ethyl (2R)-2-benzyl-2-methyl-3-oxobutanoate | 89656-90-6

• 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 (2R)-2-benzyl-2-methyl-3-oxobutanoate
• 英文别名: (R)-ethyl 2-benzyl-2-methylacetoacetate；ethyl (R)-2-benzyl-2-methylacetoacetate；ethyl (R)-2-benzyl-2-methyl-3-oxobutyrate
• CAS: 89656-90-6
• 化学式: C₁₄H₁₈O₃
• 分子量: 234.295
• InChiKey: QIZLWQIYZQZSHX-CQSZACIVSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  17
• 可旋转键数：
  6
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  43.4
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  ethyl (2R)-2-benzyl-2-methyl-3-oxobutanoate 在 sodium azide 、 甲烷磺酸 作用下， 以 乙二醇二甲醚 为溶剂， 反应 24.0h， 以82%的产率得到ethyl (2S)-2-acetylamino-2-methyl-3-phenylpropanoate
  参考文献：
  名称：

  Asymmetric synthesis of quaternary α-amino acids using d-ribonolactone acetonide as chiral auxiliary

  摘要：

  We describe a new simple methodology to prepare enantiopure alpha,alpha-dialkylglycines based on the use of commercially available D-ribonolactone as a chiral auxiliary. Enantiopure alpha-methyl and alpha-butyl series are prepared through diastereoselective alkylation and subsequent Schmidt rearrangement of alpha,alpha-dialkylacetoacetates of D-ribonolactone acetonide. Absolute configuration was assigned through preparation of enantiopure 4,4-disubstituted 3-methyl-2-pyrazolin-5-ones. (C) 1999 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(99)00457-7
• 作为产物：
  描述：

  2,3-O-isopropylidene-γ-D-ribonolactone 2-methylacetoacetate 在 titanium(IV) tetraethanolate 、 sodium hydride 作用下， 以 四氢呋喃 为溶剂， 反应 17.25h， 生成 ethyl (2R)-2-benzyl-2-methyl-3-oxobutanoate
  参考文献：
  名称：

  Asymmetric synthesis of quaternary α-amino acids using d-ribonolactone acetonide as chiral auxiliary

  摘要：

  We describe a new simple methodology to prepare enantiopure alpha,alpha-dialkylglycines based on the use of commercially available D-ribonolactone as a chiral auxiliary. Enantiopure alpha-methyl and alpha-butyl series are prepared through diastereoselective alkylation and subsequent Schmidt rearrangement of alpha,alpha-dialkylacetoacetates of D-ribonolactone acetonide. Absolute configuration was assigned through preparation of enantiopure 4,4-disubstituted 3-methyl-2-pyrazolin-5-ones. (C) 1999 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(99)00457-7

文献信息

• Asymmetric alkylation of .alpha.-alkyl .beta.-keto esters
  作者：Kiyoshi Tomioka、Kaori Ando、Yutaka Takemasa、Kenji Koga

  DOI：10.1021/ja00321a050

  日期：1984.5

  Diastereoselective alkylation de lithio enamines obtenues a partir d'α-alkyl β-cetoesters et du (S)-valinate de t-butyle

  非对映选择性烷基化脱硫烯胺减少部分 d'α-烷基 β-cetoesters et du (S)-valinate de t-butyle
• Application of (2R,3R)-dihydroxy-1,2,3,4-tetrahydronaphthalene to asymmetric synthesis
  作者：Fulvia Orsini、Sabina Rinaldi

  DOI：10.1016/s0957-4166(97)00088-8

  日期：1997.4

  (2R,3R)-Dihydroxy-tetrahydronaphthalene, prepared via an efficient chemoenzymatic procedure from naphthalene, has been successfully tested, as a chiral auxiliary in diastereoselective conjugate additions of lithium dialkylcuprates to alpha,beta-unsaturated esters and in stereoselective alkylations of beta-ketoesters. (C) 1997 Published by Elsevier Science Ltd.

  (2R,3R)-二羟基四氢萘，系通过一种高效化学酶法工艺从萘制备而成，已成功受试作为手性辅助剂，用于锂二烷基杯礁盐在α,β-不饱和酯中的反式选择性共轭加成以及在β-酮酯的立体选择性烷基化。版权 © 1997 由爱思唯尔科学有限公司出版。
• Stereoselective reactions. XXI. Asymmetric alkylation of α-alkyl β-keto esters to α,α-dialkyl β-keto esters having either (R)- or (S)-chiral quaternary center depending on the solvent system
  作者：Kaori Ando、Yataka Takemasa、Kiyoshi Tomioka、Kenji Koga

  DOI：10.1016/s0040-4020(01)80346-x

  日期：——

  Asymmetric alkylation reaction of chiral enamines prepared from alpha-alkyl beta-keto esters and (S)-valine tert-butyl ester leading to either enantiomer is described. Lithiated chiral enamines can be alkylated with alkyl halides in a toluene solvent in the presence of HMPA to give, after hydrolysis, alpha,alpha-dialkyl beta-keto esters in 70-99%ee. The reactions in the presence of THF, dioxolane, or trimethylamine. instead of HMPA, afford the corresponding antipodes with enantiomeric purities of 44-92%ee. The present method provides a procedure for the synthesis of both enantiomers of alpha,alpha-dialkyl beta-keto esters in high enantiomeric purities starting from the same chiral enamines.
• Asymmetric alkylation using chiral cyclic diols to prepare a quaternary carbon
  作者：Keisuke Kato、Hiroshi Suemune、Kiyoshi Sakai

  DOI：10.1016/s0040-4020(01)87012-5

  日期：1994.3

  Asymmetric alkylation of cyclic and acyclic beta-keto ester acetals (4, 5, 13, 14, and 18) with C-2-symmetric cycloalkane-1,2-dioxy moiety proceeded in a highly diastereoselective manner to afford enol ethers (9-12, 15-17, 19a-c) with a chiral quaternary carbon.
• Catalytic asymmetric alkylation of α-cyanocarboxylates and acetoacetates using a phase-transfer catalyst
  作者：Kazuhiro Nagata、Daisuke Sano、Yu Shimizu、Michiko Miyazaki、Takuya Kanemitsu、Takashi Itoh

  DOI：10.1016/j.tetasy.2009.10.018

  日期：2009.11

  The catalytic asymmetric alkylation of alpha-cyanocarboxylates and acetoacetates with an alkyl halide was performed under phase-transfer conditions to afford compounds which have a chiral quaternary carbon with up to 97% and 94% ee, respectively. As applications of this method, chiral 2-oxindole derivatives and a beta-lactam derivative were synthesized. (C) 2009 Elsevier Ltd. All rights reserved.