methyl 2-(acetylamino)-5-methylhex-2-enoate | 171556-72-2

• 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: methyl 2-(acetylamino)-5-methylhex-2-enoate
• 英文别名: methyl (Z)-2-acetamido-5-methylhex-2-enoate
• CAS: 171556-72-2
• 化学式: C₁₀H₁₇NO₃
• 分子量: 199.25
• InChiKey: VPRQXLRZNVWAMM-TWGQIWQCSA-N

物化性质

• 沸点：
  350.0±34.0 °C(Predicted)
• 密度：
  1.012±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.6
• 重原子数：
  14
• 可旋转键数：
  5
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.6
• 拓扑面积：
  55.4
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  methyl 2-(acetylamino)-5-methylhex-2-enoate 在 bis(1,5-cyclooctadiene)rhodium(I) tetrafluoroborate (S,S)-2,2''-bis[(R)-1-(diethylphosphino)ethyl]-1,1'-biferrocene 、 氢气 作用下， 以 1,2-二氯乙烷 为溶剂， 反应 24.0h， 生成 methyl (S)-2-(N-acetylamino)-5-methylhexanoate 、 methyl (R)-2-(N-acetylamino)-5-methylhexanoate
  参考文献：
  名称：

  使用 TRAP 转螯合手性双膦配体催化 α-（乙酰氨基）丙烯酸酯的不对称氢化：配体 P 取代基和氢气压力对对映选择性的显着影响

  摘要：

  用 [Rh(cod)2]BF4 和反式螯合手性双膦配体 (S,S)-2,2'-双 [( R)-1-(二烷基膦基)乙基]-1,1'-二茂铁[(R,R)-(S,S)-TRAPs]。在β-未取代或β-单取代的α-(乙酰氨基)丙烯酸酯[(E)-RCH=C(NHAc)CO2Me]的反应中，(R)-氢化产物的选择性随着底物β-空间需求的降低而增加取代基和配体 P 取代基以及降低氢压。在 60 °C 和 0.5 kg cm-2 氢气压力下与 EtTRAP-铑催化剂反应的 (R)-产物的选择性如下：R = H，96% ee；R = Me，92% ee；R = Ph，77% ee；R = i-Pr，57% ee。显着的空间和压力效应导致 2-(N-乙酰氨基) 肉桂酸甲酯 (R = Ph) 反应中对映选择性的显着逆转。例如，在 60 °C 和 0.1 kg cm-2 氢气压力下使用 EtTRAP 的选择性为 87%

  DOI：

  10.1246/bcsj.73.2571
• 作为产物：
  描述：

  5-甲氧基-2-甲基-1,3-恶唑 在 盐酸 作用下， 以 二氯甲烷 、 苯 为溶剂， 反应 51.0h， 生成 methyl 2-(acetylamino)-5-methylhex-2-enoate
  参考文献：
  名称：

  Synthesis of erythro-α-Amino β-hydroxy Carboxylic Acid Esters by Diastereoselective Photocycloaddition of 5-Methoxyoxazoles with Aldehydes

  摘要：

  A new photoaldol route to alpha-amino-beta-hydroxy carboxylic acid esters is initiated by the photocycloaddition of aromatic or aliphatic aldehydes to 5-methoxyoxazoles. The 4-unsubstituted 5-methyloxazole 1 gave the cycloadducts 8a-f in high yields and excellent exo-diastereoselectivities. Hydrolysis of 8a-f gives the N-acetyl alpha-amino-beta-hydroxy esters 9a-f, which could be subsequently converted into the corresponding Z-didehydro alpha-amino acids 10a-f. Quartenary alpha-amino-beta-hydroxy esters 12, 14, 16, 18, and 20, which are stable against dehydration, were obtained from the 4-alkylated 5-methoxyoxazoles 2-6, in most cases highly erythro-selective due to the high degree of stereocontrol (exo) at the photocycloaddition (to give 11, 13, 15, 17, and 19) level. The relative configurations of the N-acetyl alpha-amino-beta-hydroxy esters were determined by NMR spectroscopy and comparison with chiral pool-derived compounds as well as by X-ray structure determination of the ester 23, formed by hydrolysis of the cycloadduct 22, derived from photocycloaddition of propionaldehyde to the isoleucine-derived oxazole 21.

  DOI：

  10.1021/jo034830h

文献信息

• Catalytic Asymmetric Hydrogenation of<b><i>α</i></b>-(Acetamido)acrylates Using TRAP Trans-Chelating Chiral Bisphosphine Ligands: Remarkable Effects of Ligand<b><i>P</i></b>-Substituent and Hydrogen Pressure on Enantioselectivity
  作者：Ryoichi Kuwano、Masaya Sawamura、Yoshihiko Ito

  DOI：10.1246/bcsj.73.2571

  日期：2000.11

  β-substituent and the ligand P-substituent as well as decreasing hydrogen pressure. The selectivity for the (R)-product in the reaction with EtTRAP-rhodium catalyst at 60 °C and 0.5 kg cm-2 of hydrogen pressure was as follows: R = H, 96% ee; R = Me, 92% ee; R = Ph, 77% ee; R = i-Pr, 57% ee. The remarkable steric and pressure effects caused a dramatic reversal of enantioselectivity in the reaction of methyl

  用 [Rh(cod)2]BF4 和反式螯合手性双膦配体 (S,S)-2,2'-双 [( R)-1-(二烷基膦基)乙基]-1,1'-二茂铁[(R,R)-(S,S)-TRAPs]。在β-未取代或β-单取代的α-(乙酰氨基)丙烯酸酯[(E)-RCH=C(NHAc)CO2Me]的反应中，(R)-氢化产物的选择性随着底物β-空间需求的降低而增加取代基和配体 P 取代基以及降低氢压。在 60 °C 和 0.5 kg cm-2 氢气压力下与 EtTRAP-铑催化剂反应的 (R)-产物的选择性如下：R = H，96% ee；R = Me，92% ee；R = Ph，77% ee；R = i-Pr，57% ee。显着的空间和压力效应导致 2-(N-乙酰氨基) 肉桂酸甲酯 (R = Ph) 反应中对映选择性的显着逆转。例如，在 60 °C 和 0.1 kg cm-2 氢气压力下使用 EtTRAP 的选择性为 87%
• Synthesis of <i>e</i><i>rythro</i>-α-Amino β-hydroxy Carboxylic Acid Esters by Diastereoselective Photocycloaddition of 5-Methoxyoxazoles with Aldehydes
  作者：Axel G. Griesbeck、Samir Bondock、Johann Lex

  DOI：10.1021/jo034830h

  日期：2003.12.1

  A new photoaldol route to alpha-amino-beta-hydroxy carboxylic acid esters is initiated by the photocycloaddition of aromatic or aliphatic aldehydes to 5-methoxyoxazoles. The 4-unsubstituted 5-methyloxazole 1 gave the cycloadducts 8a-f in high yields and excellent exo-diastereoselectivities. Hydrolysis of 8a-f gives the N-acetyl alpha-amino-beta-hydroxy esters 9a-f, which could be subsequently converted into the corresponding Z-didehydro alpha-amino acids 10a-f. Quartenary alpha-amino-beta-hydroxy esters 12, 14, 16, 18, and 20, which are stable against dehydration, were obtained from the 4-alkylated 5-methoxyoxazoles 2-6, in most cases highly erythro-selective due to the high degree of stereocontrol (exo) at the photocycloaddition (to give 11, 13, 15, 17, and 19) level. The relative configurations of the N-acetyl alpha-amino-beta-hydroxy esters were determined by NMR spectroscopy and comparison with chiral pool-derived compounds as well as by X-ray structure determination of the ester 23, formed by hydrolysis of the cycloadduct 22, derived from photocycloaddition of propionaldehyde to the isoleucine-derived oxazole 21.