4-acetoxy-N-acetyl-2,6-dimethyl-L-tyrosine methyl ester | 145235-86-5

• 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: 4-acetoxy-N-acetyl-2,6-dimethyl-L-tyrosine methyl ester
• 英文别名: N-acetyl-4-acetoxy-2,6-dimethylphenylalanine methyl ester；(S)-N,O-diacetyl-2,6-dimethyltyrosine methyl ester；(S)-4-acetoxy-N-acetyl-2,6-dimethylphenylalanine methyl ester；methyl (2S)-2-acetamido-3-(4-acetyloxy-2,6-dimethylphenyl)propanoate
• CAS: 145235-86-5
• 化学式: C₁₆H₂₁NO₅
• 分子量: 307.346
• InChiKey: IUQVQBCPGJMDKT-HNNXBMFYSA-N

物化性质

• 沸点：
  479.5±45.0 °C(Predicted)
• 密度：
  1.145±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.9
• 重原子数：
  22
• 可旋转键数：
  7
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.44
• 拓扑面积：
  81.7
• 氢给体数：
  1
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  4-acetoxy-N-acetyl-2,6-dimethyl-L-tyrosine methyl ester 在 盐酸 、 水 、 sodium hydroxide 作用下， 反应 72.17h， 生成 N-Boc-2,6-二甲基-L-酪氨酸
  参考文献：
  名称：

  Development of an Asymmetric Hydrogenation Route to (S)-N-Boc-2,6-dimethyltyrosine

  摘要：

  An improved, simpler and potentially more economical route to (S)-N-Boc-2,6-dimethyltyrosine 1, based on a previously published route, is presented. Key modifications were to prepare the dehydroaminoacid hydrogenation substrate 6 in a one-pot process directly from serine methyl ester and 4-iodo-3,5-dimethylphenyl acetate 4 and to identify a significantly more active asymmetric hydrogenation catalyst that allowed a 5-fold reduction in catalyst loading.

  DOI：

  10.1021/op200065p
• 作为产物：
  描述：

  O,N-diacetylserine 在 [Rh(1,5-COD)(S,S-Et-FerroTANE)]BF₄ 、 氢气 、 palladium diacetate 、 三乙胺 、 三(邻甲基苯基)磷 作用下， 以 乙酸乙酯 、 乙腈 为溶剂， 60.0~73.0 ℃ 、500.01 kPa 条件下， 反应 29.0h， 生成 4-acetoxy-N-acetyl-2,6-dimethyl-L-tyrosine methyl ester
  参考文献：
  名称：

  Development of an Asymmetric Hydrogenation Route to (S)-N-Boc-2,6-dimethyltyrosine

  摘要：

  An improved, simpler and potentially more economical route to (S)-N-Boc-2,6-dimethyltyrosine 1, based on a previously published route, is presented. Key modifications were to prepare the dehydroaminoacid hydrogenation substrate 6 in a one-pot process directly from serine methyl ester and 4-iodo-3,5-dimethylphenyl acetate 4 and to identify a significantly more active asymmetric hydrogenation catalyst that allowed a 5-fold reduction in catalyst loading.

  DOI：

  10.1021/op200065p

文献信息

• Practical Enantioselective Hydrogenation of α-Aryl- and α-Carboxyamidoethylenes by Rhodium(I)-{1,2-Bis[(<i>o</i>-<i>tert</i>-butoxyphenyl)(phenyl)phosphino]ethane}
  作者：Barbara Mohar、Michel Stephan

  DOI：10.1002/adsc.201200780

  日期：——

  The rhodium(I)-1,2-bis[(o-tert-butoxyphenyl)(phenyl)phosphino]ethane} [Rh(I)-(t-Bu-SMS-Phos)] catalyst system displayed prime efficiency in the hydrogenation of large series of α-amidostyrenes and α-amidoacrylates. Up to >99.9% enantiomeric excesses coupled with very high reaction rates were attained operating routinely under 1–10 bar of hydrogen at 22 °C in methanol. Examples include industrial substrates

  铑（I） - 1,2-二[（ø -叔-butoxyphenyl）（苯基）膦基〕乙烷}的[Rh（I） - （叔卜-SMS-PHOS）]的催化剂体系显示优越的效率大系列α-酰胺基苯乙烯和α-酰胺基丙烯酸酯的氢化。在22°C的甲醇中，在1-10 bar的氢气下，常规操作可获得高达> 99.9％的对映异构体过量以及极高的反应速率。实例包括工业基材。
• A Bulky Three-Hindered Quadrant Bisphosphine Ligand: Synthesis and Application in Rhodium-Catalyzed Asymmetric Hydrogenation of Functionalized Alkenes
  作者：Yuuki Sawatsugawa、Ken Tamura、Natsuhiro Sano、Tsuneo Imamoto

  DOI：10.1021/acs.orglett.9b02702

  日期：2019.11.15

  quadrant bisphosphine ligand, di-1-adamantylphosphino(tert-butylmethylphosphino)methane, named BulkyP*, has been synthesized via a convergent short pathway with chromatography-free procedures. The ligand is a crystalline solid and can be readily handled in air. Its rhodium(I) complex exhibits very high enantioselectivities and catalytic activities in the asymmetric hydrogenation of functionalized alkenes

  庞大的三阻碍象限双膦配体，二-1-金刚烷基膦基（叔丁基甲基膦基）甲烷，称为BulkyP *，是通过收敛的短路径和无色谱方法合成的。配体是结晶固体，可以很容易地在空气中处理。它的铑（I）配合物在官能化烯烃的不对称氢化中表现出很高的对映选择性和催化活性。
• A Convenient Asymmetric Synthesis of the Unnatural Amino Acid 2,6-Dimethyl-L-tyrosine
  作者：John H. Dygos、Edward E. Yonan、Mike G. Scaros、Owen J. Goodmonson、Daniel P. Getman、Roy A. Periana、Gary R. Beck

  DOI：10.1055/s-1992-26212

  日期：——

  The title compound was prepared in high optical purity by a five-step synthesis from 3,5-dimethylphenol on a kilogram scale. The key steps were a modified palladium-catalyzed coupling of an aryl iodide with methyl 2-acetamidoacrylate and hydrogenation of the resulting sterically hindered dehydroamino acid 4 using [Rh(1,5-COD)- (R,R-DIPAMP)]BF4 as catalyst.

  该标题化合物通过五步合成法从3,5-二甲基酚制备而成，光学纯度较高，规模达到公斤级。关键步骤是对芳基碘化物与甲基2-乙酰氨基丙烯酸酯进行改进的钯催化偶联，以及使用[Rh(1,5-COD)-(R,R-DIPAMP)]BF4作为催化剂对生成的立体位阻去氨基酸4进行氢化。
• Rigid P-Chiral Phosphine Ligands with <i>tert</i>-Butylmethylphosphino Groups for Rhodium-Catalyzed Asymmetric Hydrogenation of Functionalized Alkenes
  作者：Tsuneo Imamoto、Ken Tamura、Zhenfeng Zhang、Yumi Horiuchi、Masashi Sugiya、Kazuhiro Yoshida、Akira Yanagisawa、Ilya D. Gridnev

  DOI：10.1021/ja209700j

  日期：2012.1.25

  prepared in short steps from enantiopure (S)- and (R)-tert-butylmethylphosphine-boranes as the key intermediates. All of these ligands were crystalline solids and were not readily oxidized on exposure to air. Their rhodium complexes exhibited excellent enantioselectivities and high catalytic activities in the asymmetric hydrogenation of functionalized alkenes, such as dehydroamino acid derivatives and enamides

  2,3-双(叔丁基甲基膦基)喹喔啉 (QuinoxP*)、1,2-双(叔丁基甲基膦基)苯 (BenzP*) 和 1,2-双(叔丁基甲基膦基)-4,5 的两种对映异构体-(亚甲基二氧基)苯 (DioxyBenzP*) 以对映体纯 (S)- 和 (R)-叔丁基甲基膦硼烷为关键中间体，通过短步骤制备。所有这些配体都是结晶固体并且在暴露于空气时不容易被氧化。它们的铑配合物在功能化烯烃（如脱氢氨基酸衍生物和烯酰胺）的不对称氢化中表现出优异的对映选择性和高催化活性。这些催化剂的实际效用通过几种具有氨基酸或仲胺成分的手性药物成分的有效制备得到证明。结构简单的配体 BenzP* 的铑配合物用于不对称氢化的机理研究。低温 NMR 研究以及使用 α-乙酰氨基肉桂酸甲酯作为标准模型底物的 DFT 计算揭示了反应途径和对映选择机制的新方面。
• Pharmaceutically relevant aromatic-cationic peptides
  申请人：Stealth BioTherapeutics Corp.

  公开号：US10221213B2

  公开（公告）日：2019-03-05

  The present technology provides peptides, methods of generating the peptides, and pharmaceutically acceptable salts of the peptides. In some embodiments, the peptide is D-Arg-2′6′-Dmt-Lys-Phe-NH2.

  本技术提供了多肽、生成多肽的方法以及多肽的药学上可接受的盐。在某些实施方案中，多肽是D-Arg-2′6′-Dmt-Lys-Phe-NH2。