic acid: An internal standard for mass spectrometric analysis of the abnormal Δ5-bile acids occurring in Niemann-Pick disease

  摘要：

  In Niemann-Pick disease, type C1, increased amounts of 3 beta,7 beta-dihydroxy-5-cholenoic acid are reported to be present in urinary bile acids. The compound occurs as a tri-conjugate, sulfated at C-3, N-acetylglucosamidated at C-7, and N-acylamidated with taurine or glycine at C-24. For sensitive LC-MS/MS analysis of this bile acid, a suitable internal standard is needed. We report here the synthesis of a satisfactory internal standard, 3 beta-sulfooxy-7 beta-hydroxy-24-nor-5-cholenoic acid (as the disodium salt). The key reactions involved were (1) the so-called "second order" Beckmann rearrangement (one-carbon degradation at C-24) of hyodeoxycholic acid (HDCA) 3,6-diformate with sodium nitrite in a mixture of trifluoroacetic anhydride and trifluoroacetic acid, (2) simultaneous inversion at C-3 and elimination at C-6 of the ditosylate derivatives of the resulting 3 alpha,6 alpha-dihydroxy-24-nor-5 beta-cholanoic acid with potassium acetate in aqueous N,N-dimethylformamide, and (3) regioselective sulfation at C-3 of an intermediary 3 beta,7 beta-dihydroxy-24-nor-Delta(5) derivative using sulfur trioxide-trimethylamine complex. Overall yield of the desired compound was 1.8% in 12 steps from HDCA. (C) 2009 Elsevier Inc. All rights reserved.

  DOI：

  10.1016/j.steroids.2009.04.007
• 作为产物：
  描述：

  3-[(3S,10R,13R,17R)-3-(tert-Butyl-dimethyl-silanyloxy)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-butyric acid methyl ester 在 叔丁基过氧化氢 、 重铬酸吡啶 、 Celite 作用下， 以 苯 为溶剂， 以84%的产率得到methyl 3β-tert-butyldimethylsilyloxy-7-oxo-24-nor-5-cholen-23-oate
  参考文献：
  名称：

  Chemical synthesis of 3β-sulfooxy-7β-hydroxy-24-nor-5-cholenoic acid: An internal standard for mass spectrometric analysis of the abnormal Δ5-bile acids occurring in Niemann-Pick disease

  摘要：

  In Niemann-Pick disease, type C1, increased amounts of 3 beta,7 beta-dihydroxy-5-cholenoic acid are reported to be present in urinary bile acids. The compound occurs as a tri-conjugate, sulfated at C-3, N-acetylglucosamidated at C-7, and N-acylamidated with taurine or glycine at C-24. For sensitive LC-MS/MS analysis of this bile acid, a suitable internal standard is needed. We report here the synthesis of a satisfactory internal standard, 3 beta-sulfooxy-7 beta-hydroxy-24-nor-5-cholenoic acid (as the disodium salt). The key reactions involved were (1) the so-called "second order" Beckmann rearrangement (one-carbon degradation at C-24) of hyodeoxycholic acid (HDCA) 3,6-diformate with sodium nitrite in a mixture of trifluoroacetic anhydride and trifluoroacetic acid, (2) simultaneous inversion at C-3 and elimination at C-6 of the ditosylate derivatives of the resulting 3 alpha,6 alpha-dihydroxy-24-nor-5 beta-cholanoic acid with potassium acetate in aqueous N,N-dimethylformamide, and (3) regioselective sulfation at C-3 of an intermediary 3 beta,7 beta-dihydroxy-24-nor-Delta(5) derivative using sulfur trioxide-trimethylamine complex. Overall yield of the desired compound was 1.8% in 12 steps from HDCA. (C) 2009 Elsevier Inc. All rights reserved.

  DOI：

  10.1016/j.steroids.2009.04.007