(4-nitrophenyl)methyl 2-hydroxy-2-[(3S,4R)-2-oxo-4-pent-3-ynyl-3-[(2-phenoxyacetyl)amino]azetidin-1-yl]acetate | 200420-85-5

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 内酰胺类
• 英文名称: (4-nitrophenyl)methyl 2-hydroxy-2-[(3S,4R)-2-oxo-4-pent-3-ynyl-3-[(2-phenoxyacetyl)amino]azetidin-1-yl]acetate
• CAS: 200420-85-5
• 化学式: C₂₅H₂₅N₃O₈
• 分子量: 495.489
• InChiKey: CNMVTWSMFDJPGK-ZZNRJTPNSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.3
• 重原子数：
  36
• 可旋转键数：
  11
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.32
• 拓扑面积：
  151
• 氢给体数：
  2
• 氢受体数：
  8

反应信息

• 作为反应物：
  描述：

  (4-nitrophenyl)methyl 2-hydroxy-2-[(3S,4R)-2-oxo-4-pent-3-ynyl-3-[(2-phenoxyacetyl)amino]azetidin-1-yl]acetate 在 吡啶 、 二甲基硫 、 四氯化锡 、 臭氧 作用下， 以 二氯甲烷 为溶剂， 反应 6.5h， 生成 p-nitrobenzyl 7β-[(phenoxyacetyl)amino]-3-hydroxy-1-carba-1-dethia-3-cephem-4-carboxylate
  参考文献：
  名称：

  Halide-Terminated N-Acyliminium Ion−Alkyne Cyclizations:  A New Construction of Carbacephem Antibiotics

  摘要：

  A series of 4-(3-alkynyl)azetidinones 13 was prepared from 4-(phenylsulfonyl)azetidine-2-one (9) and isopropyl glyoxylate hydrate. The 3-pentynyl (13a) and 4-phenyl-3-butynyl (13b) azetidinone acetates underwent 6-exo cyclization when treated with 3 equiv of SnCl4 at 0 degrees C to provide 3-(1-chloroalkylidene)carbacephems 15a (65%) and 15b (33%) respectively. In contrast, the 5-butynyl (13d) and 4-(trimethylsilyl)-3-butynyl (13c) azetidinone acetates under ent 7-endo cyclization under similar conditions to give 1-azabicyclo[5.2.0]nonenes 14a (11%) and 14b (71%), respectively. Beginning with penicillin degradation product 18, the more elaborate 3-pentynyl azetidinone cyclization substrate 27 was prepared in seven steps. Exposure to 27 to 3 equiv of SnCl4 in CH2Cl2 at 0 degrees C for 6 h, followed by allowing the reaction mixture to warm to rt, provided the desired 3-(1-chloroethylidene)carbacephem 28 in 60% yield and high (>99%) enantiometric purity. Cleavage of the chloroethylidene group of 28 with ozone gave 3-hydroxy carbacephem 29 in 77% yield. Since this intermediate has been converted in three steps to loracarbef (3), a new formal total synthesis of this carbacephem antiboitic was concluded.

  DOI：

  10.1021/jo971433w
• 作为产物：
  描述：

  戊-3-炔基三氟甲磺酸酯 在 盐酸 、 4 A molecular sieve 、 lithium tri-t-butoxyaluminum hydride 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 N,N-二甲基甲酰胺 、 甲苯 为溶剂， 反应 13.25h， 生成 (4-nitrophenyl)methyl 2-hydroxy-2-[(3S,4R)-2-oxo-4-pent-3-ynyl-3-[(2-phenoxyacetyl)amino]azetidin-1-yl]acetate
  参考文献：
  名称：

  Halide-Terminated N-Acyliminium Ion−Alkyne Cyclizations:  A New Construction of Carbacephem Antibiotics

  摘要：

  A series of 4-(3-alkynyl)azetidinones 13 was prepared from 4-(phenylsulfonyl)azetidine-2-one (9) and isopropyl glyoxylate hydrate. The 3-pentynyl (13a) and 4-phenyl-3-butynyl (13b) azetidinone acetates underwent 6-exo cyclization when treated with 3 equiv of SnCl4 at 0 degrees C to provide 3-(1-chloroalkylidene)carbacephems 15a (65%) and 15b (33%) respectively. In contrast, the 5-butynyl (13d) and 4-(trimethylsilyl)-3-butynyl (13c) azetidinone acetates under ent 7-endo cyclization under similar conditions to give 1-azabicyclo[5.2.0]nonenes 14a (11%) and 14b (71%), respectively. Beginning with penicillin degradation product 18, the more elaborate 3-pentynyl azetidinone cyclization substrate 27 was prepared in seven steps. Exposure to 27 to 3 equiv of SnCl4 in CH2Cl2 at 0 degrees C for 6 h, followed by allowing the reaction mixture to warm to rt, provided the desired 3-(1-chloroethylidene)carbacephem 28 in 60% yield and high (>99%) enantiometric purity. Cleavage of the chloroethylidene group of 28 with ozone gave 3-hydroxy carbacephem 29 in 77% yield. Since this intermediate has been converted in three steps to loracarbef (3), a new formal total synthesis of this carbacephem antiboitic was concluded.

  DOI：

  10.1021/jo971433w

文献信息

• Halide-Terminated <i>N</i>-Acyliminium Ion−Alkyne Cyclizations:  A New Construction of Carbacephem Antibiotics
  作者：Eric Metais、Larry E. Overman、Maria Inés Rodriguez、Brian A. Stearns

  DOI：10.1021/jo971433w

  日期：1997.12.1

  A series of 4-(3-alkynyl)azetidinones 13 was prepared from 4-(phenylsulfonyl)azetidine-2-one (9) and isopropyl glyoxylate hydrate. The 3-pentynyl (13a) and 4-phenyl-3-butynyl (13b) azetidinone acetates underwent 6-exo cyclization when treated with 3 equiv of SnCl4 at 0 degrees C to provide 3-(1-chloroalkylidene)carbacephems 15a (65%) and 15b (33%) respectively. In contrast, the 5-butynyl (13d) and 4-(trimethylsilyl)-3-butynyl (13c) azetidinone acetates under ent 7-endo cyclization under similar conditions to give 1-azabicyclo[5.2.0]nonenes 14a (11%) and 14b (71%), respectively. Beginning with penicillin degradation product 18, the more elaborate 3-pentynyl azetidinone cyclization substrate 27 was prepared in seven steps. Exposure to 27 to 3 equiv of SnCl4 in CH2Cl2 at 0 degrees C for 6 h, followed by allowing the reaction mixture to warm to rt, provided the desired 3-(1-chloroethylidene)carbacephem 28 in 60% yield and high (>99%) enantiometric purity. Cleavage of the chloroethylidene group of 28 with ozone gave 3-hydroxy carbacephem 29 in 77% yield. Since this intermediate has been converted in three steps to loracarbef (3), a new formal total synthesis of this carbacephem antiboitic was concluded.