1-<(Benzyloxy)methyl>-2,4,5-triiodoimidazole | 134420-44-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 1-<(Benzyloxy)methyl>-2,4,5-triiodoimidazole
• 英文别名: 1-<(benzyloxy)methyl>-2,4,5-triodoimidazole；2,4,5-Triiodo-1-(phenylmethoxymethyl)imidazole
• CAS: 134420-44-3
• 化学式: C₁₁H₉I₃N₂O
• 分子量: 565.919
• InChiKey: CEYZKDWPXOUDDM-UHFFFAOYSA-N

物化性质

• 熔点：
  129-131 °C(Solv: acetone (67-64-1); water (7732-18-5))
• 沸点：
  514.0±60.0 °C(Predicted)
• 密度：
  2.48±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.4
• 重原子数：
  17
• 可旋转键数：
  4
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.18
• 拓扑面积：
  27
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  1-<(Benzyloxy)methyl>-2,4,5-triiodoimidazole 在 正丁基锂 作用下， 反应 3.0h， 生成 1-<(Benzyloxy)methyl>-4-iodo-2-(phenylthio)imidazole-5-carboxaldehyde
  参考文献：
  名称：

  Multifunctionalization of imidazole via sequential halogen-metal exchange: a new route to purine-ring analogs

  摘要：

  A new method for the synthesis of purine-ring analogs based upon the sequential halogen-metal exchange functionalization of 1-[(benzyloxy)methyl]-2,4,5-triiodoimidazole (1) has been developed and is illustrated by the synthesis of (1H)-imidazo[4,5-d]pyridazin-4(5H)-one (2-aza-3-deazahypoxanthine, 8). Treatment of 1 with BuLi followed by quench with PhSSPh afforded the 2-(phenylthio) derivative, which upon treatment with BuLi followed by quench with DMF gave the 5-carboxaldehyde. This aldehyde was converted into its ethylene acetal, which was treated with BuLi followed by quench with ClCO2CH3 to afford a 4-(methoxycarbonyl)imidazole. Removal of the phenylthio group with Al(Hg) and the (benzyloxy)methyl and ethylene acetal protecting groups concomitantly with 3 M HCl afforded methyl 5(4)-formylimidazole-4(5)-carboxylate, which underwent cyclo-condensation with ethanolic NH2NH2 to give target 8. This synthetic approach was found amenable to modification by efficient ''one-pot'' multistep transformations. Thus, treatment of 1 with (a) BuLi, (b) (CH3)3SiCl, (c) BuLi, (d) (CH3)2NN(CH3)CHO, (e) BuLi, and (f) (CH3OCO)2O afforded the N-protected 4-(methoxycarbonyl)-imidazole-5-carboxaldehyde (13) in 25% yield directly from 1. Imidazole 13 was then elaborated to 8 in two steps. 1-Formyl-1,2,2-trimethylhydrazine is a recommended replacement for DMF as a tandem formylating/ortho-metalation directing agent.

  DOI：

  10.1021/jo00040a011
• 作为产物：
  描述：

  2,4,5-三碘咪唑 、 苄基氯甲基醚 在 potassium carbonate 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 以83%的产率得到1-<(Benzyloxy)methyl>-2,4,5-triiodoimidazole
  参考文献：
  名称：

  Regioselective formation of imidazol-2-yllithium, imidazol-4-yllithium, and imidazol-5-yllithium species

  摘要：

  Representative imidazol-2-yllithium, imidazol-4-yllithium, and imidazol-5-yllithium species have been prepared via halogen-metal exchange, and the propensity of the latter two to undergo isomerization and quench by electrophilic reagents has been studied. The C2-unsubstituted imidazol-5-yllithium species 3 is generated within 10 min at -78-degrees-C from 1-[(benzyloxy)methyl]-4,5-diiodoimidazole (1b) and affords the C5-formyl product 4 upon reaction with DMF, but gives the isomeric C2-formyl product 6 if allowed to equilibrate to the imidazol-2-yllithium species 5 for an additional 35 min at -78-degrees-C before quench. The less reactive electrophile diethyl carbonate is unable to trap 3 and instead reacts with 5 to afford tris[1-[(benzyloxy)methyl]-4-iodo-2-imidazolyl]carbinol (7). In contrast, 1-[(benzyloxy)methyl]-4-iodoimidazole-5-carboxaldehyde ethylene acetal (10) metalates to give the C2-unsubstituted imidazol-4-yllithium species 13, which undergoes a very rapid conversion to its imidazol-2-yllithium isomer 14, even at -100-degrees-C, giving the 2,5-dicarboxaldehyde 5-ethylene acetal 16 or the 2-deuterio-5-carboxaldehyde ethylene acetal 15 upon quench with DMF or D2O, respectively. Thus, in the presence of C2 unsubstitution, C5 functionalization could be accomplished when the electrophile was sufficiently reactive, while C4 functionalization could not. Short- and long-range H-1-C-13 heteronuclear (Hector) 2D NMR spectroscopic analyses were instrumental in the structural assignments of key compounds.

  DOI：

  10.1021/jo00013a042

文献信息

• GROZIAK, MICHAEL P.;WEI, LULIN, J. ORG. CHEM., 56,(1991) N3, C. 4296-4300
  作者：GROZIAK, MICHAEL P.、WEI, LULIN

  DOI：——

  日期：——

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