Ethyl 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-1-thio-α-D-glucopyranoside | 151123-94-3

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: Ethyl 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-1-thio-α-D-glucopyranoside
• CAS: 151123-94-3
• 化学式: C₂₄H₂₅ClO₇S
• 分子量: 492.977
• InChiKey: WKEIPTZVRMKNNK-UMYLDQLOSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.95
• 重原子数：
  33.0
• 可旋转键数：
  7.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.42
• 拓扑面积：
  80.29
• 氢给体数：
  0.0
• 氢受体数：
  8.0

反应信息

• 作为反应物：
  描述：

  Ethyl 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-1-thio-α-D-glucopyranoside 在 2,6-二甲基吡啶 、 2,6-二叔丁基-4-甲基吡啶 、 4 A molecular sieve 、 silver trifluoromethanesulfonate 、 silver perchlorate 、 氯 、 硫脲 、 silver carbonate 作用下， 以 甲醇 、 四氯化碳 、 二氯甲烷 、 氯仿 、 甲苯 为溶剂， 反应 7.08h， 生成 Methyl O-(2-O-benzoyl-4,6-O-benzylidene-β-D-glucopyranosyl)-(1->3)-2-O-benzoyl-4,6-O-benzylidene-β-D-glucopyranoside
  参考文献：
  名称：

  Synthesis of the laminara-oligosaccharide methyl β-glycosides of dp 3–8

  摘要：

  Ethyl 2,3,4,6-tetra-O-acetyl-l-thio-alpha-D-glucopyranoside has been prepared in a good yield by anomerization of the corresponding beta-thioglucoside with tin(IV) chloride and transformed, in three steps, into ethyl 2-O-benzoyl-4,6-O-benzylidene-1-thio-alpha-D-glucopyranoside (18). Chloroacetylation of 18, followed by treatment of the product with chlorine gave crystalline 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-beta-D-glucopyranosyl chloride (20). This was coupled with methanol in the presence of silver carbonate-silver perchlorate and the product was O-dechloroacetylated to afford methyl 2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranoside (22). Silver triflate-promoted glucosylation of 18 with 20 gave a beta-(1 --> 3)-linked disaccharide derivative, reaction of which with chlorine yielded crystalline O-(2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-beta-D-glucopyranosyl)-(1 --> 3)-2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranosyl chloride (24). Likewise, condensation of 22 with 20 gave a beta-(1 --> 3)-linked disaccharide glycoside, which was partially deprotected to give methyl O-(2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranosyl)-(1 --> 3)-2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranoside (26). The methyl beta-glycosides of a homologous series of (1 --> 3)-linked beta-D-gluco-Oligosaccharides from the tri- to the octa-saccharide have been synthesized in a blockwise manner by using 22 and 26 as the glycosyl acceptors, 24 as the disaccharide donor, and silver triflate as the promoter.

  DOI：

  10.1016/0008-6215(93)80061-i
• 作为产物：
  描述：

  ethyl 2,3,4,6-tetra-O-acetyl-1-thio-α-D-glycopyranoside 在 吡啶 、 sodium methylate 、 对甲苯磺酸 、 三乙胺 作用下， 以 甲醇 、 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， 50.0 ℃ 、4.0 kPa 条件下， 反应 7.33h， 生成 Ethyl 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-1-thio-α-D-glucopyranoside
  参考文献：
  名称：

  Synthesis of the laminara-oligosaccharide methyl β-glycosides of dp 3–8

  摘要：

  Ethyl 2,3,4,6-tetra-O-acetyl-l-thio-alpha-D-glucopyranoside has been prepared in a good yield by anomerization of the corresponding beta-thioglucoside with tin(IV) chloride and transformed, in three steps, into ethyl 2-O-benzoyl-4,6-O-benzylidene-1-thio-alpha-D-glucopyranoside (18). Chloroacetylation of 18, followed by treatment of the product with chlorine gave crystalline 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-beta-D-glucopyranosyl chloride (20). This was coupled with methanol in the presence of silver carbonate-silver perchlorate and the product was O-dechloroacetylated to afford methyl 2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranoside (22). Silver triflate-promoted glucosylation of 18 with 20 gave a beta-(1 --> 3)-linked disaccharide derivative, reaction of which with chlorine yielded crystalline O-(2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-beta-D-glucopyranosyl)-(1 --> 3)-2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranosyl chloride (24). Likewise, condensation of 22 with 20 gave a beta-(1 --> 3)-linked disaccharide glycoside, which was partially deprotected to give methyl O-(2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranosyl)-(1 --> 3)-2-O-benzoyl-4,6-O-benzylidene-beta-D-glucopyranoside (26). The methyl beta-glycosides of a homologous series of (1 --> 3)-linked beta-D-gluco-Oligosaccharides from the tri- to the octa-saccharide have been synthesized in a blockwise manner by using 22 and 26 as the glycosyl acceptors, 24 as the disaccharide donor, and silver triflate as the promoter.

  DOI：

  10.1016/0008-6215(93)80061-i

文献信息

• Convergent Total Syntheses of Oligosaccharides by One-Pot Sequential Stereoselective Glycosylations
  作者：Takashi Hashihayata、Kazuhiro Ikegai、Kazuya Takeuchi、Hideki Jona、Teruaki Mukaiyama

  DOI：10.1246/bcsj.76.1829

  日期：2003.9

  amino acid 7 with thioglycoside 6 was successfully carried out by combining trityl trifluoromethanesulfonate (TrOTf) and N-iodosuccimide (NIS) which gave glycosyl amino acid 21 in high yield (97%, α/β = 83⁄17). Next, the glycosylation of thioglycoside 4 with galactosyl phenyl carbonate 2 or fluoride 3 was tried by the promotion of trityl tetrakis(pentafluorophenyl)borate [TrB(C6F5)4] or trifluoromethanesulfonic

  F1α 抗原是肿瘤相关 O 联粘蛋白糖基氨基酸的一个成员，通过一锅序贯糖基化进行了会聚全合成。通过结合三氟甲磺酸三苯甲基酯 (TrOTf) 和 N-碘代琥珀酰亚胺 (NIS) 成功地进行了氨基酸 7 与硫糖苷 6 的高度 α 选择性糖基化，以高产率 (97%, α/β = 83⁄17) 得到糖基氨基酸 21 ）。接下来，通过三苯甲基四(五氟苯基)硼酸酯[TrB(C6F5)4]或三氟甲磺酸(TfOH)的促进，尝试了硫代糖苷4与半乳糖苯基碳酸酯2或氟化物3的糖基化；通过进一步添加糖基氨基酸 5 和 NIS，分别以 80% 或 89% 的总产率提供受保护的 F1α 25。去除保护基团后以高产率获得所需的三糖。下一个，