4-benzoyloxy-5-bromomethyl-2,3-C-(2-propen-2'-one)-3-deoxy-3-C-methyl-α-D-arabino-hexopyranosid-2-ulose | 217185-55-2

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 4-benzoyloxy-5-bromomethyl-2,3-C-(2-propen-2'-one)-3-deoxy-3-C-methyl-α-D-arabino-hexopyranosid-2-ulose
• 英文别名: [(1S,3S,4S,4aR)-3-(bromomethyl)-1-methoxy-4a-methyl-6-oxo-1,3,4,5-tetrahydrocyclopenta[c]pyran-4-yl] benzoate
• CAS: 217185-55-2
• 化学式: C₁₈H₁₉BrO₅
• 分子量: 395.25
• InChiKey: JLEQDSIPPLTJFB-XYVMCAHJSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.3
• 重原子数：
  24
• 可旋转键数：
  5
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.44
• 拓扑面积：
  61.8
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  4-benzoyloxy-5-bromomethyl-2,3-C-(2-propen-2'-one)-3-deoxy-3-C-methyl-α-D-arabino-hexopyranosid-2-ulose 在 锌 作用下， 以 水 、 异丙醇 为溶剂， 反应 22.0h， 以39%的产率得到(3R,1'R,2'R)-2'-formyl-1'-methyl-3-cyclopentan-4'-one-2-propenyl-3-benzoate
  参考文献：
  名称：

  The Stereoselective Preparation of an Enantiomerically Pure Cyclopentane Using Intramolecular Aldol Cyclopentaannulation of a Glucose Derivative

  摘要：

  Methods for the annulation of carbohydrates have found extensive applications in organic synthesis. We report here a new protocol for the stereoselective conversion of glucose into an enantiomerically pure cyclopentane aldehyde 22. The readily available epoxide 15 was reacted with allyl Grignard to produce alcohol 16 in 86% yield. Swern oxidation followed by epimerization using triethylamine in N,N-dimethylformamide furnished the ketone 17 also in 86% yield. Regioselective deprotonation with lithium hexamethyldisilazane in THF was followed by methylation with methyl iodide and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidone as cosolvent to give 80% yield of ketone 18. Oxidation of ketone 18 by the Wacker procedure gave the 1,4-diketone 19 in 56% yield. Intramolecular aldol condensation occurred readily on treatment of diketone 19 with potassium tert-butoxide in toluene to furnish a 90% yield of enone 20. Treatment with N-bromosuccinimide produced the bromoester 21 in 72% yield, which was reduced to a mixture of aldehydes 22 (61%) and 23 (14%) with zinc shot in 2-propanol.

  DOI：

  10.1021/jo981225j
• 作为产物：
  描述：

  methyl 2,3-anhydro-4,6-O-benzilidene-α-D-mannopyranoside 在 N,N-二甲基丙烯基脲 、 N-溴代丁二酰亚胺(NBS) 、 potassium tert-butylate 、 氧气 、 二甲基亚砜 、 三乙胺 、 barium carbonate 、 三氟乙酸酐 、 copper dichloride 、 palladium dichloride 、 lithium hexamethyldisilazane 作用下， 以 四氢呋喃 、 四氯化碳 、 水 、 N,N-二甲基甲酰胺 、 甲苯 为溶剂， 反应 56.0h， 生成 4-benzoyloxy-5-bromomethyl-2,3-C-(2-propen-2'-one)-3-deoxy-3-C-methyl-α-D-arabino-hexopyranosid-2-ulose
  参考文献：
  名称：

  The Stereoselective Preparation of an Enantiomerically Pure Cyclopentane Using Intramolecular Aldol Cyclopentaannulation of a Glucose Derivative

  摘要：

  Methods for the annulation of carbohydrates have found extensive applications in organic synthesis. We report here a new protocol for the stereoselective conversion of glucose into an enantiomerically pure cyclopentane aldehyde 22. The readily available epoxide 15 was reacted with allyl Grignard to produce alcohol 16 in 86% yield. Swern oxidation followed by epimerization using triethylamine in N,N-dimethylformamide furnished the ketone 17 also in 86% yield. Regioselective deprotonation with lithium hexamethyldisilazane in THF was followed by methylation with methyl iodide and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidone as cosolvent to give 80% yield of ketone 18. Oxidation of ketone 18 by the Wacker procedure gave the 1,4-diketone 19 in 56% yield. Intramolecular aldol condensation occurred readily on treatment of diketone 19 with potassium tert-butoxide in toluene to furnish a 90% yield of enone 20. Treatment with N-bromosuccinimide produced the bromoester 21 in 72% yield, which was reduced to a mixture of aldehydes 22 (61%) and 23 (14%) with zinc shot in 2-propanol.

  DOI：

  10.1021/jo981225j