Pyr-Ala-OEt | 172540-00-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 芘
• 英文名称: Pyr-Ala-OEt
• 英文别名: N-(1-pyrenesulfonyl)-L-alanine ethyl ester；ethyl (2S)-2-(pyren-1-ylsulfonylamino)propanoate
• CAS: 172540-00-0
• 化学式: C₂₁H₁₉NO₄S
• 分子量: 381.452
• InChiKey: XELXFUCQWREWPZ-ZDUSSCGKSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.7
• 重原子数：
  27
• 可旋转键数：
  6
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.19
• 拓扑面积：
  80.8
• 氢给体数：
  1
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  Pyr-Ala-OEt 在 sodium hydroxide 、 硝酸 、 乙酸酐 作用下， 以 乙醇 为溶剂， 反应 5.0h， 生成 N-<1-(8-nitropyrenesulfonyl)>-L-alanine
  参考文献：
  名称：

  Long-Lived Charge-Separated Species Observed on Flash Photolysis of Peptide Conjugates. Interplay of Local and Radical Ion Pair Triplet States¹

  摘要：

  Peptides composed of alanine (Ala) and tryptophan (Trp), modified with the (nitro)pyrenesulfonyl chromophore (Pyr and NPyr) at the N-terminus have been examined by nanosecond laser flash photolysis. A common phototransient for Pyr-AlaOEt and Pyr-Ala-TrpOEt was observed that exhibited broad absorption at 410-550 nm and decay time constants in the range, tau(1/2) = 20-40 mu s. This species was assigned to the triplet excited state that is local to the pyrene chromophore ((3)Pyr). For the conjugates having a stronger electron acceptor group at the N-terminus, NPyr-Ala-TrpOEt and NPyr-Ala-Ala-TrpOEt, the local triplet was replaced with a phototransient whose principal feature is a sharp band at 440 nm (assigned to the NPyr(-.) radical anion). The radical ion transients for the NPyr peptide derivatives were assigned to intermediates that result from the intramolecular electron transfer quenching of NP excited species by pendant groups (i.e., the indole ring of tryptophan). The lifetimes observed for the radical ion transients associated with the NPyr series were relatively long (extending to ca. 400 ns) and depended in an interesting way on the structure of the peptide linkage. A mechanism of electron transfer in the singlet manifold and recombination yielding a local Pyr triplet state is important for the Pyr series.

  DOI：

  10.1021/jo981241g
• 作为产物：
  描述：

  1-芘磺酰氯 、 L-丙氨酸乙酯盐酸盐 在 三乙胺 作用下， 以 四氢呋喃 为溶剂， 反应 5.0h， 以62%的产率得到Pyr-Ala-OEt
  参考文献：
  名称：

  Long-Lived Charge-Separated Species Observed on Flash Photolysis of Peptide Conjugates. Interplay of Local and Radical Ion Pair Triplet States¹

  摘要：

  Peptides composed of alanine (Ala) and tryptophan (Trp), modified with the (nitro)pyrenesulfonyl chromophore (Pyr and NPyr) at the N-terminus have been examined by nanosecond laser flash photolysis. A common phototransient for Pyr-AlaOEt and Pyr-Ala-TrpOEt was observed that exhibited broad absorption at 410-550 nm and decay time constants in the range, tau(1/2) = 20-40 mu s. This species was assigned to the triplet excited state that is local to the pyrene chromophore ((3)Pyr). For the conjugates having a stronger electron acceptor group at the N-terminus, NPyr-Ala-TrpOEt and NPyr-Ala-Ala-TrpOEt, the local triplet was replaced with a phototransient whose principal feature is a sharp band at 440 nm (assigned to the NPyr(-.) radical anion). The radical ion transients for the NPyr peptide derivatives were assigned to intermediates that result from the intramolecular electron transfer quenching of NP excited species by pendant groups (i.e., the indole ring of tryptophan). The lifetimes observed for the radical ion transients associated with the NPyr series were relatively long (extending to ca. 400 ns) and depended in an interesting way on the structure of the peptide linkage. A mechanism of electron transfer in the singlet manifold and recombination yielding a local Pyr triplet state is important for the Pyr series.

  DOI：

  10.1021/jo981241g

文献信息

• Long-Lived Charge-Separated Species Observed on Flash Photolysis of Peptide Conjugates. Interplay of Local and Radical Ion Pair Triplet States¹
  作者：Guilford Jones、Lily N. Lu

  DOI：10.1021/jo981241g

  日期：1998.11.1

  Peptides composed of alanine (Ala) and tryptophan (Trp), modified with the (nitro)pyrenesulfonyl chromophore (Pyr and NPyr) at the N-terminus have been examined by nanosecond laser flash photolysis. A common phototransient for Pyr-AlaOEt and Pyr-Ala-TrpOEt was observed that exhibited broad absorption at 410-550 nm and decay time constants in the range, tau(1/2) = 20-40 mu s. This species was assigned to the triplet excited state that is local to the pyrene chromophore ((3)Pyr). For the conjugates having a stronger electron acceptor group at the N-terminus, NPyr-Ala-TrpOEt and NPyr-Ala-Ala-TrpOEt, the local triplet was replaced with a phototransient whose principal feature is a sharp band at 440 nm (assigned to the NPyr(-.) radical anion). The radical ion transients for the NPyr peptide derivatives were assigned to intermediates that result from the intramolecular electron transfer quenching of NP excited species by pendant groups (i.e., the indole ring of tryptophan). The lifetimes observed for the radical ion transients associated with the NPyr series were relatively long (extending to ca. 400 ns) and depended in an interesting way on the structure of the peptide linkage. A mechanism of electron transfer in the singlet manifold and recombination yielding a local Pyr triplet state is important for the Pyr series.