(2S,4S)-4-Amino-1-<(tert-butoxycarbonyl)methyl>proline tert-butyl ester | 159487-55-5

• 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: (2S,4S)-4-Amino-1-<(tert-butoxycarbonyl)methyl>proline tert-butyl ester
• 英文别名: tert-butyl (2S,4S)-4-amino-1-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]pyrrolidine-2-carboxylate
• CAS: 159487-55-5
• 化学式: C₁₅H₂₈N₂O₄
• 分子量: 300.398
• InChiKey: JWZJIBIZCMBBKD-QWRGUYRKSA-N

物化性质

• 沸点：
  364.7±42.0 °C(predicted)
• 密度：
  1.066±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.4
• 重原子数：
  21
• 可旋转键数：
  7
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.87
• 拓扑面积：
  81.9
• 氢给体数：
  1
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  (2S,4S)-4-Amino-1-<(tert-butoxycarbonyl)methyl>proline tert-butyl ester 在 palladium on activated charcoal 盐酸 、 氢气 、 N,N-二异丙基乙胺 作用下， 以 1,4-二氧六环 、 甲醇 、 二氯甲烷 、 乙腈 为溶剂， 反应 54.0h， 生成 N,N-Bis<(2S,4S)-4-<2-carboxy-1-(carboxymethyl)pyrrolidinyl>>glycine trihydrochloride
  参考文献：
  名称：

  Synthesis of Conformationally Constrained DTPA Analogs. Incorporation of the Ethylenediamine Units as Aminopyrrolidines

  摘要：

  The synthesis of conformationally constrained diethylenetriaminepentaacetic acid (DTPA) analogues is an effort to probe the relationship between ligand structure and metal complex stability. In the pursuit of this objective, diastereomerically and enantiomerically pure mono- and bis-pyrrolidine analogues of DTPA have been prepared from trans-4-hydroxy-L-proline. The mono-pyrrolidine chelator 1 was constructed from a single hydroxyproline unit and an ethylenediamine moiety while two hydroxyproline-derived fragments 4e or 14b and 9b were coupled by N-alkylation of a triflate to afford the core bis-pyrrolidine structures: optically active 10 and meso-15. Deprotection of the triamine pentaesters 12 and 17 afforded the triamine pentaacetic acids 2 and 3 as their hydrochloride salts. The stereochemical homogeneity of precursor esters 12 and 17 was determined by HPLC using authentic epimeric standards to establish that essentially no racemization of the original amino acid a-center had occurred. Some loss of stereochemical homogeniety was encountered in the synthesis of 10 and 15 by N-alkylation of aminoproline 9b with a hydroxyproline-derived triflate, which had proceeded with some retention of configuration. The diastereomeric impurities were removed by crystallization of the respective benzyl carbamates. Bis-pyrrolidine pentaacids 2 and 3 formed isolable chelates with gadolinium and lutetium. A comparision of the lutetium chelates of 2 and 3 by NMR revealed significant differences which were reflective of a rigid structure with 2, while metal complexation with 3 was structurally less defined.

  DOI：

  10.1021/jo00092a022
• 作为产物：
  描述：

  L-羟基脯氨酸 在 palladium on activated charcoal sodium azide 、 氢气 、 碳酸氢钠 、 N,N-二异丙基乙胺 作用下， 以 四氢呋喃 、 甲醇 、 二氯甲烷 、 水 、 N,N-二甲基甲酰胺 、 乙腈 为溶剂， 55.0 ℃ 、344.73 kPa 条件下， 反应 45.5h， 生成 (2S,4S)-4-Amino-1-<(tert-butoxycarbonyl)methyl>proline tert-butyl ester
  参考文献：
  名称：

  Synthesis of Conformationally Constrained DTPA Analogs. Incorporation of the Ethylenediamine Units as Aminopyrrolidines

  摘要：

  The synthesis of conformationally constrained diethylenetriaminepentaacetic acid (DTPA) analogues is an effort to probe the relationship between ligand structure and metal complex stability. In the pursuit of this objective, diastereomerically and enantiomerically pure mono- and bis-pyrrolidine analogues of DTPA have been prepared from trans-4-hydroxy-L-proline. The mono-pyrrolidine chelator 1 was constructed from a single hydroxyproline unit and an ethylenediamine moiety while two hydroxyproline-derived fragments 4e or 14b and 9b were coupled by N-alkylation of a triflate to afford the core bis-pyrrolidine structures: optically active 10 and meso-15. Deprotection of the triamine pentaesters 12 and 17 afforded the triamine pentaacetic acids 2 and 3 as their hydrochloride salts. The stereochemical homogeneity of precursor esters 12 and 17 was determined by HPLC using authentic epimeric standards to establish that essentially no racemization of the original amino acid a-center had occurred. Some loss of stereochemical homogeniety was encountered in the synthesis of 10 and 15 by N-alkylation of aminoproline 9b with a hydroxyproline-derived triflate, which had proceeded with some retention of configuration. The diastereomeric impurities were removed by crystallization of the respective benzyl carbamates. Bis-pyrrolidine pentaacids 2 and 3 formed isolable chelates with gadolinium and lutetium. A comparision of the lutetium chelates of 2 and 3 by NMR revealed significant differences which were reflective of a rigid structure with 2, while metal complexation with 3 was structurally less defined.

  DOI：

  10.1021/jo00092a022

文献信息

• Synthesis of Conformationally Constrained DTPA Analogs. Incorporation of the Ethylenediamine Units as Aminopyrrolidines
  作者：Matthew A. Williams、Henry Rapoport

  DOI：10.1021/jo00092a022

  日期：1994.7

  The synthesis of conformationally constrained diethylenetriaminepentaacetic acid (DTPA) analogues is an effort to probe the relationship between ligand structure and metal complex stability. In the pursuit of this objective, diastereomerically and enantiomerically pure mono- and bis-pyrrolidine analogues of DTPA have been prepared from trans-4-hydroxy-L-proline. The mono-pyrrolidine chelator 1 was constructed from a single hydroxyproline unit and an ethylenediamine moiety while two hydroxyproline-derived fragments 4e or 14b and 9b were coupled by N-alkylation of a triflate to afford the core bis-pyrrolidine structures: optically active 10 and meso-15. Deprotection of the triamine pentaesters 12 and 17 afforded the triamine pentaacetic acids 2 and 3 as their hydrochloride salts. The stereochemical homogeneity of precursor esters 12 and 17 was determined by HPLC using authentic epimeric standards to establish that essentially no racemization of the original amino acid a-center had occurred. Some loss of stereochemical homogeniety was encountered in the synthesis of 10 and 15 by N-alkylation of aminoproline 9b with a hydroxyproline-derived triflate, which had proceeded with some retention of configuration. The diastereomeric impurities were removed by crystallization of the respective benzyl carbamates. Bis-pyrrolidine pentaacids 2 and 3 formed isolable chelates with gadolinium and lutetium. A comparision of the lutetium chelates of 2 and 3 by NMR revealed significant differences which were reflective of a rigid structure with 2, while metal complexation with 3 was structurally less defined.