octyl 2,4,6-tri-O-benzoyl-3-O-benzyl-β-D-mannopyranoside | 205869-90-5

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: octyl 2,4,6-tri-O-benzoyl-3-O-benzyl-β-D-mannopyranoside
• 英文别名: [(2R,3R,4S,5S,6R)-3,5-dibenzoyloxy-6-octoxy-4-phenylmethoxyoxan-2-yl]methyl benzoate
• CAS: 205869-90-5
• 化学式: C₄₂H₄₆O₉
• 分子量: 694.822
• InChiKey: LVBGFZVEEOPPPQ-GTHXHSJHSA-N

物化性质

• 沸点：
  756.1±60.0 °C(Predicted)
• 密度：
  1.22±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  9.5
• 重原子数：
  51
• 可旋转键数：
  21
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  107
• 氢给体数：
  0
• 氢受体数：
  9

反应信息

• 作为反应物：
  描述：

  octyl 2,4,6-tri-O-benzoyl-3-O-benzyl-β-D-mannopyranoside 在 4 A molecular sieve 、 sodium methylate 、 mercury dibromide 作用下， 以 甲醇 、 二氯甲烷 为溶剂， 反应 28.75h， 生成 octyl 2-O-benzoyl-3-O-benzyl-6-O-(2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl)-β-D-mannopyranoside
  参考文献：
  名称：

  4,6-di-O-benzoyl-3-O-benzyl-α-d-arabino-hexopyranos-2-ulosyl bromide: A conveniently accessible glycosyl donor for the expedient construction of diantennary β-d-mannosides branched at O-3 and O-6

  摘要：

  A concise practical, large scale-adaptable six-step sequence has been developed for the transformation of diacetone-glucose into 4,6-di-O-benzoyl-3-O-benzyl-alpha-D-arabino-hexo-pyranos-2 -ulosyl bromide (7), a most useful indirect beta-D-mannosyl donor as its blocking group pattern allows the construction of biologically relevant beta-D-mannosides branched at O-3 and O-6. The broad utility of this new ulosyl bromide 7 resides in its high anomeric reactivity, and in the ease and uniformity with which beta-stereocontrol can be achieved over both, glycosidations and carbonyl reduction of the beta-ulosides formed: Koenigs-Knorr conditions exclusively provide beta-glycosiduloses, hydride reduction of their carbonyl functions proceeds with high stereoselectivities (> 20:1) in favor of the beta-D-mannosides, These preparatively auspicious properties are materialized in an efficient, straightforward synthesis of alpha-D-Manp-(1 --> 6)-[alpha-D-Manp-(1 --> 3)]-beta-D-Manp-(1 --> O)-Octyl, the 3,6-O-branched core-mannotrioside carrying an octyl spacer instead of the chitobiosyl unit. (C) 1998 Elsevier Science Ltd.

  DOI：

  10.1016/s0008-6215(97)00249-8
• 作为产物：
  描述：

  3-O-benzyl-1,2;5,6-di-O-isopropylidene-α-D-glucofuranoside 在 吡啶 、 sodium tetrahydroborate 、 N-溴代丁二酰亚胺(NBS) 、 乙醇 、 4 A molecular sieve 、 Dowex 50 (H⁽¹⁺⁾) 、 氢溴酸 、 溶剂黄146 、 1,8-二氮杂双环[5.4.0]十一碳-7-烯 、 silver carbonate 作用下， 以 二氯甲烷 、 氯仿 、 水 为溶剂， 反应 29.75h， 生成 octyl 2,4,6-tri-O-benzoyl-3-O-benzyl-β-D-mannopyranoside
  参考文献：
  名称：

  4,6-di-O-benzoyl-3-O-benzyl-α-d-arabino-hexopyranos-2-ulosyl bromide: A conveniently accessible glycosyl donor for the expedient construction of diantennary β-d-mannosides branched at O-3 and O-6

  摘要：

  A concise practical, large scale-adaptable six-step sequence has been developed for the transformation of diacetone-glucose into 4,6-di-O-benzoyl-3-O-benzyl-alpha-D-arabino-hexo-pyranos-2 -ulosyl bromide (7), a most useful indirect beta-D-mannosyl donor as its blocking group pattern allows the construction of biologically relevant beta-D-mannosides branched at O-3 and O-6. The broad utility of this new ulosyl bromide 7 resides in its high anomeric reactivity, and in the ease and uniformity with which beta-stereocontrol can be achieved over both, glycosidations and carbonyl reduction of the beta-ulosides formed: Koenigs-Knorr conditions exclusively provide beta-glycosiduloses, hydride reduction of their carbonyl functions proceeds with high stereoselectivities (> 20:1) in favor of the beta-D-mannosides, These preparatively auspicious properties are materialized in an efficient, straightforward synthesis of alpha-D-Manp-(1 --> 6)-[alpha-D-Manp-(1 --> 3)]-beta-D-Manp-(1 --> O)-Octyl, the 3,6-O-branched core-mannotrioside carrying an octyl spacer instead of the chitobiosyl unit. (C) 1998 Elsevier Science Ltd.

  DOI：

  10.1016/s0008-6215(97)00249-8