ethyl 4-O-methyl-1-thio-α-L-rhamnopyranoside | 146399-56-6

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: ethyl 4-O-methyl-1-thio-α-L-rhamnopyranoside
• CAS: 146399-56-6
• 化学式: C₉H₁₈O₄S
• 分子量: 222.306
• InChiKey: RHSNIGROIXRPMM-PQFOHKHZSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.22
• 重原子数：
  14.0
• 可旋转键数：
  3.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  58.92
• 氢给体数：
  2.0
• 氢受体数：
  5.0

反应信息

• 作为反应物：
  描述：

  ethyl 4-O-methyl-1-thio-α-L-rhamnopyranoside 在 吡啶 、 N-碘代丁二酰亚胺 、 三氟甲磺酸 、 4 A molecular sieve 、 二正丁基氧化锡 、 cesium fluoride 、 2,3-二氯-5,6-二氰基-1,4-苯醌 、 sodium iodide 作用下， 以 二氯甲烷 、 水 为溶剂， 反应 22.83h， 生成 3-(Benzyloxycarbonylamino)propyl 2,4-di-O-benzoyl-3-O-(2-O-benzoyl-4-O-methyl-α-L-rhamnopyranosyl)-α-L-rhamnopyranoside
  参考文献：
  名称：

  Synthesis of Haptenic Trimers Corresponding to the Cell Wall Glycopeptidolipids ofMycobacterium AviumSerovar 12

  摘要：

  The preparation of the spacer-containing trimers 2, 3-aminopropyl 3-O-[4-O-Me-3-O-(4-N-D,L-lactoyl-3-O-Me-beta-D-Quip)-alpha-L-Rhap]-alpha-L-Rhap, derivatives of the antigenic determinant of the glycopeptidolipid from Mycobacterium avium serotype 12, are described. Thus, iodonium ion-mediated glycosylation of the spacer-containing acceptor 7 with ethyl 1-thio-rhamnopyranoside donor 10, followed try selective deprotection of the p-methoxybenzyl group of thus obtained 19 gave bis-rhamnopyranoside acceptor 20. Elongation of 20 with ethyl 4-azido-1-thio-beta-D-quinovopyranoside 18 and subsequent reduction of the azido function in 21 led to trimer 22. The amino group in 22 was coupled with both D- and L-lactic acid to give, after removal of the protective groups, trimers 2.

  DOI：

  10.1080/07328309608005677
• 作为产物：
  描述：

  (3aR,4S,6S,7S,7aR)-4-Ethylsulfanyl-7-methoxy-2,2,6-trimethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran 在 溶剂黄146 作用下， 反应 17.0h， 生成 ethyl 4-O-methyl-1-thio-α-L-rhamnopyranoside
  参考文献：
  名称：

  Iodonium ion-assisted synthesis of a haptenic tetrasaccharide fragment corresponding to the inner cell-wall glycopeptidolipid of Mycobacterium avium serotype 4

  摘要：

  Condensation of ethyl 2,4-di-O-benzoyl-1-thio-alpha-L-rhamnopyranoside with ethyl 3-O-benzyl-4-O-chloroacetyl-2-O-methyl-1-thio-beta-L-fucopyranoside in the presence of iodonium di-sym-collidine perchlorate afforded exclusively ethyl 2,4-di-O-benzoyl-3-O-(3-O-benzyl-4-O-chloroacetyl-2-O-methyl-alpha-L-fucopyranosyl)-1-thio-alpha-L-rhamnopyranoside. This disaccharide derivative was extended at C-1 with 3-benzyloxycarbonylaminopropyl 6-deoxy-3,4-O-isopropylidene-alpha-L-talopyranoside, using N-iodosuccinimide and triflic acid as the catalyst, to furnish 3-benzyloxycarbonylaminopropyl 6-deoxy-2-O[2,4-di-O-benzoyl-3-O-(3-O-benzyl-4-O-chloroacetyl-2-O-methyl-alpha-L-fucopyranosyl)-alpha-L-rhamnopyranosyl]-3,4-0-isopropylidene-alpha-L-talopyranoside (20). Selective removal of the chloroacetyl group from 20, followed by condensation with ethyl 2,3-di-O-benzoyl-4-O-methyl-1-thio-alpha-L-rhamnopyranoside in the presence of the same thiophilic promoter, yielded a fully protected tetrasaccharide derivative. Deprotection of the latter gave the target compound 3-aminopropyl 6-deoxy-2-O-{3-O-[2-O-methyl-(4-O-methyl-alpha-L-rhamnopyranosyl)-alpha-L-fucopyranosyl]-alpha-L-rhamnopyranosyl}alpha-L-talopyranoside (1).

  DOI：

  10.1016/0008-6215(93)80102-k

文献信息

• Iodonium ion-assisted synthesis of a tetrameric fragment corresponding to the cell wall phenolic glycolipids of Mycobacterium kansasii serovar I
  作者：Korien Zegelaar-Jaarsveld、Sander A.W. Smits、Nicole C.R. van Straten、Gijs A. van der Marel、Jacques H. van Boom

  DOI：10.1016/0040-4020(96)00035-x

  日期：1996.3

  Two procedures are described towards the assembly of the tyramine spacer-containing tetramer 5, a derivative of the phenolic glycolipid of Mycobacterium kansasii serovar I. First, iodonium ion-mediated glycosylation of trimeric acceptor 2a with D-rhamnopyranoside donor 10 gave fully protected tetramer 17. Selective removal of the chloroacetyl group of 17, subsequent deoxygenation and removal of the protective groups, led to target 5. The potential occurrence of double stereodifferentiation (DSD) was examined by condensation of L-fucopyranoside model acceptor 14 with both the enantiomeric rhamnopyranoside donors 10 and 13. The second procedure involves elongation of trimeric acceptor 2b with 6-deoxy-D-glucopyranoside 28. Desulfurisation of the resulting tetrameric fragment 36 followed by hydrogenation of 37 gave 38, the phenylacetyl (PhAc) of which was enzymatically removed to yield target tetramer 5.
• Iodonium ion assisted synthesis of a common inner core trisaccharide fragment corresponding to the cell-wall phenolic glycolipid of Mycobacterium kansasii
  作者：Korien Zegelaar-Jaarsveld、Gijs A. van der Marel、Jacues H. van Boom

  DOI：10.1016/s0040-4020(01)89043-8

  日期：——

  The spacer containing trimer 4-(aminoethyl)phenyl 2,4-di-O-Me-3-O-[2-O-methyl-3-O-(4-O-acetyl-2-O-methyl-alpha-L-fucopyranosyl)-alpha-L-rhamnopyranosyl]-alpha-L-rhamnopyranoside (2) was prepared by stepwise extension of 4-[2-(benzyloxycarbonyl-amino)ethyl]phenyl 2,4-di-O-methyl-alpha-L-rhamnopyranoside (19) with property protected ethyl thioglycosides of L-rhamnose 8 and L-fucose 12 or 16 using iodonium ions as promotors. The resulting trimers 22 or 23 were deblocked in two steps to give homogeneous 2. Alternatively, fully protected trimer 22 was assembled by iodonium ion assisted condensation of the phenyl 1-thio-alpha-L-rhamnopyranoside 29 with 12 followed by extension of dimer 31 with 19.