(2S)-2-methyl-3-phenylpropanal

• 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: (2S)-2-methyl-3-phenylpropanal
• 英文别名: (S)-2-methyl-3-phenylpropanal
• 化学式: C₁₀H₁₂O
• 分子量: 148.205
• InChiKey: HEPHYCJJLAUKSB-VIFPVBQESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.2
• 重原子数：
  11
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.3
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  (2S)-2-methyl-3-phenylpropanal 在 水 、 铬酸 作用下， 以 乙醚 为溶剂， 反应 2.0h， 以90%的产率得到2-methyl-3-phenylpropionic acid
  参考文献：
  名称：

  Chiral synthesis via organoboranes. 30. Facile synthesis, by the Matteson asymmetric homologation procedure, of .alpha.-methyl boronic acids not available from asymmetric hydroboration and their conversion into the corresponding aldehydes, ketones, carboxylic acids, and amines of high enantiomeric purity

  摘要：

  2-(alpha-Methylalkyl)- or 2-(alpha-arylethyl)-1,3,2-dioxaborinanes, RMeHC*BO2(CH2)3 (R = alkyl or aryl), of very high enantiomeric purity, not available from asymmetric hydroboration, can be prepared by the Matteson asymmetric homologation procedure of optically pure pinanediol or 2,3-butanediol boronate esters with (dichloromethyl)lithium, LiCHCl2, conveniently generated in situ in THF at -78-degrees-C, followed by reaction with either a Grignard reagent or an alkyllithium, with subsequent removal of the chiral auxiliaries. alpha-Methyl boronic esters thus obtained are readily converted into the corresponding aldehydes by the reaction with [methoxy(phenylthio)methyl]lithium [LiCH(OMe)SPh] (MPML) and mercuric chloride, followed by oxidation with hydrogen peroxide in a pH 8 buffer medium. The two-phase aqueous chromic acid procedure can be used to oxidize these aldehydes to the corresponding alpha-methyl carboxylic acids of very high enantiomeric purity without significant racemization. Additionally, pinanediol or 2,3-butanediol alpha-methylorganylboronate esters can be conveniently converted into borinic ester derivatives, RMeHC*BMe(OMe), of very high enantiomeric purity by reaction with methyllithium, followed by treatment with methanolic hydrogen chloride and subsequent recovery of the valuable chiral auxiliaries. These borinic ester derivatives are converted into alpha-methyl ketones and alpha-methyl primary amines of known absolute configuration by the alpha,alpha-dichloromethyl methyl ether (DCME) reaction and the reaction with hydroxylamine-O-sulfonic acid, respectively. The present synthesis of chiral 2-organyl-1,3,2-dioxaborinanes by the Matteson route, together with our direct asymmetric hydroboration procedure, makes it possible to synthesize many chiral boronic acid derivatives in very high enantiomeric purities. These complementary procedures greatly expand the scope of asymmetric synthesis via chiral organoboranes.

  DOI：

  10.1021/jo00010a022
• 作为产物：
  描述：

  (S)-4-苄基-3-(3-苯基丙酰基)噁唑烷丁-2-酮 在 lithium aluminium tetrahydride 、 草酰氯 、 sodium hexamethyldisilazane 作用下， 以 四氢呋喃 、 乙醚 、 二氯甲烷 、 二甲基亚砜 为溶剂， 反应 20.16h， 生成 (2S)-2-methyl-3-phenylpropanal
  参考文献：
  名称：

  Dess-Martin高碘烷氧化重排制备α-酮硫代酸酯†

  摘要：

  发现了由Dess-Martin高碘烷（DMP）介导的氧化重排反应。该反应通过将β-羟基硫代酯氧化为β-酮硫代酯，然后进行α-羟基化，然后进一步氧化以形成邻位硫代酯三羰基来进行。然后该产物重排，挤出CO 2，形成α-酮产物。使用13 C标记和中间体以及反应产物的分析阐明了重排的机理。这种有效的方法使得易于制备α-酮硫酯，α-酮硫酯是药学上重要的杂环支架例如喹喔啉酮的合成中的潜在中间体。

  DOI：

  10.1039/c7ob02959d

文献信息

• [EN] OXADIAZOLE COMPOUNDS WHICH INHIBIT BETA-SECRETASE ACTIVITY AND METHODS OF USE THEREOF<br/>[FR] COMPOSÉS OXADIAZOLE QUI INHIBENT L'ACTIVITÉ DE LA BÊTA-SECRÉTASE, ET LEURS PROCÉDÉS D'UTILISATION
  申请人：COMENTIS INC

  公开号：WO2012054510A1

  公开（公告）日：2012-04-26

  The invention provides novel beta-secretase inhibitors and methods for their including methods of treating Alzheimer's disease.

  这项发明提供了新型β-分泌酶抑制剂以及它们的方法，包括治疗阿尔茨海默病的方法。
• Focused Directed Evolution of Pentaerythritol Tetranitrate Reductase by Using Automated Anaerobic Kinetic Screening of Site-Saturated Libraries
  作者：Martyn E. Hulley、Helen S. Toogood、Anna Fryszkowska、David Mansell、Gill M. Stephens、John M. Gardiner、Nigel S. Scrutton

  DOI：10.1002/cbic.201000527

  日期：2010.11.22

  Members of the library: Multiple site‐saturated libraries of PETN reductase (shown) were screened for improved kinetic rate against a variety of poorly reduced α,β‐unsaturated activated alkenes by using an anaerobic robotics facility. Two mutants (T26S and W102F) showed a switch in product enantiopreference with substrates (E)‐2‐phenyl‐1‐nitropropene and α‐methyl‐trans‐cinnamaldehyde, respectively

  文库成员：通过使用厌氧机器人设备，筛选了多个位点饱和的 PETN 还原酶文库（如图所示），以提高对各种还原程度较差的 α,β-不饱和活化烯烃的动力学速率。两个突变体（T26S 和 W102F）分别显示了与底物 ( E )-2-苯基-1-硝基丙烯和 α-甲基-反式-肉桂醛的产物对映体偏好的转换。
• SuperQuat N-acyl-5,5-dimethyloxazolidin-2-ones for the asymmetric synthesis of α-alkyl and β-alkyl aldehydes
  作者：Steven D. Bull、Stephen G. Davies、Rebecca L. Nicholson、Hitesh J. Sanganee、Andrew D. Smith

  DOI：10.1039/b305623f

  日期：——

  yields and in high ee (generally > 95% ee). This methodology is exemplified by the asymmetric synthesis of (R)-3-isopropenylhept-6-enal, which has previously been used in the synthesis of (3Z,6R)-3-methyl-6-isopropenyl-3,9-decadien-1-yl acetate, a component of the sex pheromones of the California red scale.

  （S）-4-苄基-5,5-二甲基-，（S）-4-苯基-5,5-二甲基-，（S S）-4-异丙基-5,5-二甲基-，（S）-4-苄基-和（S）-4-苄基-5,5-二苯基-恶唑烷-2-酮可直接生成2-苄基-3研究了用DIBAL还原氢化物时的-苯基丙醛。（S）-4-苄基-5,5-二甲基衍生物被证明是抑制内环亲核攻击的最佳选择，还原后得到高产率的2-苄基-3-苯基丙醛。该方法在通过一系列（S）-N-酰基-4-苄基-5,5-二甲基恶唑烷-2-酮的非对映选择性烯醇烷基化反应进行不对称合成手性醛中的应用，得到并排列了α-取代的N -酰基-5，5-二甲基恶唑烷-2-酮（85-94％de），随后用DIBAL还原，可直接得到非外消旋的α-取代醛，而不会损失立体化学完整性（87-94％ee）。通过非对映选择性共轭向（S）-N-酰基-4-苯基-5,5-二甲基恶唑烷酮-2-酮（S）-N-酰基-4-苯基-5,5-二甲
• Non-destructive Removal of the Bornanesultam Auxiliary in ?-SubstitutedN-Acylbornane-10,2-sultanis under Mild Conditions: An efficient synthesis of enantiomerically pure ketones and aldehydes
  作者：Wolfgang Oppolzer、Christophe Darcel、Patrick Rochet、Stephane Rosset、Jef De Brabander

  DOI：10.1002/hlca.19970800502

  日期：1997.8.11

  two-step procedure involving a known mercaptolysis reaction followed by an [Fe(acac)3]-mediated coupling of the resulting S-benzyl thioesters with Grignard reagents. Furthermore, enantiomerically pure aldehydes 23 can be obtained from α-substituted N-acylbornane-10,2-sultams 6via a one-step reduction with (i-Bu)2AIH. No epimerization at the α-chiral center is observed during the cleavage reaction whereby

  α-替补Ñ -acylbornane-10，2 -sultams 6,9，和10可以被转换成纯对映异构体酮5. 13，和14，分别经由涉及已知mercaptolysis反应，随后通过的[Fe两步过程（acac）3 ]-介导的所得S-苄基硫酯与格氏试剂的偶联。此外，对映体纯的醛23可以通过（i-Bu）2的一步还原从α-取代的N-酰基冰片烷-10,2-杜鹃花6获得。AIH。在切割反应过程中未观察到在α-手性中心的差向异构体，由此回收了手性助剂，硼烷-10，2-sultam 1或ent - 1。通过使用这种方法，可以制备几种天然产物或其前体。
• Easily Accessible and Highly Tunable Bisphosphine Ligands for Asymmetric Hydroformylation of Terminal and Internal Alkenes
  作者：Kun Xu、Xin Zheng、Zhiyong Wang、Xumu Zhang

  DOI：10.1002/chem.201304684

  日期：2014.4.7

  An efficient methodology for synthesizing a small library of easily tunable and sterically bulky ligands for asymmetric hydroformylation (AHF) has been reported. Five groups of alkene substrates have been tested with excellent conversions, moderate‐to‐excellent regio‐ and enantioselectivities. Among the best result of the reported literature, application of ligand 1 c in the highly selective AHF of

  已经报道了一种有效的方法，该方法可合成用于不对称加氢甲酰化（AHF）的易于调节且空间庞大的配体的小文库。已测试了五组烯烃底物，具有优异的转化率，中等至出色的区域选择性和对映选择性。在所报道文献的最佳结果中，将配体1c应用于具有挑战性的底物2,5-二氢呋喃的高选择性AHF中，产生了几乎一种异构体，转化率高达99％，对映体过量（ee）高达92％ 。使用相同的配体可实现二氢吡咯底物的高度对映选择性AHF，ee高达95％  ，β-异构体/α-异构体比率高达> 1:50。