methyl 2,3-di-O-benzoyl-5-O-benzyl-β-D-xylofuranoside | 256509-98-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2,3-di-O-benzoyl-5-O-benzyl-β-D-xylofuranoside
• CAS: 256509-98-5
• 化学式: C₂₇H₂₆O₇
• 分子量: 462.499
• InChiKey: DEFCVNGLWIYODV-JPYYHWIRSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.03
• 重原子数：
  34.0
• 可旋转键数：
  9.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.26
• 拓扑面积：
  80.29
• 氢给体数：
  0.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  methyl 2,3-di-O-benzoyl-5-O-benzyl-β-D-xylofuranoside 在 氨 、 四氯化锡 作用下， 以 甲醇 、 乙腈 为溶剂， 反应 24.25h， 生成 9-(5-O-benzyl-β-D-xylofuranosyl)adenine
  参考文献：
  名称：

  A Novel Route for the Synthesis of Deoxy Fluoro Sugars and Nucleosides

  摘要：

  The reaction of (diethylamino)sulfur trifluoride (DAST) with methyl 5-O-benzoyl-beta-D-xylofuranoside (1) followed by column chromatography afforded the riboside 2 (62%) and the ribo-epoxide 3 (18%) (Scheme 1). Under similar reaction conditions, the alpha-D-anomer 4 gave the riboside 5 and the difluoride 6 in 60 and 9% yield, respectively Treatment of the beta-D-xyloside 10 with DAST gave, after chromatographic purification, the riboside 11 as the principal product (48% 1 Scheme 2). These results suggest that the C(3)-O-SF2NEt2 derivatives were initially formed in the case of the xylosides studied. The distinctive feature of the reaction of DAST with the beta-D-arabinoside 12 consists in the formation of a 3- or 5-benzylideneoxoniumyl-substituted intermediate on one of the consecutive transformations, which finally give rise to the inversion of the configuration at C(3) affording the xylosides 17 (18%) and 18 (55% ): the lyxoside 14 was also isolated from the reaction mixture in a yield of 25% (Scheme 3). In the presence of the non-participating 5-O-trityl group, i.e.,from the reaction products of 21 with DAST. the compounds 23 and 23 were isolated in 16 and 52% yield, respectively (Scheme 4). It may be thus reasonable to conclude that, in the case of the beta-D-arabinosides 12 and 21, the principal route of the reaction is the formation of the intermediate C(2)-O-SF2NEt2 derivative. Unlike the alpha-D-arabinoside 26 was converted to the lyxo-epoxide 25 (53%) and the lyxoside 27 (14%), which implies the intermediate formation of the C(3)-O-SF2NEt2 derivative (Scheme 5).

  DOI：

  10.1002/(sici)1522-2675(19991110)82:11<2052::aid-hlca2052>3.0.co;2-7
• 作为产物：
  描述：

  苯甲酰氯 、 methyl 5-O-benzyl-β-D-xylofuranoside 在 吡啶 作用下， 反应 18.0h， 以92%的产率得到methyl 2,3-di-O-benzoyl-5-O-benzyl-β-D-xylofuranoside
  参考文献：
  名称：

  A Novel Route for the Synthesis of Deoxy Fluoro Sugars and Nucleosides

  摘要：

  The reaction of (diethylamino)sulfur trifluoride (DAST) with methyl 5-O-benzoyl-beta-D-xylofuranoside (1) followed by column chromatography afforded the riboside 2 (62%) and the ribo-epoxide 3 (18%) (Scheme 1). Under similar reaction conditions, the alpha-D-anomer 4 gave the riboside 5 and the difluoride 6 in 60 and 9% yield, respectively Treatment of the beta-D-xyloside 10 with DAST gave, after chromatographic purification, the riboside 11 as the principal product (48% 1 Scheme 2). These results suggest that the C(3)-O-SF2NEt2 derivatives were initially formed in the case of the xylosides studied. The distinctive feature of the reaction of DAST with the beta-D-arabinoside 12 consists in the formation of a 3- or 5-benzylideneoxoniumyl-substituted intermediate on one of the consecutive transformations, which finally give rise to the inversion of the configuration at C(3) affording the xylosides 17 (18%) and 18 (55% ): the lyxoside 14 was also isolated from the reaction mixture in a yield of 25% (Scheme 3). In the presence of the non-participating 5-O-trityl group, i.e.,from the reaction products of 21 with DAST. the compounds 23 and 23 were isolated in 16 and 52% yield, respectively (Scheme 4). It may be thus reasonable to conclude that, in the case of the beta-D-arabinosides 12 and 21, the principal route of the reaction is the formation of the intermediate C(2)-O-SF2NEt2 derivative. Unlike the alpha-D-arabinoside 26 was converted to the lyxo-epoxide 25 (53%) and the lyxoside 27 (14%), which implies the intermediate formation of the C(3)-O-SF2NEt2 derivative (Scheme 5).

  DOI：

  10.1002/(sici)1522-2675(19991110)82:11<2052::aid-hlca2052>3.0.co;2-7