(2R,3R,6R,7R)-3-tert-butyldimethylsilyloxy-2-(p-nitrobenzyloxycarbonyl)-7-ethyl-8-oxo-1-azabicyclo[4.2.0]octane | 216860-98-9

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: (2R,3R,6R,7R)-3-tert-butyldimethylsilyloxy-2-(p-nitrobenzyloxycarbonyl)-7-ethyl-8-oxo-1-azabicyclo[4.2.0]octane
• 英文别名: (4-nitrophenyl)methyl (2S,3R,6R,7R)-3-[tert-butyl(dimethyl)silyl]oxy-7-ethyl-8-oxo-1-azabicyclo[4.2.0]octane-2-carboxylate
• CAS: 216860-98-9
• 化学式: C₂₃H₃₄N₂O₆Si
• 分子量: 462.618
• InChiKey: MNMUQOSHQRCSPX-WTGUMLROSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.43
• 重原子数：
  32
• 可旋转键数：
  8
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.65
• 拓扑面积：
  102
• 氢给体数：
  0
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  (2R,3R,6R,7R)-3-tert-butyldimethylsilyloxy-2-(p-nitrobenzyloxycarbonyl)-7-ethyl-8-oxo-1-azabicyclo[4.2.0]octane 在 四丁基氟化铵 作用下， 以 四氢呋喃 为溶剂， 反应 1.0h， 以89%的产率得到(6R,7R)-2-(p-nitrobenzyloxycarbonyl)-7-ethyl-8-oxo-1-azabicyclo[4.2.0]-2-octene
  参考文献：
  名称：

  Synthesis of Carbacephems from Serine

  摘要：

  Carbacephems have been synthesized from D-serine by two routes involving construction first of the six-membered ring followed by cyclization to give the bicyclic beta-lactam. In one route, alkylation of a lactim ether was accomplished with Ni(Acac)(2) as a catalyst. The desired R stereochemistry at the carbon corresponding to C-6 of the cephem was obtained by stereospecific hydrogenation of a vinylogous carbamate. The second route involved a stereospecific Michael cyclization to give the same C-6 stereochemistry. Closure of a piperidyl beta-amino acid intermediate common to both routes was accomplished using a modified Mukaiyama reagent found to be superior in our system to the traditional reagent. The resulting carbacephem core was stereospecifically substituted at C-7 with an ethyl or amino functionality. The ethylated intermediate was transformed into a stable enol triflate useful for the further elaboration of biologically important carbacephems.

  DOI：

  10.1021/jo980592s
• 作为产物：
  描述：

  (2R,3R)-6-oxo-3-tert-butyldimethylsilyloxy-2-(tert-butyldimethylsilyloxymethyl)piperidine 在 ruthenium trichloride 、 bis(acetylacetonate)nickel(II) 、 platinum on activated charcoal lithium hydroxide 、 sodium periodate 、 正丁基锂 、 氢气 、 对甲苯磺酸 、 二异丙胺 、 N,N-二异丙基乙胺 、 2-氯-1-甲基吡啶鎓三氟甲烷磺酸盐 作用下， 以 四氢呋喃 、 甲醇 、 四氯化碳 、 乙醇 、 正己烷 、 二氯甲烷 、 氯仿 、 水 、 乙酸乙酯 、 N,N-二甲基甲酰胺 、 乙腈 为溶剂， -78.0~70.0 ℃ 、344.74 kPa 条件下， 反应 200.25h， 生成 (2R,3R,6R,7R)-3-tert-butyldimethylsilyloxy-2-(p-nitrobenzyloxycarbonyl)-7-ethyl-8-oxo-1-azabicyclo[4.2.0]octane
  参考文献：
  名称：

  Synthesis of Carbacephems from Serine

  摘要：

  Carbacephems have been synthesized from D-serine by two routes involving construction first of the six-membered ring followed by cyclization to give the bicyclic beta-lactam. In one route, alkylation of a lactim ether was accomplished with Ni(Acac)(2) as a catalyst. The desired R stereochemistry at the carbon corresponding to C-6 of the cephem was obtained by stereospecific hydrogenation of a vinylogous carbamate. The second route involved a stereospecific Michael cyclization to give the same C-6 stereochemistry. Closure of a piperidyl beta-amino acid intermediate common to both routes was accomplished using a modified Mukaiyama reagent found to be superior in our system to the traditional reagent. The resulting carbacephem core was stereospecifically substituted at C-7 with an ethyl or amino functionality. The ethylated intermediate was transformed into a stable enol triflate useful for the further elaboration of biologically important carbacephems.

  DOI：

  10.1021/jo980592s

文献信息

• Synthesis of Carbacephems from Serine
  作者：James J. Folmer、Carles Acero、Dung L. Thai、Henry Rapoport

  DOI：10.1021/jo980592s

  日期：1998.11.1

  Carbacephems have been synthesized from D-serine by two routes involving construction first of the six-membered ring followed by cyclization to give the bicyclic beta-lactam. In one route, alkylation of a lactim ether was accomplished with Ni(Acac)(2) as a catalyst. The desired R stereochemistry at the carbon corresponding to C-6 of the cephem was obtained by stereospecific hydrogenation of a vinylogous carbamate. The second route involved a stereospecific Michael cyclization to give the same C-6 stereochemistry. Closure of a piperidyl beta-amino acid intermediate common to both routes was accomplished using a modified Mukaiyama reagent found to be superior in our system to the traditional reagent. The resulting carbacephem core was stereospecifically substituted at C-7 with an ethyl or amino functionality. The ethylated intermediate was transformed into a stable enol triflate useful for the further elaboration of biologically important carbacephems.