[(4aR,8R,8aR)-2,2-dimethyl-4,4a,8,8a-tetrahydropyrano[3,2-d][1,3]dioxin-8-yl]oxy-(bromomethyl)-dimethylsilane | 167904-68-9

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡喃二恶英
• 英文名称: [(4aR,8R,8aR)-2,2-dimethyl-4,4a,8,8a-tetrahydropyrano[3,2-d][1,3]dioxin-8-yl]oxy-(bromomethyl)-dimethylsilane
• CAS: 167904-68-9
• 化学式: C₁₂H₂₁BrO₄Si
• 分子量: 337.286
• InChiKey: NWFNVYIGGONCMA-MXWKQRLJSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.57
• 重原子数：
  18
• 可旋转键数：
  3
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.83
• 拓扑面积：
  36.9
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  [(4aR,8R,8aR)-2,2-dimethyl-4,4a,8,8a-tetrahydropyrano[3,2-d][1,3]dioxin-8-yl]oxy-(bromomethyl)-dimethylsilane 在 偶氮二异丁腈 、 三丁基氯化锡 、 sodium cyanoborohydride 作用下， 以 叔丁醇 为溶剂， 反应 4.0h， 生成
  参考文献：
  名称：

  Serial Radical Reactions of Glycals: Ready Routes to Highly Functionalized C-Glycosyl Derivatives

  摘要：

  The C3-OH of partially protected glycals can be readily converted into mixed acetals of 2-bromoacetaldehyde or into silylmethylene bromides. Reaction of these derivatives with tri-n-butyltin hydride gives a radical that cyclizes efficiently to generate a stabilized radical at C1. The latter can be trapped very efficiently with acrylonitrile, tert-butyl isocyanide, allyltri-n-butyltin, tributyltin acrylates, or a complex pyranoside enone to afford C-glycosides in which a 1,2 disubstitution has taken place. The stereochemistry of the resulting 1,2 disubstituted product is dependent, at C-2, on the stereochemistry of the C3-OH and at the anomeric center (C-1) upon the interplay of (a) steric effects and (b) the electronic bias of the radical anomeric effect.

  DOI：

  10.1021/jo00117a044
• 作为产物：
  描述：

  溴甲基二甲基氯硅烷 、 4,6-O-异亚丙基-D-葡萄糖醛 在 三乙胺 作用下， 以 二氯甲烷 为溶剂， 生成 [(4aR,8R,8aR)-2,2-dimethyl-4,4a,8,8a-tetrahydropyrano[3,2-d][1,3]dioxin-8-yl]oxy-(bromomethyl)-dimethylsilane
  参考文献：
  名称：

  Serial Radical Reactions of Glycals: Ready Routes to Highly Functionalized C-Glycosyl Derivatives

  摘要：

  The C3-OH of partially protected glycals can be readily converted into mixed acetals of 2-bromoacetaldehyde or into silylmethylene bromides. Reaction of these derivatives with tri-n-butyltin hydride gives a radical that cyclizes efficiently to generate a stabilized radical at C1. The latter can be trapped very efficiently with acrylonitrile, tert-butyl isocyanide, allyltri-n-butyltin, tributyltin acrylates, or a complex pyranoside enone to afford C-glycosides in which a 1,2 disubstitution has taken place. The stereochemistry of the resulting 1,2 disubstituted product is dependent, at C-2, on the stereochemistry of the C3-OH and at the anomeric center (C-1) upon the interplay of (a) steric effects and (b) the electronic bias of the radical anomeric effect.

  DOI：

  10.1021/jo00117a044

文献信息

• Serial Radical Reactions of Glycals: Ready Routes to Highly Functionalized C-Glycosyl Derivatives
  作者：J. Cristobal Lopez、Ana M. Gomez、Bert Fraser-Reid

  DOI：10.1021/jo00117a044

  日期：1995.6

  The C3-OH of partially protected glycals can be readily converted into mixed acetals of 2-bromoacetaldehyde or into silylmethylene bromides. Reaction of these derivatives with tri-n-butyltin hydride gives a radical that cyclizes efficiently to generate a stabilized radical at C1. The latter can be trapped very efficiently with acrylonitrile, tert-butyl isocyanide, allyltri-n-butyltin, tributyltin acrylates, or a complex pyranoside enone to afford C-glycosides in which a 1,2 disubstitution has taken place. The stereochemistry of the resulting 1,2 disubstituted product is dependent, at C-2, on the stereochemistry of the C3-OH and at the anomeric center (C-1) upon the interplay of (a) steric effects and (b) the electronic bias of the radical anomeric effect.