3-(2-Bromo-3-methyl-but-3-enyl)-2,2-dimethyl-7-pentyl-2H-chromen-5-ol | 137091-82-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并吡喃
• 英文名称: 3-(2-Bromo-3-methyl-but-3-enyl)-2,2-dimethyl-7-pentyl-2H-chromen-5-ol
• 英文别名: 3-(2-bromo-3-methylbut-3-enyl)-2,2-dimethyl-7-pentylchromen-5-ol
• CAS: 137091-82-8
• 化学式: C₂₁H₂₉BrO₂
• 分子量: 393.364
• InChiKey: KMVTWMBBUMHNQQ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.8
• 重原子数：
  24
• 可旋转键数：
  7
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.52
• 拓扑面积：
  29.5
• 氢给体数：
  1
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  3-(2-Bromo-3-methyl-but-3-enyl)-2,2-dimethyl-7-pentyl-2H-chromen-5-ol 在 2,6-二叔丁基-4-甲基苯酚 、 1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下， 以 苯 为溶剂， 反应 2.0h， 以81%的产率得到3-(3-methyl-1,3-butadienyl)-2,2-dimethyl-5-hydroxy-7-pentylbenzopyran
  参考文献：
  名称：

  3-Vinylcoumarins and 3-vinylchromenes as dienes. Application to the synthesis of 3,4-fused coumarins and chromenes

  摘要：

  The reaction of alpha-(diethylphosphono)-gamma-butyrolactones 1 with o-hydroxyaryl aldehydes 2 and 7 gave 3-(2-hydroxyethyl)coumarins 3 in excellent yields. Treatment of 3 or 3-(2-hydroxyethyl)-2,2-dimethylchromenes 11 derived from 3 with triphenylphosphine dibromide led to the corresponding 3-(2-bromoethyl)coumarins 8 or 3-(2-bromoethyl)chromenes 12 in good yields. The Diels-Alder reaction of the 3-vinylcoumarins 13 or the 3-vinylchromenes 31, generated in situ from treatment of the bromides 8 or 12 with DBU, with a variety of dienophiles 14-19 and 35 produced regiospecific [2 + 4] cycloadducts, 3,4-fused coumarins 20-28 or 3,4-fused chromenes 32-34 and 36 in good to moderate yields.

  DOI：

  10.1021/jo00027a032
• 作为产物：
  描述：

  1-(5-Methoxymethoxy-2,2-dimethyl-7-pentyl-2H-chromen-3-yl)-3-methyl-but-3-en-2-ol 在 triphenylphosphine dibromide 1:1 addition complex 作用下， 以 乙腈 为溶剂， 以84%的产率得到3-(2-Bromo-3-methyl-but-3-enyl)-2,2-dimethyl-7-pentyl-2H-chromen-5-ol
  参考文献：
  名称：

  3-Vinylcoumarins and 3-vinylchromenes as dienes. Application to the synthesis of 3,4-fused coumarins and chromenes

  摘要：

  The reaction of alpha-(diethylphosphono)-gamma-butyrolactones 1 with o-hydroxyaryl aldehydes 2 and 7 gave 3-(2-hydroxyethyl)coumarins 3 in excellent yields. Treatment of 3 or 3-(2-hydroxyethyl)-2,2-dimethylchromenes 11 derived from 3 with triphenylphosphine dibromide led to the corresponding 3-(2-bromoethyl)coumarins 8 or 3-(2-bromoethyl)chromenes 12 in good yields. The Diels-Alder reaction of the 3-vinylcoumarins 13 or the 3-vinylchromenes 31, generated in situ from treatment of the bromides 8 or 12 with DBU, with a variety of dienophiles 14-19 and 35 produced regiospecific [2 + 4] cycloadducts, 3,4-fused coumarins 20-28 or 3,4-fused chromenes 32-34 and 36 in good to moderate yields.

  DOI：

  10.1021/jo00027a032