tert-butyl 4-(benzo[c]isoxazol-5-yl)piperazine-1-carboxylate | 1395101-73-1

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二嗪烷类
• 英文名称: tert-butyl 4-(benzo[c]isoxazol-5-yl)piperazine-1-carboxylate
• 英文别名: Tert-butyl 4-(2,1-benzoxazol-5-yl)piperazine-1-carboxylate；tert-butyl 4-(2,1-benzoxazol-5-yl)piperazine-1-carboxylate
• CAS: 1395101-73-1
• 化学式: C₁₆H₂₁N₃O₃
• 分子量: 303.361
• InChiKey: KTUDFXWANORDCE-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  22
• 可旋转键数：
  3
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.5
• 拓扑面积：
  58.8
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为产物：
  描述：

  tert-butyl 4-(3-formyl-4-nitrophenyl)piperazine-1-carboxylate 在 tin(II) chloride dihdyrate 作用下， 以 甲醇 、 乙酸乙酯 为溶剂， 反应 20.0h， 以83%的产率得到tert-butyl 4-(benzo[c]isoxazol-5-yl)piperazine-1-carboxylate
  参考文献：
  名称：

  One-pot synthesis of 2,1-benzisoxazoles (anthranils) by a stannous chloride-mediated tandem reduction–heterocyclization of 2-nitroacylbenzenes under neutral conditions

  摘要：

  Classically, 2,1-benzisoxazoles (anthranils) are prepared from 2-nitroacylbenzenes by a reductive heterocyclization reaction with Sn or SnCl2 concentrated HCl. Acid sensitive functionalities are expected to be incompatible with these conditions; milder approaches to the synthesis of 2,1-benzisoxazoles would be welcomed. We demonstrate that SnCl2 center dot 2H(2)O in a 1:1 mixture of EtOAc/MeOH is capable of mediating the tandem reduction-heterocyclization of a variety of 2-nitroacylbenzenes to their corresponding 2,1-benzisoxazoles in good to excellent yields under essentially neutral conditions. Importantly, several commonly used acid-labile protecting groups, including Boc carbamate, tert-butyl ether, and tert-butyl ester, proved orthogonal to these reaction conditions. (C) 2012 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetlet.2012.07.006

文献信息

• One-pot synthesis of 2,1-benzisoxazoles (anthranils) by a stannous chloride-mediated tandem reduction–heterocyclization of 2-nitroacylbenzenes under neutral conditions
  作者：Jay Chauhan、Steven Fletcher

  DOI：10.1016/j.tetlet.2012.07.006

  日期：2012.9

  Classically, 2,1-benzisoxazoles (anthranils) are prepared from 2-nitroacylbenzenes by a reductive heterocyclization reaction with Sn or SnCl2 concentrated HCl. Acid sensitive functionalities are expected to be incompatible with these conditions; milder approaches to the synthesis of 2,1-benzisoxazoles would be welcomed. We demonstrate that SnCl2 center dot 2H(2)O in a 1:1 mixture of EtOAc/MeOH is capable of mediating the tandem reduction-heterocyclization of a variety of 2-nitroacylbenzenes to their corresponding 2,1-benzisoxazoles in good to excellent yields under essentially neutral conditions. Importantly, several commonly used acid-labile protecting groups, including Boc carbamate, tert-butyl ether, and tert-butyl ester, proved orthogonal to these reaction conditions. (C) 2012 Elsevier Ltd. All rights reserved.