Methyl (E)-5-(2-methyl-1,3-dioxocyclopent-2-yl)-2-pentenoate | 66977-01-3

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: Methyl (E)-5-(2-methyl-1,3-dioxocyclopent-2-yl)-2-pentenoate
• 英文别名: (2E)-Methyl 5-(2'-methyl-1',3'-dioxocyclopent-2'-yl)-pent-2-enoate；methyl (E)-5-(1-methyl-2,5-dioxocyclopentyl)pent-2-enoate
• CAS: 66977-01-3
• 化学式: C₁₂H₁₆O₄
• 分子量: 224.257
• InChiKey: YKLWTPZFHBDQIO-HWKANZROSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1
• 重原子数：
  16
• 可旋转键数：
  5
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.58
• 拓扑面积：
  60.4
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  Methyl (E)-5-(2-methyl-1,3-dioxocyclopent-2-yl)-2-pentenoate 在 palladium on activated charcoal 、 baker's yeast 氢气 作用下， 以 水 、 二甲基亚砜 为溶剂， 反应 48.0h， 生成 5-((1S,2S)-2-Hydroxy-1-methyl-5-oxo-cyclopentyl)-pentanoic acid methyl ester
  参考文献：
  名称：

  Inversion of Diastereoselectivity Depending on Substrate Concentration in ­Baker’s Yeast Catalyzed Reduction of σ-Symmetrical 1,3-Cyclopentadiones and 1,3-Cyclohexadiones

  摘要：

  在面包酵母催化的β-对称性2,2-二烷基环戊烷-1,3-二酮1,2和环己烷-1,3-二酮20的还原反应中，首次观察到了由于底物浓度变化而导致的非对映选择性反转。随着底物浓度从8 mM增加到40 mM，选择性逐渐发生变化。同时，当在高底物浓度（40 mM）下进行反应时，酵母催化的还原反应应用于1的氢化产物（5）时，可以高产率得到单一非对映异构体。

  DOI：

  10.1055/s-2006-949647
• 作为产物：
  描述：

  2-甲基-1,3-环戊二酮 生成 Methyl (E)-5-(2-methyl-1,3-dioxocyclopent-2-yl)-2-pentenoate
  参考文献：
  名称：

  Inversion of Diastereoselectivity Depending on Substrate Concentration in ­Baker’s Yeast Catalyzed Reduction of σ-Symmetrical 1,3-Cyclopentadiones and 1,3-Cyclohexadiones

  摘要：

  在面包酵母催化的β-对称性2,2-二烷基环戊烷-1,3-二酮1,2和环己烷-1,3-二酮20的还原反应中，首次观察到了由于底物浓度变化而导致的非对映选择性反转。随着底物浓度从8 mM增加到40 mM，选择性逐渐发生变化。同时，当在高底物浓度（40 mM）下进行反应时，酵母催化的还原反应应用于1的氢化产物（5）时，可以高产率得到单一非对映异构体。

  DOI：

  10.1055/s-2006-949647

文献信息

• Reductive Cyclization of Ketones Tethered to Activated Olefins Mediated by Magnesium in Methanol
  作者：Ge Hyeong Lee、Eun Bok Choi、Eun Lee、Chwang Siek Pak

  DOI：10.1021/jo00085a036

  日期：1994.3

  The reductive cyclizations of various ketones tethered to activated olefins such as alpha,beta-unsaturated esters, nitriles, sulfoxides, and sulfides were mediated by magnesium in dry methanol in the presence of mercuric chloride. When treated with magnesium in dry methanol at -23-degrees-C all of the ketones except nitrile 9 (42%) and 5-oxa-8-keto-2-enoate 5 (13%) gave excellent yields (79-98%) of mono- and bicyclic alcohol products resulting from carbon-carbon bond formation between the beta-carbon of the activated olefin and the carbonyl carbon. The reaction was accelerated by the catalytic amount of mercuric chloride, although the stereoselectivity was not affected by the catalyst. For all the substrates except 8-keto-2-enoate 3 and 5-aza-8-keto-2-enoate 6, the configuration of the major product was trans between the hydroxy and (methoxycarbonyl)methyl groups. The product isomer ratios were independent of the substrate geometry (E or Z). In contrast to the ketones, aldehydes tethered to alpha,beta-unsaturated esters gave products of simple reduction of the double bond and/or saturated alcohols instead of the cyclized products. When the reaction temperature was lowered, the yields of cyclized product were significantly affected by the production of appreciable amounts of saturated product, but the stereoselectivity was not improved. Under the same reaction conditions alpha,beta-unsaturated sulfoxide 16 gave deoxygenated sulfide 18 (85%) as the major product along with a small amount (9%) of cyclized product 19t. In contrast, sulfone 17 underwent desulfonylation instead of cyclization to give olefin 20 (54%). With excess magnesium (15 equiv), however, alpha,beta-unsaturated sulfoxide 16 gave cyclized sulfide 19t (95%) via deoxygenated sulfide 18. Both 16Z and 16E afforded product 19t as a single isomer. It is suggested that the reductive cyclization of the alpha,beta-unsaturated esters and nitriles proceed by means of nucleophilic attack of a beta-carbon radical anion, formed by initial electron transfer from magnesium metal to the activated olefin, on the carbonyl group. The cyclization of the alpha,beta-unsaturated sulfide proceeds by nucleophilic attack of the ketyl on the olefinic double bond.
• Inversion of Diastereoselectivity Depending on Substrate Concentration in ­Baker’s Yeast Catalyzed Reduction of σ-Symmetrical 1,3-Cyclopentadiones and 1,3-Cyclohexadiones
  作者：Manabu Node、Takahiro Katoh、Shinsuke Mizumoto、Masato Fudesaka、Yuki Nakashima、Tetsuya Kajimoto

  DOI：10.1055/s-2006-949647

  日期：2006.9

  Inversion of diastereoselectivity caused by a change in substrate concentration was first observed in baker’s yeast catalyzed reduction of σ-symmetrical 2,2-dialkylated cyclopentan-1,3-diones 1,2 and cyclohexan-1,3-dione 20. The selectivity altered by degrees depending on the substrate concentration from 8 mM to 40 mM. Meanwhile, application of the yeast-catalyzed reduction to the hydrogenated compound (5) of 1 afforded a single diastereomer in good yield when the reaction was conducted in high substrate ­concentration (40 mM).

  在面包酵母催化的β-对称性2,2-二烷基环戊烷-1,3-二酮1,2和环己烷-1,3-二酮20的还原反应中，首次观察到了由于底物浓度变化而导致的非对映选择性反转。随着底物浓度从8 mM增加到40 mM，选择性逐渐发生变化。同时，当在高底物浓度（40 mM）下进行反应时，酵母催化的还原反应应用于1的氢化产物（5）时，可以高产率得到单一非对映异构体。