N-[(芴甲氧羰基]-S-9H-呫吨-9-基-L-半胱氨酸 | 186829-25-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并吡喃
• 中文名称: N-[(芴甲氧羰基]-S-9H-呫吨-9-基-L-半胱氨酸
• 中文别名: N-[(芴甲氧羰基]-S-9H-吨-9-基-L-半胱氨酸；FMOC-S-XAN-L-半胱氨酸
• 英文名称: N^α-(9-fluorenylmethyloxycarbonyl)-S-(9H-xanthen-9-yl)cysteine
• 英文别名: Fmoc-S-xanthyl-L-cysteine；(2R)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-(9H-xanthen-9-ylsulfanyl)propanoic acid
• CAS: 186829-25-4
• 化学式: C₃₁H₂₅NO₅S
• 分子量: 523.609
• InChiKey: XTSQGWFHHHZCOH-SANMLTNESA-N

物化性质

• 沸点：
  743.3±60.0 °C(Predicted)
• 密度：
  1.41±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  6.1
• 重原子数：
  38
• 可旋转键数：
  8
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.16
• 拓扑面积：
  110
• 氢给体数：
  2
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  五氟苯酚 、 N-[(芴甲氧羰基]-S-9H-呫吨-9-基-L-半胱氨酸 在 N,N'-二环己基碳二亚胺 作用下， 以 二氯甲烷 为溶剂， 以94%的产率得到
  参考文献：
  名称：

  逐步固相肽合成过程中半胱氨酸消旋作用的发生和最小化（1）（，）（2）。

  摘要：

  与肽合成领域的常规智慧相反，N，S保护的半胱氨酸衍生物可以通过广泛使用的试剂和逐步掺入的方案进行大量消旋。已根据偶联条件和β-硫醇保护基（即S-乙酰氨基甲基（Acm），S-三苯甲基（三苯甲基或Trt），S-2,4,6-三甲氧基苄基）进行了系统研究。 （Tmob）和S-9H-黄嘌呤9-基（Xan），利用方便且定量的模型系统测定，包括从H-Gly HPLC分离H-Gly-L-Cys-Phe-NH（2） -D-Cys-Phe-NH（2）。例如，由，盐和铵盐，例如六氟磷酸（苯并三唑基氧基）三（二甲氨基）phosph（BOP）介导的偶联的标准方案，N-[（（1H-苯并三唑-1-基）（二甲基氨基）亚甲基] -N-甲基甲基六氟磷酸铵N-氧化物（HBTU），N-[[（（二甲基氨基）-1H-1,2,3-三唑[4,5] -b]吡啶基-1-基]亚甲基] -N-甲基甲基六氟磷酸铵N-氧化物（HATU）和（7-氮杂

  DOI：

  10.1021/jo9622744
• 作为产物：
  描述：

  FMOC-胱氨酸 在 三氟乙酸 、 锌 作用下， 以 甲醇 、 二氯甲烷 、 三氟乙酸 为溶剂， 反应 1.0h， 生成 N-[(芴甲氧羰基]-S-9H-呫吨-9-基-L-半胱氨酸
  参考文献：
  名称：

  Novel S-Xanthenyl Protecting Groups for Cysteine and Their Applications for the N^α-9-Fluorenylmethyloxycarbonyl (Fmoc) Strategy of Peptide Synthesis^1-3

  摘要：

  The 9H-xanthen-9-yl (Xan) and 2-methoxy-9H-xanthen-9-yl (2-Moxan) groups can be introduced onto sulfhydryl functions by S-alkylation reactions involving the corresponding xanthydrols, plus trifluoroacetic acid (TFA) as catalyst. Conversely, these groups are removed rapidly by acid in the presence of appropriate silane or thiol scavengers. The 3-methoxy-9H-xanthen-9-yl (3-Moxan) derivative was also studied, but abandoned for several reasons including challenging synthesis, excessive lability to acid, and insufficient stability in the presence of base. The N-alpha-9-fluorenyl-methyloxycarbonyl (Fmoc), S-Xan or 2-Moxan-protected cysteine derivatives were prepared and applied to the solid-phase syntheses of several model peptides. Selective removal of S-Xan and S-2-Moxan groups, while retaining tris(alkoxybenzyl)amide (PAL) anchoring, is best accomplished with TFA-CH2Cl2-Et3SiH (1:98.5:0.5), 25 degrees C, 2 h. Alternatively, oxidative deprotection of S-Xan or S-2-Moxan with iodine (10-20 equiv) or thallium(III) tris(trifluoroacetate) [Tl(tfa)(3)] (1-3 equiv) to provide disulfides can be carried out on peptide substrates both in solution and while polymer-bound. Compared to established chemistries with the acid-labile and oxidizable S-triphenylmethyl (Trt) group, S-Xan and S-2-Moxan gave equal or superior results in terms of peptide purities (including no detectable tryptophan alkylation) and overall yields.

  DOI：

  10.1021/jo961882g

文献信息

• Occurrence and Minimization of Cysteine Racemization during Stepwise Solid-Phase Peptide Synthesis¹^,²
  作者：Yongxin Han、Fernando Albericio、George Barany

  DOI：10.1021/jo9622744

  日期：1997.6.1

  suitable additives such as 1-hydroxybenzotriazole (HOBt) or 7-aza-1-hydroxybenzotriazole (HOAt) plus a tertiary amine base such as N,N-diisopropylethylamine (DIEA) or N-methylmorpholine (NMM). Under such conditions, the levels of racemization in the model peptide, expressed as the ratio of D:L peptide formed, were in the entirely unacceptable range of 5-33%. However, these levels were in general reduced

  与肽合成领域的常规智慧相反，N，S保护的半胱氨酸衍生物可以通过广泛使用的试剂和逐步掺入的方案进行大量消旋。已根据偶联条件和β-硫醇保护基（即S-乙酰氨基甲基（Acm），S-三苯甲基（三苯甲基或Trt），S-2,4,6-三甲氧基苄基）进行了系统研究。 （Tmob）和S-9H-黄嘌呤9-基（Xan），利用方便且定量的模型系统测定，包括从H-Gly HPLC分离H-Gly-L-Cys-Phe-NH（2） -D-Cys-Phe-NH（2）。例如，由，盐和铵盐，例如六氟磷酸（苯并三唑基氧基）三（二甲氨基）phosph（BOP）介导的偶联的标准方案，N-[（（1H-苯并三唑-1-基）（二甲基氨基）亚甲基] -N-甲基甲基六氟磷酸铵N-氧化物（HBTU），N-[[（（二甲基氨基）-1H-1,2,3-三唑[4,5] -b]吡啶基-1-基]亚甲基] -N-甲基甲基六氟磷酸铵N-氧化物（HATU）和（7-氮杂
• Novel <i>S</i>-Xanthenyl Protecting Groups for Cysteine and Their Applications for the <i>N</i>^α-9-Fluorenylmethyloxycarbonyl (Fmoc) Strategy of Peptide Synthesis^1-3
  作者：Yongxin Han、George Barany

  DOI：10.1021/jo961882g

  日期：1997.6.13

  The 9H-xanthen-9-yl (Xan) and 2-methoxy-9H-xanthen-9-yl (2-Moxan) groups can be introduced onto sulfhydryl functions by S-alkylation reactions involving the corresponding xanthydrols, plus trifluoroacetic acid (TFA) as catalyst. Conversely, these groups are removed rapidly by acid in the presence of appropriate silane or thiol scavengers. The 3-methoxy-9H-xanthen-9-yl (3-Moxan) derivative was also studied, but abandoned for several reasons including challenging synthesis, excessive lability to acid, and insufficient stability in the presence of base. The N-alpha-9-fluorenyl-methyloxycarbonyl (Fmoc), S-Xan or 2-Moxan-protected cysteine derivatives were prepared and applied to the solid-phase syntheses of several model peptides. Selective removal of S-Xan and S-2-Moxan groups, while retaining tris(alkoxybenzyl)amide (PAL) anchoring, is best accomplished with TFA-CH2Cl2-Et3SiH (1:98.5:0.5), 25 degrees C, 2 h. Alternatively, oxidative deprotection of S-Xan or S-2-Moxan with iodine (10-20 equiv) or thallium(III) tris(trifluoroacetate) [Tl(tfa)(3)] (1-3 equiv) to provide disulfides can be carried out on peptide substrates both in solution and while polymer-bound. Compared to established chemistries with the acid-labile and oxidizable S-triphenylmethyl (Trt) group, S-Xan and S-2-Moxan gave equal or superior results in terms of peptide purities (including no detectable tryptophan alkylation) and overall yields.