Methyl 4,6-Dideoxy-4,6-difluoro-α-D-talopyranoside | 84073-36-9

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: Methyl 4,6-Dideoxy-4,6-difluoro-α-D-talopyranoside
• 英文别名: (2S,3S,4R,5R,6R)-5-fluoro-6-(fluoromethyl)-2-methoxyoxane-3,4-diol
• CAS: 84073-36-9
• 化学式: C₇H₁₂F₂O₄
• 分子量: 198.167
• InChiKey: YPXFQOKNBHJLDB-JAIWFUSLSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.5
• 重原子数：
  13
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  58.9
• 氢给体数：
  2
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  Methyl 4,6-Dideoxy-4,6-difluoro-α-D-talopyranoside 以 水 为溶剂， 反应 18.0h， 生成 4,6-dideoxy-4,6-difluoro-α-D-talopyranose
  参考文献：
  名称：

  Overproduction of CMP-sialic acid synthetase for organic synthesis

  摘要：

  The gene coding for Escherichia coli CMP-sialic acid synthetase (E.C. 2.7.7.43) was cloned and overexpressed in E. coli through a primer-directed polymerase chain reaction. Two plasmids were constructed to produce the native enzyme and a modified enzyme fused with a decapeptide at the C-terminus. The decapeptide tag was used for detection of the enzyme production. Both enzymes produced from E. coli were isolated and purified with an Orange A dye resin and FPLC. Their properties were compared with respect to their kinetic parameters, stability, pH profiles, and substrate specificities. Both enzymes have similar k(cat) and K(m) for NeuAc and CTP but different pH profiles. Contrary to the native enzyme, the modified enzyme is more active at higher pH. Studies on specificity indicate that both enzymes have a high specific activity for C-9 modified NeuAc derivatives at neutral pH. Some C-5 modified (hydroxy, deoxy, and deoxyfluoro) NeuAc derivatives are not acceptable as substrates. The modified enzyme has been used in the synthesis of CMP-NeuAc from ManNAc and CMP and sialyl N-acetyllactosamine (Neu-alpha-2,6Gal-beta-1,4GlcNAc) with in situ generation of NeuAc and regeneration of CMP-NeuAc. The 6-O-acyl derivatives of ManNAc were prepared via transesterification in anhydrous dimethylformamide by using an engineered stable subtilisin variant as a catalyst, and the products were used as substrates in sialic acid aldolase-catalyzed synthesis of 9-O-acyl-NeuAc derivatives.

  DOI：

  10.1021/ja00036a044
• 作为产物：
  描述：

  甲基-D-丙噻 在 二乙胺基三氟化硫 作用下， 以72%的产率得到Methyl 4,6-Dideoxy-4,6-difluoro-α-D-talopyranoside
  参考文献：
  名称：

  二乙基氨基三氟化硫作为甲基糖苷的氟化试剂的立体选择性和区域选择性。

  摘要：

  在没有溶剂的情况下，甲基吡喃葡萄糖苷与二乙基氨基三氟化硫（DAST）反应，生成甲基双脱氧二氟和脱氧氟吡喃葡萄糖苷。甲基α-D-吡喃葡萄糖苷产生6-脱氧-6-氟-和4,6-二脱氧-4,6-二氟衍生物，在C-4处有沃尔登反型。甲基β-D-吡喃葡萄糖苷也产生了3,6-dideoxy-3,6-difluoro衍生物，在C-3处有Walden倒置。甲基6-O-三苯甲基-α-D-吡喃葡萄糖苷与DAST反应生成相应的4-脱氧-4-氟吡喃半乳糖苷衍生物。

  DOI：

  10.1016/0008-6215(83)84005-1

文献信息

• Stereo- and regio-selectivity of diethylaminosulfur trifluoride as a fluorinating reagent for methyl glycosides
  作者：Chandrasiri W. Somawardhana、Eric G. Brunngraber

  DOI：10.1016/0008-6215(83)84005-1

  日期：1983.9

  Methyl glycopyranosides reacted with diethylaminosulfur trifluoride (DAST) in the absence of solvent to yield methyl dideoxy-difluoro and deoxy-fluoro glycopyranosides. Methyl alpha-D-glycopyranosides produced 6-deoxy-6-fluoro- and 4,6-dideoxy-4,6-difluoro derivatives with Walden inversion at C-4. Methyl beta-D-glucopyranoside also produced a 3,6-dideoxy-3,6-difluoro derivative, with Walden inversion

  在没有溶剂的情况下，甲基吡喃葡萄糖苷与二乙基氨基三氟化硫（DAST）反应，生成甲基双脱氧二氟和脱氧氟吡喃葡萄糖苷。甲基α-D-吡喃葡萄糖苷产生6-脱氧-6-氟-和4,6-二脱氧-4,6-二氟衍生物，在C-4处有沃尔登反型。甲基β-D-吡喃葡萄糖苷也产生了3,6-dideoxy-3,6-difluoro衍生物，在C-3处有Walden倒置。甲基6-O-三苯甲基-α-D-吡喃葡萄糖苷与DAST反应生成相应的4-脱氧-4-氟吡喃半乳糖苷衍生物。
• Fluorinated carbohydrates. Use of DAST in the synthesis of fluorinated sugars
  作者：Peter J. Card

  DOI：10.1021/jo00151a027

  日期：1983.2
• Synthesis and Structure Elucidation of Benzoylated Deoxyfluoropyranosides
  作者：Aslan M. Esmurziev、Nebojsa Simic、Bård Helge Hoff、Eirik Sundby

  DOI：10.1080/07328303.2010.540055

  日期：2010.9

  Benzoylated deoxyfluoropyranosides have been synthesized, starting with protected, unprotected, or fluorinated precursors. Fluorination of eight derivatives was compared using DAST and Deoxo-Fluor as reagents. Deoxo-Fluor was found to be especially useful in the fluorination of methyl 2,3,4-O-tribenzoyl -D-mannopyranoside and -D-glucopyranoside, resulting in better yields and avoiding the 1,6-methoxy migration experienced with DAST for one derivative. The two reagents gave comparable yields in the fluorination of other methyl pyranosides, confirming Deoxo-Fluor as a safer alternative to DAST. Methyl -D-mannopyranoside underwent fluorination to yield the 4,6-difluorotalopyranoside and the corresponding cyclic sulfite. The NMR spectroscopic properties of 11 benzoyl deoxy-fluoropyranosides are reported.
• Overproduction of CMP-sialic acid synthetase for organic synthesis
  作者：Jennifer Lin Chun Liu、Gwo Jenn Shen、Yoshitaka Ichikawa、James F. Rutan、Gerardo Zapata、Willie F. Vann、Chi Huey Wong

  DOI：10.1021/ja00036a044

  日期：1992.5

  The gene coding for Escherichia coli CMP-sialic acid synthetase (E.C. 2.7.7.43) was cloned and overexpressed in E. coli through a primer-directed polymerase chain reaction. Two plasmids were constructed to produce the native enzyme and a modified enzyme fused with a decapeptide at the C-terminus. The decapeptide tag was used for detection of the enzyme production. Both enzymes produced from E. coli were isolated and purified with an Orange A dye resin and FPLC. Their properties were compared with respect to their kinetic parameters, stability, pH profiles, and substrate specificities. Both enzymes have similar k(cat) and K(m) for NeuAc and CTP but different pH profiles. Contrary to the native enzyme, the modified enzyme is more active at higher pH. Studies on specificity indicate that both enzymes have a high specific activity for C-9 modified NeuAc derivatives at neutral pH. Some C-5 modified (hydroxy, deoxy, and deoxyfluoro) NeuAc derivatives are not acceptable as substrates. The modified enzyme has been used in the synthesis of CMP-NeuAc from ManNAc and CMP and sialyl N-acetyllactosamine (Neu-alpha-2,6Gal-beta-1,4GlcNAc) with in situ generation of NeuAc and regeneration of CMP-NeuAc. The 6-O-acyl derivatives of ManNAc were prepared via transesterification in anhydrous dimethylformamide by using an engineered stable subtilisin variant as a catalyst, and the products were used as substrates in sialic acid aldolase-catalyzed synthesis of 9-O-acyl-NeuAc derivatives.