ethyl 4(S)-<(tert-butyloxycarbonyl)amino>-5-<(4-tert-butyloxy)phenyl>pent-2(E)-enoate | 190203-26-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: ethyl 4(S)-<(tert-butyloxycarbonyl)amino>-5-<(4-tert-butyloxy)phenyl>pent-2(E)-enoate
• 英文别名: (4S,5R,E)-ethyl 4-(tert-butoxycarbonylamino)-5-methylhept-2-enoate
• CAS: 190203-26-0
• 化学式: C₂₂H₃₃NO₅
• 分子量: 391.508
• InChiKey: IZFZZAYMUAGGHZ-GWKQRERASA-N

物化性质

• 熔点：
  62 °C
• 沸点：
  510.0±50.0 °C(predicted)
• 密度：
  1.056±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.42
• 重原子数：
  28.0
• 可旋转键数：
  7.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.55
• 拓扑面积：
  73.86
• 氢给体数：
  1.0
• 氢受体数：
  5.0

反应信息

• 作为反应物：
  描述：

  ethyl 4(S)-<(tert-butyloxycarbonyl)amino>-5-<(4-tert-butyloxy)phenyl>pent-2(E)-enoate 在 吗啉 、 2,6-二甲基吡啶 、 4-二甲氨基吡啶 、 sodium hydroxide 、 四(三苯基膦)钯 、 三氟甲磺酸三甲基硅酯 、 茴香硫醚 、 silica gel 、 1-羟基苯并三唑 、 戴斯-马丁氧化剂 、 O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 、 N,N-二异丙基乙胺 、 三氟乙酸 、 叔丁醇 作用下， 以 1,4-二氧六环 、 二氯甲烷 、 水 、 乙腈 为溶剂， 反应 70.0h， 生成 cyclotheonamide B
  参考文献：
  名称：

  Flexible and Convergent Total Synthesis of Cyclotheonamide B

  摘要：

  A convergent approach using two key intermediates, segment A [a L-proline-L-alpha-hydroxy-beta-homoarginine-D-phenylalanine (Pro-hArg-D-Phe) tripeptide] and segment B [a vinylogous L-tyrosine-L-2,3-diaminopropanoic acid (vTyr-Dpr) dipeptide], was developed for the synthesis of cyclotheonamide B (Scheme 1). The starting compound for the preparation of the hArg moiety 7, the predominant part of segment A, was N-alpha-(benzyloxycarbonyl)-N-omega , N(omega)'bis(tert-butyloxycarbonyl)-l-arginine methyl ester (15, Scheme 2), which was converted into the aldehyde 16 and subsequently homologated using [tris(methylthio)methyl]lithium as a carboxylic acid anion equivalent. Coupling with properly protected Pro and D-Phe derivatives gave smoothly the desired Pro-hArg-D-Phe tripeptide derivative 24. The key feature of segment B, i.e., the L-tyrosine-derived alpha,beta-unsaturated gamma-amino acid 4, was prepared by a Wadsworth-Emmons olefination of the aldehyde 29 (Scheme 3) derived from N-(tert-butyloxycarbonyl), O-tert-butyl-L-tyrosine methyl ester (28). Selective N-(tert-butyloxycarbonyl) removal in the presence of the aryl tert-butyl ether present in the fully protected segment B, i.e., 32, was achieved by treatment with trimethylsilyl triflate/2,6-lutidine to give vTyr-Dpr dipeptide derivative 34 in quantitative yield. Coupling of the key intermediates 24 and 34 using 2-(1H-benzotriazol-l-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (TBTU) afforded the protected linear pentapeptide 35 in high yield (Scheme 4). Treatment of 35 with Pd(PPh3)(4)/morpholine resulted in simultaneous removal of the C-terminal allyl group and the N-terminal allyloxycarbonyl group to yield 36. Ring closure was effected under dilution conditions by treatment with TBTU/1-hydroxybenzotriazole/4-(dimethylamino and gave the protected cyclopentapeptide 37 in 61% yield. Oxidation of the hydroxyl group with Dess-Rlartin periodinane (24 h, 40 degrees C) in the presence of tert-butyl alcohol gave 38, which was then subjected to O,N-deprotection with trifluoroacetic acid/thioanisole. Subsequent HPLC purification afforded cyclotheonamide B in an overall yield of 1.8% in 17 steps.

  DOI：

  10.1021/jo961447m
• 作为产物：
  描述：

  乙酸,(三甲基正膦亚基)-,乙基酯 、 Boc-D-Tyr(tBu)-H 以 四氢呋喃 为溶剂， 以92%的产率得到ethyl 4(S)-<(tert-butyloxycarbonyl)amino>-5-<(4-tert-butyloxy)phenyl>pent-2(E)-enoate
  参考文献：
  名称：

  HBTU介导的1-羟基苯并三唑（HOBt）共轭物的添加：β-苯并三唑N-氧化物取代的γ-氨基酸和杂合肽的合成和立体化学分析†

  摘要：

  HBTU是一种标准偶联剂，通常用于溶液和固相肽合成过程中的游离羧酸活化。1-羟基苯并三唑（HOBt）在减少肽合成过程中的外消旋作用中起着重要作用；因此，它通常用作偶联剂。在这里，我们报道了由HBTU介导的HOBt轻度和容易地共轭添加到E-乙烯基γ-氨基酸。该反应是中等非对映选择性的，并且以中等至良好的产率分离出新的β-苯并三唑N-氧化物（β-BtO）取代的γ-氨基酸。对主要（反）和次要（syn）共轭加成产物的甲酯进行单晶分析可以推断出仅N的形成。-烷基化的苯并三唑N-氧化物，而不是HOBt的O-烷基化。此外，我们展示了β-BtO取代的γ-氨基酸在肽合成中的利用，并研究了它们在单晶中的构象。

  DOI：

  10.1039/c4ob01548g

文献信息

• Total Synthesis of Cyclotheonamide B, a Facile Route towards Analogues
  作者：H Bastiaans

  DOI：10.1016/00404-0399(50)11539-

  日期：1995.8.14

  A flexible, convergent synthesis of Cyclotheonamide B (1b) was developed, starting from the constituent amino acids, using conventional benzyl-, t-butyl- and allyl-based protecting groups. By modification of the key intermediates, this approach allows the preparation of cyclotheonamide analogues.