tert-butyl (7S)-(2Z)-6-aza-7-benzyl-8-hydroxy-6-(p-toluenesulfonyl)oct-2-enoate | 903516-54-1

• 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 (7S)-(2Z)-6-aza-7-benzyl-8-hydroxy-6-(p-toluenesulfonyl)oct-2-enoate
• CAS: 903516-54-1
• 化学式: C₂₅H₃₃NO₅S
• 分子量: 459.607
• InChiKey: RHPABHWNUPJCTR-DTDSUUGDSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.88
• 重原子数：
  32.0
• 可旋转键数：
  10.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  83.91
• 氢给体数：
  1.0
• 氢受体数：
  5.0

反应信息

• 作为反应物：
  描述：

  tert-butyl (7S)-(2Z)-6-aza-7-benzyl-8-hydroxy-6-(p-toluenesulfonyl)oct-2-enoate 在 三乙胺 、 lithium bromide 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 49.0h， 生成 tert-butyl (2E,7S)-6-aza-7-benzyl-8-bromo-6-(p-toluenesulfonyl)oct-2-enoate
  参考文献：
  名称：

  Synthesis of 2,4-Disubstituted Piperidines via Radical Cyclization:  Unexpected Enhancement in Diastereoselectivity with Tris(trimethylsilyl)silane

  摘要：

  [GRAPHICS]A novel approach to 2,4-disubstituted piperidines is reported, involving the radical cyclization of 7-substituted-6-aza-8-bromooct-2-enoates. Cyclization with tributyltin hydride affords the trans piperidines with trans/cis diastereomeric ratios ranging typically from 3:1 to 6:1. Cyclization with tris( trimethylsilyl)silane affords the same products with diastereomeric ratios of up to 99: 1 in certain cases. The enhancement in diastereoselectivity results from the selective rearrangement of the minor stereoisomer through a cascade process involving radical cyclization to the piperidine radical, 1,5-radical translocation, and attack of the translocated radical onto the sulfonamide with extrusion of SO2 in a Smiles-type rearrangement. Slower trapping of the piperidine radical by tris(trimethylsilyl) silane compared to tributyltin hydride accounts for the occurrence of the rearrangement cascade in the former case.

  DOI：

  10.1021/jo060495w
• 作为产物：
  描述：

  (5S)-4-aza-5-benzyl-1-hydroxy-7-oxa-4-(p-toluenesulfonyl)cycloheptane 、 bis(2,2,2-trifluoroethyl) tert-butoxycarbonylmethylphosphonate 在 18-冠醚-6 、 双(三甲基硅烷基)氨基钾 作用下， 以 四氢呋喃 、 甲苯 为溶剂， 反应 73.0h， 生成 tert-butyl (7S)-(2Z)-6-aza-7-benzyl-8-hydroxy-6-(p-toluenesulfonyl)oct-2-enoate 、 tert-butyl (2E,7S)-6-aza-7-benzyl-8-hydroxy-6-(p-toluenesulfonyl)oct-2-enoate
  参考文献：
  名称：

  Synthesis of 2,4-Disubstituted Piperidines via Radical Cyclization:  Unexpected Enhancement in Diastereoselectivity with Tris(trimethylsilyl)silane

  摘要：

  [GRAPHICS]A novel approach to 2,4-disubstituted piperidines is reported, involving the radical cyclization of 7-substituted-6-aza-8-bromooct-2-enoates. Cyclization with tributyltin hydride affords the trans piperidines with trans/cis diastereomeric ratios ranging typically from 3:1 to 6:1. Cyclization with tris( trimethylsilyl)silane affords the same products with diastereomeric ratios of up to 99: 1 in certain cases. The enhancement in diastereoselectivity results from the selective rearrangement of the minor stereoisomer through a cascade process involving radical cyclization to the piperidine radical, 1,5-radical translocation, and attack of the translocated radical onto the sulfonamide with extrusion of SO2 in a Smiles-type rearrangement. Slower trapping of the piperidine radical by tris(trimethylsilyl) silane compared to tributyltin hydride accounts for the occurrence of the rearrangement cascade in the former case.

  DOI：

  10.1021/jo060495w