phenyl 2,3-di-O-benzyl-4-O-(p-methoxybenzyl)-α-D-thiomannopyranoside | 850647-86-8

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: phenyl 2,3-di-O-benzyl-4-O-(p-methoxybenzyl)-α-D-thiomannopyranoside
• 英文别名: phenylthio 2,3-di-O-benzyl-4-O-(p-methoxybenzyl)-α-D-mannopyranoside；Bn(-2)[Bn(-3)][Mob(-4)]Man(a)-SPh；[(2R,3R,4S,5S,6R)-3-[(4-methoxyphenyl)methoxy]-4,5-bis(phenylmethoxy)-6-phenylsulfanyloxan-2-yl]methanol
• CAS: 850647-86-8
• 化学式: C₃₄H₃₆O₆S
• 分子量: 572.722
• InChiKey: ZTWRXWZDGNYHMS-ZYSDIQSLSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.8
• 重原子数：
  41
• 可旋转键数：
  13
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.29
• 拓扑面积：
  91.7
• 氢给体数：
  1
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  phenyl 2,3-di-O-benzyl-4-O-(p-methoxybenzyl)-α-D-thiomannopyranoside 在 Stryker's reagent 、 水 、 戴斯-马丁氧化剂 、 2,3-二氯-5,6-二氰基-1,4-苯醌 、 2,4,6-三叔丁基嘧啶 作用下， 以 四氢呋喃 、 甲醇 、 二氯甲烷 、 二氯甲烷-D2 、 苯 为溶剂， 反应 69.17h， 生成 (2R,3S,4S,4aR,6S,8aR)-3,4-bis(benzyloxy)-6-phenyloctahydropyrano[3,2-b]pyran-2-yl trifluoromethanesulfonate
  参考文献：
  名称：

  Influence of O6 in Mannosylations Using Benzylidene Protected Donors: Stereoelectronic or Conformational Effects?

  摘要：

  The stereoselective synthesis of beta-mannosides and the underlying reaction mechanism have been thoroughly studied, and especially the benzylidene-protected mannosides have gained a lot of attention since the corresponding mannosyl triflates often give excellent selectivity. The hypothesis for the enhanced stereoselectivity has been that the benzylidene locks the molecule in a less reactive conformation with the O6 trans to the ring oxygen (O5), which would stabilize the formed alpha-triflate and subsequent give beta-selectivity. In this work, the hypothesis is challenged by using the carbon analogue (C7) of the benzylidene-protected mannosyl donor, which is investigated in terms of diastereoselectivity and reactivity and by low-temperature NMR In terms of diastereoselectivity, the C-7-analogue behaves similarly to the benzylidene-protected donor, but its low-temperature NMR reveals the formation of several reactive intermediate. One of the intermediates was found to be the beta-oxosulfonium ion. The reactivity of the donor was found to be in between that of the "torsional" disarmed and an armed donor.

  DOI：

  10.1021/jo302455d
• 作为产物：
  描述：

  phenyl 2,3-di-O-benzyl-4,6-O-p-methoxybenzylidene-1-thio-α-D-mannopyranoside 在 二异丁基氢化铝 作用下， 以 二氯甲烷 、 甲苯 为溶剂， 反应 5.0h， 以90%的产率得到phenyl 2,3-di-O-benzyl-4-O-(p-methoxybenzyl)-α-D-thiomannopyranoside
  参考文献：
  名称：

  D-和L-甘油-β-D-甘露聚糖-吡喃葡萄糖的合成和立体选择性糖基化。

  摘要：

  [反应：请参阅文字]一种直接立体控制合成D-和L-甘油-β-D-甘露聚糖-七吡喃糖苷的方法，例如从CNCTC 113/92 LPS（在O-特异性多糖的重复单元中发现的那些）（描述了血清型54）。该方法依赖于4，6-O-亚苄基乙缩醛的存在，以在异头中心进行立体控制。C6的构型（L或D甘油）的重要性最低。

  DOI：

  10.1021/ol050224s

文献信息

• Synthesis and Stereoselective Glycosylation of <scp>d</scp>- and <scp>l</scp>-<i>glycero</i>-β-<scp>d</scp>-<i>manno</i>-Heptopyranoses
  作者：David Crich、Abhisek Banerjee

  DOI：10.1021/ol050224s

  日期：2005.3.1

  [reaction: see text] A method for the direct stereocontrolled synthesis of D- and L-glycero-beta-D-manno-heptopyranosides such as those found in the repeating unit of the O-specific polysaccharide from the CNCTC 113/92 LPS (serotype 54) is described. The method relies on the presence of a 4,6-O-benzylidene acetal to effect stereocontrol at the anomeric center; the configuration at C6 (L- or D-glycero)

  [反应：请参阅文字]一种直接立体控制合成D-和L-甘油-β-D-甘露聚糖-七吡喃糖苷的方法，例如从CNCTC 113/92 LPS（在O-特异性多糖的重复单元中发现的那些）（描述了血清型54）。该方法依赖于4，6-O-亚苄基乙缩醛的存在，以在异头中心进行立体控制。C6的构型（L或D甘油）的重要性最低。
• Stereocontrolled Synthesis of the <scp>d</scp>- and <scp>l</scp>-<i>glycero</i>-β-<scp>d</scp>-<i>manno</i>-Heptopyranosides and Their 6-Deoxy Analogues. Synthesis of Methyl α-<scp>l</scp>-<i>Rhamno</i>-pyranosyl-(1→3)-<scp>d</scp>-<i>glycero</i>-β-<scp>d</scp>-<i>manno</i>-heptopyranosyl- (1→3)-6-deoxy-<i>glycero</i>-β-<scp>d</scp>-<i>manno</i>-heptopyranosyl-(1→4)-α-<scp>l</scp>- <i>rhamno</i>-pyranoside, a Tetrasaccharide Subunit of the Lipopolysaccharide from <i>Plesimonas shigelloides</i>
  作者：David Crich、Abhisek Banerjee

  DOI：10.1021/ja061594u

  日期：2006.6.1

  The synthesis of D-and L-glycero-alpha-manno-thioheptopyranosides, protected with 4,6-O-alkylidenetype acetals is described. In glycosylations carried out with preactivation with the 1-benzenesulfinylpiperidine/trifluoromethanesulfonic anhydride couple, both the D-and L-glycero series exhibit excellent, beta-selectivity with a range of glycosyl acceptors. In contrast, a 4,7-O-alkylidene acetal was found not to afford, beta-selectivity. With a 4,6-O-[1-cyano-2-(2-iodophenyl) ethylidene] acetal protected thioglycoside, excellent, beta-selectivity was obtained in glycosylation reactions, and subsequent treatment with tributyltin hydride and azoisobutyronitrile brought about clean fragmentation to the 6-deoxy-glycero-beta-D-manno-heptopyranosides. This chemistry was applied to the stereocontrolled synthesis of methyl alpha-L-rhamno-pyranosyl-(1 -> 3)-D-glycero-beta- D-manno-heptopyranosyl-(1 -> 3)-6-deoxy-glycero-beta-D-manno-heptopyranosyl-(1 -> 4)-alpha-L-rhamno-pyranoside, a component of the lipopolysaccharide from Plesimonas shigelloides.
• Influence of O6 in Mannosylations Using Benzylidene Protected Donors: Stereoelectronic or Conformational Effects?
  作者：Tobias Gylling Frihed、Marthe T. C. Walvoort、Jeroen D. C. Codée、Gijs A. van der Marel、Mikael Bols、Christian Marcus Pedersen

  DOI：10.1021/jo302455d

  日期：2013.3.15

  The stereoselective synthesis of beta-mannosides and the underlying reaction mechanism have been thoroughly studied, and especially the benzylidene-protected mannosides have gained a lot of attention since the corresponding mannosyl triflates often give excellent selectivity. The hypothesis for the enhanced stereoselectivity has been that the benzylidene locks the molecule in a less reactive conformation with the O6 trans to the ring oxygen (O5), which would stabilize the formed alpha-triflate and subsequent give beta-selectivity. In this work, the hypothesis is challenged by using the carbon analogue (C7) of the benzylidene-protected mannosyl donor, which is investigated in terms of diastereoselectivity and reactivity and by low-temperature NMR In terms of diastereoselectivity, the C-7-analogue behaves similarly to the benzylidene-protected donor, but its low-temperature NMR reveals the formation of several reactive intermediate. One of the intermediates was found to be the beta-oxosulfonium ion. The reactivity of the donor was found to be in between that of the "torsional" disarmed and an armed donor.