2,6-di-O-acetyl-1,5-anhydro-3,4-O-isopropylidene-D-galactitol | 143916-22-7

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二氧吡喃
• 英文名称: 2,6-di-O-acetyl-1,5-anhydro-3,4-O-isopropylidene-D-galactitol
• 英文别名: [(3aS,4R,7S,7aR)-7-acetyloxy-2,2-dimethyl-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-4-yl]methyl acetate
• CAS: 143916-22-7
• 化学式: C₁₃H₂₀O₇
• 分子量: 288.298
• InChiKey: FZJKDCZVERJLML-NOOOWODRSA-N

物化性质

• 沸点：
  359.1±42.0 °C(Predicted)
• 密度：
  1.23±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  0.1
• 重原子数：
  20
• 可旋转键数：
  5
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.85
• 拓扑面积：
  80.3
• 氢给体数：
  0
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  2,6-di-O-acetyl-1,5-anhydro-3,4-O-isopropylidene-D-galactitol 在 Subtilisin Carlsberg porcine pancreatic lipase 作用下， 以 水 、 丙酮 为溶剂， 反应 40.0h， 以75%的产率得到2-O-acetyl-1,5-anhydro-3,4-O-isopropylidene-D-galactitol
  参考文献：
  名称：

  Efficient Differentiation of the Hydroxyl Groups of 3,4-O-Isopropylidene-D-Galactopyranosides by Lipase Catalyzed Esterification and De - Esterification

  摘要：

  The Pseudomonas sp. (LPS) promoted acyl transfer from vinyl acetate to selected 3,4-O-isopropylidene-D-galactopyranosides takes place in a completely selective manner giving in high yield the corresponding 6-O-acetates. The acetylation rate is strongly dependent on the type and the orientation of the aglycon, varying from a maximum of reactivity for the 1-deoxy derivative, 1,5-anhydro-3,4-O-isopropylidene-D-galactitol (1d), to a minimum for beta configurated alkyl glycosides and showing a complete loss of reactivity for 3',4':2,3:5,6-tri-O-isopropylidenelactose dimethyl acetal (1e). The latter compound is, however, selectively 6'-O-esterified in good yield by lipase from Candida Antarctica and vinyl acetate. Also the course of the enzymatic hydrolysis of 2,6-di-O-acetyl-3,4-O-isopropylidene-D-galactopyranosides 2 is dependent on the type of the aglycon, both for the reaction rate and the selectivity. The 2-O-acetates 4 are selectively obtained in good yields with porcine pancreatic lipase (PPL) promoted hydrolysis in the case of beta- and alpha-methyl, and 1-deoxy derivatives (2a, 2b and 2d), while for beta-benzyl (2c) and lactose (2e) analogues satisfactory results are obtained with lipase from Mucor miehei (IM20).

  DOI：

  10.1080/07328309708005733
• 作为产物：
  描述：

  2,3,4,6-四乙酰氧基-alpha-D-吡喃糖溴化物 在 palladium on activated charcoal 吡啶 、 camphor-10-sulfonic acid 、 氢气 、 sodium methylate 、 三乙胺 作用下， 以 甲醇 、 乙酸乙酯 为溶剂， 20.0 ℃ 、101.33 kPa 条件下， 反应 71.0h， 生成 2,6-di-O-acetyl-1,5-anhydro-3,4-O-isopropylidene-D-galactitol
  参考文献：
  名称：

  Original Synthesis of Linear, Branched and Cyclic Oligoglycerol Standards

  摘要：

  DOI：

  10.1002/1099-0690(200103)2001:5<875::aid-ejoc875>3.0.co;2-r

文献信息

• A new synthesis of L-ascorbic acid from D-galactose
  作者：Pier Luigi Barili、Giancarlo Berti、Felicia D'Andrea、Valeria Di Bussolo、Ilaria Granucci

  DOI：10.1016/s0040-4020(01)88219-3

  日期：1992.1

  1,5-Anhydro-d-galactitol, easily available from d-galactose, was selectively protected in positions 2, 3 and 4 and converted into 5-O-acetyl-2,6-anhydro-3-deoxyl-threo-hex-2-enonic acid methyl ester, which, on reaction with MCPBA in acetic acid gave 2,5-di-O-acetyl-α-l-lyxo-hex-2-ulopyranosonic acid methyl ester. Reaction of the latter with sodium methoxide produced sodium l-ascorbate in high yield

  可以容易地从d-半乳糖获得的1，5-脱水-d-半乳糖醇在2、3和4位被选择性地保护，并转化为5 - O-乙酰基-2,6-脱水3-脱氧-苏式-hex- 2-烯酸甲酯，在乙酸中与MCPBA反应后，得到2，5-二-O-乙酰基-α -1- lyxo -hex-2-ulyryranosonic酸甲酯。后者与甲醇钠反应以高产率产生1-抗坏血酸钠。还讨论了几种副反应和某些中间体的构象。