2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranosyl 2,2,2-trichloroacetamidate | 255894-68-9

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: 2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranosyl 2,2,2-trichloroacetamidate
• 英文别名: 2,3,4-Tri-O-acetyl-α-L-rhamnopyranosyl-(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranosyl trichloroacetimidate；Rha2Ac3Ac4Ac(a1-3)[Bz(-2)][Bz(-4)]Rha(a)-O-C(NH)CCl3；[(2S,3S,4R,5R,6S)-5-benzoyloxy-2-methyl-4-[(2S,3R,4R,5S,6S)-3,4,5-triacetyloxy-6-methyloxan-2-yl]oxy-6-(2,2,2-trichloroethanimidoyl)oxyoxan-3-yl] benzoate
• CAS: 255894-68-9
• 化学式: C₃₄H₃₆Cl₃NO₁₄
• 分子量: 789.017
• InChiKey: NAZZYDHSAKGFIL-RCMWWLKMSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.5
• 重原子数：
  52
• 可旋转键数：
  16
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.47
• 拓扑面积：
  192
• 氢给体数：
  1
• 氢受体数：
  15

反应信息

• 作为反应物：
  描述：

  2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranosyl 2,2,2-trichloroacetamidate 在 三氟甲磺酸三甲基硅酯 、 氨 作用下， 以 甲醇 、 二氯甲烷 为溶剂， 反应 50.0h， 生成 methyl α-L-rhamnopyranosyl-(1->3)-α-D-rhamnopyranosyl-(1->2)-α-L-rhamnopyranosyl-(1->2)-α-L-rhamnopyranoside
  参考文献：
  名称：

  Synthesis of an l-rhamnose tetrasaccharide, the common and major structure of the repeating unit of the O-antigenic polysaccharide of a strain of Klebsiella pneumoniae and Pseudomonas holci

  摘要：

  A tetrasaccharide, alpha -L-Rhap-(1 -->3)-alpha -L-Rhap-(1 -->2)-alpha -L-Rhap-(1 --> 2)-L-Rhap, the common and major structure of the repeating unit of the O-antigenic polysaccharide of a strain of Klebsiella pneumoniae and Pseudomonas holci was synthesized as its methyl and octyl glycosides. Selective 3-O-glycosylation of allyl alpha -L-rhamnopyranoside with 2,3,4-tri-O-acetyl-alpha -L-rhamnopyranosyl trichloroacetimidate gave allyl 2,3,4-tri-O-acetyl-alpha -L-rhamnopyranosyl-(1 --> 3)-alpha -L-rhamnopyranoside (3). Benzoylation, deallylation, and trichloroacetimidation afforded 2,3,4-tri-O-acetyl-alpha -L-rhamnopyranosyl-(1 --> 3)-2,4-di-O-benzoyl-alpha -L-rhamnopyranosyl trichloroacetimidate (6). Self condensation of 3,4-di-O-benzoyl-beta -L-rhamnopyranose 1,2-methyl orthoester or 1,2-octyl orthoester gave methyl or octyl 2-O-acetyl-3,4-di-O-benzoyl-alpha -L-rhamnopyranosyl-(1 -->2)-3,4-di-O-benzOyl-alpha -L-rhamnopyranoside (16 or 17), and subsequent selective deacetylation gave the disaccharide acceptor (18 or 19). Coupling of 6 with 18 (or 19), followed by deacylation in ammonia-saturated methanol, produced the target tetrasacharide. (C) 2001 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0008-6215(01)00258-0
• 作为产物：
  描述：

  allyl 2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl(1->3)-α-L-rhamnopyranoside 在 吡啶 、 sodium acetate 、 1,8-二氮杂双环[5.4.0]十一碳-7-烯 、 palladium dichloride 作用下， 以 二氯甲烷 、 溶剂黄146 为溶剂， 反应 14.0h， 生成 2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranosyl 2,2,2-trichloroacetamidate
  参考文献：
  名称：

  Synthesis of an l-rhamnose tetrasaccharide, the common and major structure of the repeating unit of the O-antigenic polysaccharide of a strain of Klebsiella pneumoniae and Pseudomonas holci

  摘要：

  A tetrasaccharide, alpha -L-Rhap-(1 -->3)-alpha -L-Rhap-(1 -->2)-alpha -L-Rhap-(1 --> 2)-L-Rhap, the common and major structure of the repeating unit of the O-antigenic polysaccharide of a strain of Klebsiella pneumoniae and Pseudomonas holci was synthesized as its methyl and octyl glycosides. Selective 3-O-glycosylation of allyl alpha -L-rhamnopyranoside with 2,3,4-tri-O-acetyl-alpha -L-rhamnopyranosyl trichloroacetimidate gave allyl 2,3,4-tri-O-acetyl-alpha -L-rhamnopyranosyl-(1 --> 3)-alpha -L-rhamnopyranoside (3). Benzoylation, deallylation, and trichloroacetimidation afforded 2,3,4-tri-O-acetyl-alpha -L-rhamnopyranosyl-(1 --> 3)-2,4-di-O-benzoyl-alpha -L-rhamnopyranosyl trichloroacetimidate (6). Self condensation of 3,4-di-O-benzoyl-beta -L-rhamnopyranose 1,2-methyl orthoester or 1,2-octyl orthoester gave methyl or octyl 2-O-acetyl-3,4-di-O-benzoyl-alpha -L-rhamnopyranosyl-(1 -->2)-3,4-di-O-benzOyl-alpha -L-rhamnopyranoside (16 or 17), and subsequent selective deacetylation gave the disaccharide acceptor (18 or 19). Coupling of 6 with 18 (or 19), followed by deacylation in ammonia-saturated methanol, produced the target tetrasacharide. (C) 2001 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0008-6215(01)00258-0

文献信息

• Synthesis of a group of diosgenyl saponins with combined use of glycosyl trichloroacetimidate and thioglycoside donors
  作者：Hai Yu、Biao Yu、Xiangyang Wu、Yongzheng Hui、Xiuwen Han

  DOI：10.1039/a909218h

  日期：——

  With the combined use of glycosyl trichloroacetimidates and thioglycosides, a group of natural diosgenyl saponins (1–6) are efficiently synthesized, in either a stepwise or a ‘one-pot’ manner. The trichloroacetimidate is employed as an efficient temporary hydroxy protecting group in glycosylation with the glycosyl trichloroacetimidate. The intermolecular alkylthio-group transfer is demonstrated to be a common side-reaction during glycosylation with thioglycosides.

  通过结合使用糖基三氯乙亚胺酯和硫代糖苷，一系列天然薯蓣皂苷元的皂苷（1-6）被高效地合成，无论是逐步合成还是“一锅法”合成。三氯乙亚胺酯作为糖基化反应中糖基三氯乙亚胺酯的临时羟基保护组，表现出高效性。硫代糖苷参与的糖基化反应中，分子的烷硫基转移被证实是一种常见的副反应。
• Synthesis of a group of diosgenyl saponins by a one-pot sequential glycosylation
  作者：Biao Yu、Hai Yu、Yongzheng Hui、Xiuwen Han

  DOI：10.1016/s0040-4039(99)01839-0

  日期：1999.12

  A group of natural diosgenyl saponins was synthesized in a highly efficient manner employing the 'one-pot sequential glycosylation' protocol with the combined use of glycosyl trichloroacetimidates and thioglycosides. (C) 1999 Elsevier Science Ltd. All rights reserved.