4-ethyl-2-pyridinesulfonic acid | 147540-89-4

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 有机磺酸及其衍生物
• 英文名称: 4-ethyl-2-pyridinesulfonic acid
• 英文别名: 4-ethylpyridine-2-sulfonic acid
• CAS: 147540-89-4
• 化学式: C₇H₉NO₃S
• 分子量: 187.219
• InChiKey: KLIHFLITAJWPMH-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.7
• 重原子数：
  12
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.29
• 拓扑面积：
  75.6
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  4-ethyl-2-pyridinesulfonic acid 在 fluorine 作用下， 以 乙腈 为溶剂， 以79%的产率得到N-fluoro-4-ethylpyridinium-2-sulfonate
  参考文献：
  名称：

  Highly Selective Fluorinating Agents: a Counteranion-Bound N-Fluoropyridinium Salt System

  摘要：

  A series of alkyl- or (trifluoromethyl)-substituted N-fluoropyridinium-2-sulfonates 2a-h, differing in fluorinating power, were synthesized, and assessment was made of the effectiveness of each selective fluorinating agent. N-Fluoropyridinium-3- and -4-sulfonates 3 and 4 were also synthesized. Power-variables 2a-h were found to be highly selective fluorinating agents for a wide range of nucleophilic substrates such as activated aromatics, enol trialkylsilyl and alkyl ethers, active methylene compounds, activated olefins, and sulfides. Thus, phenol, naphthol, phenylurethane, and the trimethylsilyl ether of phenol were exclusively or highly selectively fluorinated at the o-position with 2f-h. Conjugated enol trialkylsilyl ethers of a steroid were regioselectively fluorinated at the 6-position with moderately powerful 2b-e. This regioselectivity increased with the bulkiness of the silyl part, and with the most bulky triisopropylsilyl group exclusive B-fluorination was achieved. Preferential beta-stereoselective fluorination at the 6-position was observed. N-Fluoropyridinium-2-sulfonates were activated with an acid. This acid-catalyzed fluorination led to the preferential p-fluorination of anisole. The present results can be explained based on the capacity of the 2-sulfonate anion to interact with the hydroxy group of phenol or naphthol, NH group of phenylurethane, silicon atoms of silyl ethers, or protons of acids.

  DOI：

  10.1021/jo00125a049

文献信息

• Novel substituted N-Fluoropyridiniumsulfonate, intermediates therefor and preparation processes thereof
  申请人：DAIKIN INDUSTRIES, LTD.

  公开号：EP0526849A1

  公开（公告）日：1993-02-10

  A substituted N-fluoropyridiniumsulfonate of the formula: in which R1 is a hydrogen atom, a halogen atom or a C1-C4 alkyl or haloalkyl group, and R2 is a C1-C4 alkyl or haloalkyl group, which is an effective fluorinating agent.

  一种取代的 N-氟吡啶鎓磺酸盐，其式如下 其中 R1 是氢原子、卤素原子或 C1-C4 烷基或卤代烷基，R2 是 C1-C4 烷基或卤代烷基，它是一种有效的氟化剂。
• Substituted N-Fluoropyridiniumsulfonate, intermediates therefor and preparation processes thereof
  申请人：DAIKIN INDUSTRIES, LTD.

  公开号：EP0526849B1

  公开（公告）日：1999-12-01
• US5374732A
  申请人：——

  公开号：US5374732A

  公开（公告）日：1994-12-20