tert-butyl-2-(2-bromo-5-methoxybenzyl) acetoacetate | 371114-85-1

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯酚醚
• 英文名称: tert-butyl-2-(2-bromo-5-methoxybenzyl) acetoacetate
• 英文别名: Tert-butyl 2-[(2-bromo-5-methoxyphenyl)methyl]-3-oxobutanoate
• CAS: 371114-85-1
• 化学式: C₁₆H₂₁BrO₄
• 分子量: 357.244
• InChiKey: IWKYYQCIJJMSLH-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.6
• 重原子数：
  21
• 可旋转键数：
  7
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.5
• 拓扑面积：
  52.6
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  tert-butyl-2-(2-bromo-5-methoxybenzyl) acetoacetate 在 盐酸 作用下， 反应 51.0h， 以100%的产率得到4-(2-bromo-5-methoxyphenyl)-2-butanone
  参考文献：
  名称：

  Intramolecular Homolytic Substitution at Selenium:  Synthesis of Novel Selenium-Containing Vitamin E Analogues

  摘要：

  Treatment of 1-(benzylselenenyl)-5-butyl-5-nonanoI (10) with oxalyl chloride followed by the sodium salt of N-hydroxypyridine-2-thione afforded the corresponding pyridine-2-thione-N-oxycarbonyI (PTOC) oxalate ester which was not isolated but immediately heated to provide 2,2-dibutylselenane (7). This transformation presumably involves a tertiary alkyl radical that undergoes intramolecular homolytic substitution at selenium with loss of the benzyl radical to provide the selenium-containing ring system (7). A similar protocol, when applied to 1-(2-benzylselenenyl-5-methoxyphenyl)-3-methyl3-heptanol (18) and 1-(2-benzylselenenyl-5-methoxyphenyl)-3,7,11,15-tetramethyl-3-hexadecanoI (19), followed by deprotection, afforded the selenium-containing alpha -tocopherol analogues 4 and 1f, respectively, in moderate yields. To the best of our knowledge, these transformations represent the first examples of tertiary radicals involved in homolytic substitution chemistry at selenium.td2

  DOI：

  10.1021/jo010274k
• 作为产物：
  描述：

  methyl 2,3,4,6-tetra-O-benzyl α-D-glucopyranoside 、 乙酰乙酸叔丁酯 在 sodium hydride 作用下， 以71%的产率得到tert-butyl-2-(2-bromo-5-methoxybenzyl) acetoacetate
  参考文献：
  名称：

  Intramolecular Homolytic Substitution at Selenium:  Synthesis of Novel Selenium-Containing Vitamin E Analogues

  摘要：

  Treatment of 1-(benzylselenenyl)-5-butyl-5-nonanoI (10) with oxalyl chloride followed by the sodium salt of N-hydroxypyridine-2-thione afforded the corresponding pyridine-2-thione-N-oxycarbonyI (PTOC) oxalate ester which was not isolated but immediately heated to provide 2,2-dibutylselenane (7). This transformation presumably involves a tertiary alkyl radical that undergoes intramolecular homolytic substitution at selenium with loss of the benzyl radical to provide the selenium-containing ring system (7). A similar protocol, when applied to 1-(2-benzylselenenyl-5-methoxyphenyl)-3-methyl3-heptanol (18) and 1-(2-benzylselenenyl-5-methoxyphenyl)-3,7,11,15-tetramethyl-3-hexadecanoI (19), followed by deprotection, afforded the selenium-containing alpha -tocopherol analogues 4 and 1f, respectively, in moderate yields. To the best of our knowledge, these transformations represent the first examples of tertiary radicals involved in homolytic substitution chemistry at selenium.td2

  DOI：

  10.1021/jo010274k

文献信息

• Intramolecular Homolytic Substitution at Selenium:  Synthesis of Novel Selenium-Containing Vitamin E Analogues
  作者：Nawaf Al-Maharik、Lars Engman、Jonas Malmström、Carl H. Schiesser

  DOI：10.1021/jo010274k

  日期：2001.9.1

  Treatment of 1-(benzylselenenyl)-5-butyl-5-nonanoI (10) with oxalyl chloride followed by the sodium salt of N-hydroxypyridine-2-thione afforded the corresponding pyridine-2-thione-N-oxycarbonyI (PTOC) oxalate ester which was not isolated but immediately heated to provide 2,2-dibutylselenane (7). This transformation presumably involves a tertiary alkyl radical that undergoes intramolecular homolytic substitution at selenium with loss of the benzyl radical to provide the selenium-containing ring system (7). A similar protocol, when applied to 1-(2-benzylselenenyl-5-methoxyphenyl)-3-methyl3-heptanol (18) and 1-(2-benzylselenenyl-5-methoxyphenyl)-3,7,11,15-tetramethyl-3-hexadecanoI (19), followed by deprotection, afforded the selenium-containing alpha -tocopherol analogues 4 and 1f, respectively, in moderate yields. To the best of our knowledge, these transformations represent the first examples of tertiary radicals involved in homolytic substitution chemistry at selenium.td2