(+/-)-tert-butyl 1-(benzyloxy)pent-4-en-2-yloxycarbamate | 1132792-73-4

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: (+/-)-tert-butyl 1-(benzyloxy)pent-4-en-2-yloxycarbamate
• 英文别名: tert-butyl N-(1-phenylmethoxypent-4-en-2-yloxy)carbamate
• CAS: 1132792-73-4
• 化学式: C₁₇H₂₅NO₄
• 分子量: 307.39
• InChiKey: JVXIAHKEFGZUAC-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.5
• 重原子数：
  22
• 可旋转键数：
  10
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.47
• 拓扑面积：
  56.8
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  2-溴-1,3,5-三甲基苯 、 (+/-)-tert-butyl 1-(benzyloxy)pent-4-en-2-yloxycarbamate 在 tris(dibenzylideneacetone)dipalladium (0) 、 sodium t-butanolate 、 tri tert-butylphosphoniumtetrafluoroborate 作用下， 以 甲苯 为溶剂， 反应 9.0h， 以65%的产率得到(+/-)-(3S*,5S*)-tert-butyl 5-(benzyloxymethyl)-3-(2,4,6-trimethylbenzyl)isoxazolidine-2-carboxylate
  参考文献：
  名称：

  Influence of Hydroxylamine Conformation on Stereocontrol in Pd-Catalyzed Isoxazolidine-Forming Reactions

  摘要：

  Palladium-catalyzed carboamination reactions between N-Boc-O-(but-3-enyl)hydroxylamine derivatives and aryl or alkenyl bromides afford cis-3,5- and trans-4,5-disubstituted isoxazolidines in good yield with up to >20:1 dr. The diastercoselectivity observed in the formation of cis-3,5-disubstituted isoxazolidines is superior to selectivities typically obtained in other transformations, such as 1,3-dipolar cycloaddition reactions, that provide these products. In addition, the stereocontrol in the C-N bond-forming Pd-catalyzed carboamination reactions of N-Boc-O-(but-3-enyl)hydroxylamines is significantly higher than that of related C-O bond-forming carboetherification reactions of N-benzyl-N-(but-3-enyl)hydroxylamine derivatives. This is likely due to a stereoelectronic preference for cyclization via transition states in which the Boc group is placed in a perpendicular orientation relative to the plane of the developing ring, which derives from the conformational equilibria of substituted hydroxylamines.

  DOI：

  10.1021/jo8027399
• 作为产物：
  描述：

  二碳酸二叔丁酯 、 以 四氢呋喃 为溶剂， 反应 24.0h， 以0.76 g的产率得到(+/-)-tert-butyl 1-(benzyloxy)pent-4-en-2-yloxycarbamate
  参考文献：
  名称：

  Influence of Hydroxylamine Conformation on Stereocontrol in Pd-Catalyzed Isoxazolidine-Forming Reactions

  摘要：

  Palladium-catalyzed carboamination reactions between N-Boc-O-(but-3-enyl)hydroxylamine derivatives and aryl or alkenyl bromides afford cis-3,5- and trans-4,5-disubstituted isoxazolidines in good yield with up to >20:1 dr. The diastercoselectivity observed in the formation of cis-3,5-disubstituted isoxazolidines is superior to selectivities typically obtained in other transformations, such as 1,3-dipolar cycloaddition reactions, that provide these products. In addition, the stereocontrol in the C-N bond-forming Pd-catalyzed carboamination reactions of N-Boc-O-(but-3-enyl)hydroxylamines is significantly higher than that of related C-O bond-forming carboetherification reactions of N-benzyl-N-(but-3-enyl)hydroxylamine derivatives. This is likely due to a stereoelectronic preference for cyclization via transition states in which the Boc group is placed in a perpendicular orientation relative to the plane of the developing ring, which derives from the conformational equilibria of substituted hydroxylamines.

  DOI：

  10.1021/jo8027399