(2R,4aR,6S,7S,8R,8aR)-8-Benzyloxy-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-ol | 2774-19-8

• 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: (2R,4aR,6S,7S,8R,8aR)-8-Benzyloxy-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-ol
• 英文别名: methyl 3-O-benzyl-(R)-4,6-O-benzylidene-α-D-mannopyranoside；methyl 3-O-benzyl-4,6-O-benzylidene-α-D-mannopyranoside；methyl 3-O-benzyl-4,6-O-benzylidine-α-D-glucopyranoside；methyl 4,6-O-benzylidene-3-O-benzyl-α-D-mannopyranoside；methyl-4,6-O-benzylidene-3-O-benzyl-α-D-mannopyranoside；methyl 3-O-benzyl-4,6-benzylidene-α-D-mannopyranoside；(2R,4aR,6S,7S,8R,8aR)-6-methoxy-2-phenyl-8-phenylmethoxy-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-7-ol
• CAS: 2774-19-8；14419-69-3；15887-67-9；23392-28-1；57539-08-9；61277-63-2；74410-51-8；76419-48-2；80734-73-2；86363-44-2；89301-79-1；94061-92-4；94062-87-0；108739-92-0；129706-93-0；143005-12-3；65877-21-6
• 化学式: C₂₁H₂₄O₆
• 分子量: 372.418
• InChiKey: QRMYFVCKXAQEDN-RLLAOZKESA-N

物化性质

• 沸点：
  535.3±50.0 °C(Predicted)
• 密度：
  1.27±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.9
• 重原子数：
  27
• 可旋转键数：
  5
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  66.4
• 氢给体数：
  1
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  (2R,4aR,6S,7S,8R,8aR)-8-Benzyloxy-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-ol 在 (C5Ph5)Ru(Cl)(CO)2 、 potassium tert-butylate 作用下， 以 对二甲苯 为溶剂， 反应 48.0h， 生成 methyl 4,6-O-benzylidene-3-O-benzyl-α-D-glucopyranoside
  参考文献：
  名称：

  钌催化碳水化合物醇的差向异构化作为确定吡喃己糖苷中差向异构体相互转化平衡的方法

  摘要：

  仲碳水化合物醇的钌催化差向异构化用于确定部分保护的葡萄糖、甘露糖和阿洛糖衍生物的非异头差向异构体之间的热力学平衡。在两个单独的实验中，使用环戊二烯基钌催化剂来使两种纯差向异构醇中的每一种差向异构化。进行差向异构化反应，直到从两个实验中获得相同比例的差向异构体。

  DOI：

  10.1002/ejoc.201100504
• 作为产物：
  描述：

  alpha-甲基葡萄糖甙 在 吡啶 、 N,N-二异丙基乙胺 、 四丁基亚硝酸铵 作用下， 以 二氯甲烷 、 甲苯 为溶剂， 反应 32.0h， 生成 (2R,4aR,6S,7S,8R,8aR)-8-Benzyloxy-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-ol
  参考文献：
  名称：

  Synthesis and binding affinity analysis of α1-2- and α1-6- O / S -linked dimannosides for the elucidation of sulfur in glycosidic bonds using quartz crystal microbalance sensors

  摘要：

  The role of sulfur in glycosidic bonds has been evaluated using quartz crystal microbalance methodology. Synthetic routes towards alpha 1-2- and alpha 1-6-linked dimannosides with S-or O-glycosidic bonds have been developed, and the recognition properties assessed in competition binding assays with the cognate lectin concanavalin A. Mannose-presenting QCM sensors were produced using photoinitiated, nitrenemediated immobilization methods, and the subsequent binding study was performed in an automated flow-through instrumentation, and correlated with data from isothermal titration calorimetry. The recorded Kd-values corresponded well with reported binding affinities for the O-linked dimannosides with affinities for the alpha 1-2-linked dimannosides in the lower micromolar range. The S-linked analogs showed slightly disparate effects, where the alpha 1-6-linked analog showed weaker affinity than the O-linked dimannoside, as well as positive apparent cooperativity, whereas the alpha 1-2-analog displayed very similar binding compared to the O-linked structure. (C) 2017 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.carres.2017.09.015

文献信息

• β-Directing Effect of Electron-Withdrawing Groups at <i>O</i>-3, <i>O</i>-4, and <i>O</i>-6 Positions and α-Directing Effect by Remote Participation of 3-<i>O</i>-Acyl and 6-<i>O</i>-Acetyl Groups of Donors in Mannopyranosylations
  作者：Ju Yuel Baek、Bo-Young Lee、Myung Gi Jo、Kwan Soo Kim

  DOI：10.1021/ja907252u

  日期：2009.12.9

  isolation of a stable bicyclic trichlorooxazine ring resulting from the intramolecular trapping of the anomeric oxocarbenium ion by 3-O-trichloroacetimidoyl group provided evidence for this remote participation. The triflate anion, counteranion of the mannosyl oxocarbenium ion, was essential for the beta-selectivity, and covalent alpha-mannosyl triflates with an electron-withdrawing group at O-3, O-4

  发现在 O-3、O-4 或 O-6 位具有吸电子的邻三氟甲基苯磺酰基、苄基磺酰基、对硝基苯甲酰基、苯甲酰基或乙酰基的各种受体的甘露糖基化被发现是 β 选择性的，除非供体具有 3-O-酰基和 6-O-乙酰基，主要产物为 α-甘露糖苷。3-O-酰基和 6-O-乙酰基的 α 导向作用归因于它们的远程参与，以及由 3-O-三氯乙亚胺酰基对异头氧代碳鎓离子的分子内捕获所产生的稳定双环三氯恶嗪环的分离小组为这种远程参与提供了证据。三氟甲磺酸盐阴离子，甘露糖基氧代碳鎓离子的抗衡阴离子，对β-选择性至关重要，共价α-甘露糖基三氟甲磺酸盐在O-3处具有吸电子基团，O-4或O-6通过低温NMR检测。强吸电子磺酰基在甘露糖基化中表现出更高的β-导向效应，使α-甘露糖基三氟甲磺酸酯比弱吸电子酰基更稳定。因此，我们提出了 β-甘露糖基化的机制和 β 导向效应的起源：吸电子基团将稳定 α-甘露糖基三氟甲磺酸酯中间体，以及
• [EN] SUGAR-LINKER-DRUG CONJUGATES<br/>[FR] CONJUGUÉS DE MÉDICAMENT-SÉQUENCE DE LIAISON DU SUCRE
  申请人：UNIV ARIZONA

  公开号：WO2014145109A1

  公开（公告）日：2014-09-18

  The present disclosure relates to sugar-linker-drug conjugates, of the formula [A-B-]n-L-D, wherein A is a saccharide; B is a spacer, n is an integer selected from 1 to 3; L is a linker group and D is a drug having a chemically reactive functional group selected from the group consisting of a primary or secondary amine, hydroxyl, sulfhydryl, carboxyl, aldehyde and ketone. Pharmaceutical compositions comprising the conjugates and methods of using thern are also provided.

  本公开涉及糖-连接剂-药物共轭物，其化学式为[A-B-]n-L-D，其中A是一种糖类；B是一个间隔物，n是从1到3中选择的整数；L是一个连接基团，D是一种具有从一次或二次胺、羟基、硫醇、羧基、醛基和酮基中选择的化学反应性官能团的药物。还提供了包括这些共轭物的药物组合物和使用方法。
• β-Rhamnosides from 6-thio mannosides
  作者：Alphert E. Christina、Daan van der Es、Jasper Dinkelaar、Hermen S. Overkleeft、Gijsbert A. van der Marel、Jeroen D. C. Codée

  DOI：10.1039/c2cc17623h

  日期：——

  Upon condensation of 6-thio-6-deoxy-mannosyl donors 1,2-cis products are obtained with a high degree of stereoselectivity. Subsequent reductive removal of the 6-thio functionality gives 1,2-cisrhamnosides. The 1,2-cis-selectivity can be rationalized with a product forming 3H4-oxocarbenium, which is in equilibrium with a bridged sulfonium intermediate.

  当6-硫-6-脱氧甘露糖供体进行缩合时，会高度立体选择性地得到1,2-顺式产物。随后通过还原性移除6-硫功能基团，生成1,2-顺式鼠李糖苷。1,2-顺式选择性可通过生成产物形式的3H4-氧碳鎓离子来合理化，这一离子与桥连的硫鎓中间体处于平衡状态。
• Tin-Mediated Regioselective Benzylation and Allylation of Polyols: Applicability of a Catalytic Approach Under Solvent-Free Conditions
  作者：Maddalena Giordano、Alfonso Iadonisi

  DOI：10.1021/jo402399n

  日期：2014.1.3

  The first catalytic version of the stannylene-mediated benzylation and allylation of polyols is reported. The methodology is based on a simple solvent-free protocol that significantly advances, in terms of both experimental ease and synthetic scope, the applicability of tin-promoted selective protections. The described approach is indeed endowed with a very large number of advantages over routine protocols:

  报道了由亚苯乙烯介导的多元醇的苄基化和烯丙基化的第一个催化形式。该方法基于简单的无溶剂方案，在实验简便性和合成范围方面，都大大提高了锡促进的选择性保护的适用性。与常规方案相比，所描述的方法确实具有许多优点：使用低催化负载量的廉价Bu 2SnO是避免使用溶剂的一步法工艺，是在空气中进行反应的最低要求的实验程序，缩短了反应时间，简化了后处理工艺，目标范围广，在许多情况下，收率均优于常规协议。另外，无催化溶剂的方法将亚锡烷基化学的范围扩展到了空前的应用领域，以还原糖和合成高苄基化的结构单元，而这些过程可以通过更苛刻的程序来获得。从概念的角度来看，所描述的结果表明，无溶剂条件可以帮助开发催化方法，否则该方法在溶液中无效。
• Dimethyltin Dichloride Catalyzed Regioselective Alkylation of<i>cis</i>-1,2-Diols at Room Temperature
  作者：Varma Saikam、Saidulu Dara、Mahipal Yadav、Parvinder Pal Singh、Ram A. Vishwakarma

  DOI：10.1021/acs.joc.5b01898

  日期：2015.12.18

  mild and general method for the regioselective installation of benzyl, allyl, para-methoxybenzyl and naphthyl groups on cis-1,2-diols. The optimized method operates at room temperature using dimethyltin dichloride as catalyst and silver oxide as an additive. The present method works well with both sugars (such as mono- and disaccharides) and nonsugars (such as inositols, propan-1,2-diol, 1,2-cycloalkanediols

  在这里，我们已经开发出一种温和的通用方法，用于在顺式-1，2-二醇上区域选择性地安装苄基，烯丙基，对甲氧基苄基和萘基。该优化方法在室温下使用二氯化二甲基锡作为催化剂，氧化银作为添加剂进行操作。本方法对于糖类（例如单糖和二糖）和非糖类（例如肌醇，1，2-丙二醇，1,2-环烷二醇和脱水赤藓糖醇）均适用，并且还提供了相对更好的官能团相容性。