1,3-di-O-acetyl-2,4,6-tri-O-benzyl-α-D-glucopyranose | 89104-66-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 1,3-di-O-acetyl-2,4,6-tri-O-benzyl-α-D-glucopyranose
• CAS: 89104-66-5
• 化学式: C₃₁H₃₄O₈
• 分子量: 534.606
• InChiKey: MXOXBBWCHPAYGZ-SAEUYMBFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.59
• 重原子数：
  39.0
• 可旋转键数：
  12.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.35
• 拓扑面积：
  89.52
• 氢给体数：
  0.0
• 氢受体数：
  8.0

反应信息

• 作为反应物：
  描述：

  1,3-di-O-acetyl-2,4,6-tri-O-benzyl-α-D-glucopyranose 在 乙酸肼 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 1.5h， 以55%的产率得到3-O-acetyl-2,4,6-tri-O-benzyl-D-glucopyranose
  参考文献：
  名称：

  Is an acyl group at O-3 in glucosyl donors able to control α-stereoselectivity of glycosylation? The role of conformational mobility and the protecting group at O-6

  摘要：

  The stereodirecting effect of a 3-O-acetyl protecting group, which is potentially capable of the remote anchimeric participation, and other protecting groups in 2-O-benzyl glucosyl donors with flexible and rigid conformations has been investigated. To this aim, an array of N-phenyltrifluoroacetimidoyl and sulfoxide donors bearing either 3-O-acetyl or 3-O-benzyl groups in combination with 4,6-di-O-benzyl, 6-O-acyl-4-O-benzyl, or 4,6-O-benzylidene protecting groups was prepared. The conformationally flexible 3-O-acetylated glucosyl donor protected at other positions with O-benzyl groups demonstrated very low or no alpha-stereoselectivity upon glycosylation of primary or secondary acceptors. On the contrary, 3,6-di-O-acylated glucosyl donors proved to be highly alpha-stereoselective as well as the donor having a single potentially participating acetyl group at O-6. The 3,6-di-O-acylated donor was shown to be the best alpha-glucosylating block for the primary acceptor, whereas the best alpha-selectivity of glycosylation of the secondary acceptor was achieved with the 6-O-acylated donor. Glycosylation of the secondary acceptor with the conformationally constrained 3-O-acetyl-4,6-O-benzylidene-protected donor displayed under standard conditions (-35 degrees C) even lower alpha-selectivity as compared to the 3-O-benzyl analogue. However, increasing the reaction temperature essentially raised the alpha-stereoselectivities of glycosylation with both 3-O-acetyl and 3-O-benzyl donors and made them almost equal. The stereodirecting effects of protecting groups observed for N-phenyltrifluoroacetimidoyl donors were also generally proven for sulfoxide donors. (C) 2013 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.carres.2013.11.016
• 作为产物：
  描述：

  (2R,3S,4S,5R,6S)-3,5-Bis-benzyloxy-2-benzyloxymethyl-6-methoxy-tetrahydro-pyran-4-ol 、 乙酸酐 在 盐酸 、 乙酸酐 、 吡啶 作用下， 以 水 为溶剂， 反应 1.0h， 以38%的产率得到1,3-di-O-acetyl-2,4,6-tri-O-benzyl-α-D-glucopyranose
  参考文献：
  名称：

  Is an acyl group at O-3 in glucosyl donors able to control α-stereoselectivity of glycosylation? The role of conformational mobility and the protecting group at O-6

  摘要：

  The stereodirecting effect of a 3-O-acetyl protecting group, which is potentially capable of the remote anchimeric participation, and other protecting groups in 2-O-benzyl glucosyl donors with flexible and rigid conformations has been investigated. To this aim, an array of N-phenyltrifluoroacetimidoyl and sulfoxide donors bearing either 3-O-acetyl or 3-O-benzyl groups in combination with 4,6-di-O-benzyl, 6-O-acyl-4-O-benzyl, or 4,6-O-benzylidene protecting groups was prepared. The conformationally flexible 3-O-acetylated glucosyl donor protected at other positions with O-benzyl groups demonstrated very low or no alpha-stereoselectivity upon glycosylation of primary or secondary acceptors. On the contrary, 3,6-di-O-acylated glucosyl donors proved to be highly alpha-stereoselective as well as the donor having a single potentially participating acetyl group at O-6. The 3,6-di-O-acylated donor was shown to be the best alpha-glucosylating block for the primary acceptor, whereas the best alpha-selectivity of glycosylation of the secondary acceptor was achieved with the 6-O-acylated donor. Glycosylation of the secondary acceptor with the conformationally constrained 3-O-acetyl-4,6-O-benzylidene-protected donor displayed under standard conditions (-35 degrees C) even lower alpha-selectivity as compared to the 3-O-benzyl analogue. However, increasing the reaction temperature essentially raised the alpha-stereoselectivities of glycosylation with both 3-O-acetyl and 3-O-benzyl donors and made them almost equal. The stereodirecting effects of protecting groups observed for N-phenyltrifluoroacetimidoyl donors were also generally proven for sulfoxide donors. (C) 2013 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.carres.2013.11.016