(+)-(S)-1-乙基-2-氧代-4-甲氧基-3-环己烯-1-丙酸甲酯 | 1067884-95-0

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 中文名称: (+)-(S)-1-乙基-2-氧代-4-甲氧基-3-环己烯-1-丙酸甲酯
• 英文名称: (+)-(S)-1-Ethyl-2-oxo-4-methoxy-3-cyclohexene-1-propanoic acid methyl ester
• 英文别名: methyl 3-[(1S)-1-ethyl-4-methoxy-2-oxocyclohex-3-en-1-yl]propanoate
• CAS: 1067884-95-0
• 化学式: C₁₃H₂₀O₄
• 分子量: 240.299
• InChiKey: BVTCDWKIAQOEAJ-ZDUSSCGKSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.5
• 重原子数：
  17
• 可旋转键数：
  6
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.69
• 拓扑面积：
  52.6
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  (+)-(S)-1-乙基-2-氧代-4-甲氧基-3-环己烯-1-丙酸甲酯 在 盐酸 、 copper(l) iodide 、 sodium hydride 、 对甲苯磺酸 作用下， 以 四氢呋喃 、 六甲基磷酰三胺 、 甲苯 为溶剂， 反应 10.0h， 生成 (-)-(S)-<3-Ethyl-4-oxo-2,3,4,9-tetrahydro-1H-carbazol-3-yl>propanoic acid methyl ester
  参考文献：
  名称：

  Stereocontrolled Elaboration of Quaternary Carbon Centers through the Asymmetric Michael Reaction Using Chiral Imines: Enantioselective Synthesis of (+)-Aspidospermidine

  摘要：

  An enantioselective synthesis of (+)-aspidospermidine (1b) has been developed. The key strategic element was the stereocontrolled elaboration of quaternary carbon centers through the asymmetric Michael reaction, using chiral imines under neutral conditions. Thus, addition of imine 21, prepared from 2-ethylcyclohexanone and (R)-1-phenylethylamine, to methyl acrylate, led to cyclohexanone (S)-20 with 90% stereoselectivity (Scheme 3). The latter compound was then converted in six steps into dione 19 (Chart 6). Synthesis of [ABC]-type tricyclic carbazolone 18 was next accomplished, starting from this dione, by using the indole synthesis protocol developed by Suzuki. Critical to the success of this approach was the evolution, after extensive experimentation, of an efficient sequence for assembling D ring to carbazolone 18, having controlled during the events the ''natural'', cis CD ring junction. Thus, treatment of alcohol 57 with trifluoroacetic acid led to tetracycle 58 obtained as a single isomer with 94% yield (Chart 10). The intramolecular capture of a putative intermediary iminium ion, as illustrated in 52, by the carbamate nitrogen atom of 57 has been evoked to rationalize the observed stereoselectivity. The strategy we have adopted for the construction of the fifth E ring of 1b was in fact the methodology proposed by Magnus, based on an intramolecular Pummerer rearrangement (17 --> 59). Thus, synthesis of (+)-aspidospermidine (1b) has been achieved by a linear sequence of 22 chemical operations, starting with 2-ethylcyclohexanone, with an overall yield of 2.7%.

  DOI：

  10.1021/jo00088a008
• 作为产物：
  描述：

  tert-butyl 3-{(1S)-1-ethyl-4-[(S)-1-phenylethyl]amino-2-oxocyclohex-3-en-1-yl}propanoate 在 氯甲酸乙酯 、 sodium hydride 、 盐酸 作用下， 以 二氯甲烷 、 甲醇 为溶剂， 反应 38.0h， 以75%的产率得到(+)-(S)-1-乙基-2-氧代-4-甲氧基-3-环己烯-1-丙酸甲酯
  参考文献：
  名称：

  多米诺（Domino）迈克尔-克莱森（Michael-Claisen）双环化：一种强大的通用工具，可在环己烷-1,3-二酮的C4处引入四级立体中心，并完全合成各种系列的空间拥挤生物碱。

  摘要：

  在t-BuOH-THF（体积比为1：1）的t-BuOK（200 mol％）存在下，取代的丙酮衍生物与丙烯酸酯（> 200 mol％）的反应以级联过程进行，包括第一次迈克尔加成，第二次迈克尔加成和最后一个克莱森反应，得到4，4-二取代的环己烷-1，3-二酮。在该级联过程中，只有更多的取代的烯酸酯起迈克尔供体的作用，因此，酮在同一碳上占据了两个烷氧基羰基乙基，带有更多的取代基。此类中间体之后进行分子内克莱森反应，导致环己烷-1,3-二酮在C（4）处带有季立体中心，该中心带有烷氧基羰基乙基和起始丙酮衍生物的取代基。如此获得的4，4-二取代的环己烷-1，3-二酮已成功用于具有生物学意义的复杂生物碱的全合成，例如（+）-aspidospermidine，（+/-）-Galanthamine，（+/-）-lycoramine和（+/-）-mesembrine），均具有以下特点：第四纪立体成因中心。DF

  DOI：

  10.1021/jo801316s

文献信息

• Domino Double Michael−Claisen Cyclizations: A Powerful General Tool for Introducing Quaternary Stereocenters at C(4) of Cyclohexane-1,3-diones and Total Synthesis of Diverse Families of Sterically Congested Alkaloids
  作者：Teruhiko Ishikawa、Kazuhiro Kudo、Ken Kuroyabu、Satoshi Uchida、Takayuki Kudoh、Seiki Saito

  DOI：10.1021/jo801316s

  日期：2008.10.3

  Reactions of substituted acetone derivatives with acrylic acid esters (>200 mol %) in the presence of t-BuOK (200 mol %) in t-BuOH-THF (1:1 by volume) turned out to proceed as a cascade process consisting of the first Michael addition, the second Michael addition, and the last Claisen reaction to afford 4,4-disubstituted cyclohexane-1,3-diones. Only more substituted enolates play the role of a Michael

  在t-BuOH-THF（体积比为1：1）的t-BuOK（200 mol％）存在下，取代的丙酮衍生物与丙烯酸酯（> 200 mol％）的反应以级联过程进行，包括第一次迈克尔加成，第二次迈克尔加成和最后一个克莱森反应，得到4，4-二取代的环己烷-1，3-二酮。在该级联过程中，只有更多的取代的烯酸酯起迈克尔供体的作用，因此，酮在同一碳上占据了两个烷氧基羰基乙基，带有更多的取代基。此类中间体之后进行分子内克莱森反应，导致环己烷-1,3-二酮在C（4）处带有季立体中心，该中心带有烷氧基羰基乙基和起始丙酮衍生物的取代基。如此获得的4，4-二取代的环己烷-1，3-二酮已成功用于具有生物学意义的复杂生物碱的全合成，例如（+）-aspidospermidine，（+/-）-Galanthamine，（+/-）-lycoramine和（+/-）-mesembrine），均具有以下特点：第四纪立体成因中心。DF
• Stereocontrolled Elaboration of Quaternary Carbon Centers through the Asymmetric Michael Reaction Using Chiral Imines: Enantioselective Synthesis of (+)-Aspidospermidine
  作者：Didier Desmaeele、Jean d'Angelo

  DOI：10.1021/jo00088a008

  日期：1994.5

  An enantioselective synthesis of (+)-aspidospermidine (1b) has been developed. The key strategic element was the stereocontrolled elaboration of quaternary carbon centers through the asymmetric Michael reaction, using chiral imines under neutral conditions. Thus, addition of imine 21, prepared from 2-ethylcyclohexanone and (R)-1-phenylethylamine, to methyl acrylate, led to cyclohexanone (S)-20 with 90% stereoselectivity (Scheme 3). The latter compound was then converted in six steps into dione 19 (Chart 6). Synthesis of [ABC]-type tricyclic carbazolone 18 was next accomplished, starting from this dione, by using the indole synthesis protocol developed by Suzuki. Critical to the success of this approach was the evolution, after extensive experimentation, of an efficient sequence for assembling D ring to carbazolone 18, having controlled during the events the ''natural'', cis CD ring junction. Thus, treatment of alcohol 57 with trifluoroacetic acid led to tetracycle 58 obtained as a single isomer with 94% yield (Chart 10). The intramolecular capture of a putative intermediary iminium ion, as illustrated in 52, by the carbamate nitrogen atom of 57 has been evoked to rationalize the observed stereoselectivity. The strategy we have adopted for the construction of the fifth E ring of 1b was in fact the methodology proposed by Magnus, based on an intramolecular Pummerer rearrangement (17 --> 59). Thus, synthesis of (+)-aspidospermidine (1b) has been achieved by a linear sequence of 22 chemical operations, starting with 2-ethylcyclohexanone, with an overall yield of 2.7%.