7-(pentylcarbonyl)oxy-4-methyl-2H-1-benzopyran-2-one | 17695-47-5

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 香豆素及其衍生物
• 英文名称: 7-(pentylcarbonyl)oxy-4-methyl-2H-1-benzopyran-2-one
• 英文别名: 4-methylumbelliferyl hexanoate；7-hexanoyloxy-4-methyl-coumarin；7-Hexanoyloxy-4-methyl-cumarin；4-Methyl-2-oxo-2H-1-benzopyran-7-yl hexanoate；(4-methyl-2-oxochromen-7-yl) hexanoate
• CAS: 17695-47-5
• 化学式: C₁₆H₁₈O₄
• 分子量: 274.317
• InChiKey: ZYHUMWMEIHQRIT-UHFFFAOYSA-N

物化性质

• 沸点：
  417.0±40.0 °C(Predicted)
• 密度：
  1.149±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.9
• 重原子数：
  20
• 可旋转键数：
  6
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.38
• 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：

  7-(pentylcarbonyl)oxy-4-methyl-2H-1-benzopyran-2-one 在 porcine liver esterase 作用下， 生成 羟甲香豆素
  参考文献：
  名称：

  Determination and Isolation of a Thioesterase from Passion Fruit (Passiflora edulis Sims) That Hydrolyzes Volatile Thioesters

  摘要：

  Volatile organosulfur compounds (VOSCs) are high impact aroma chemicals characteristic of tropical fruits which are active as both free thiols and the respective thioesters. Using a simple and sensitive colorimetric enzyme assay, a thioesterase activity toward VOSCs has been identified in ripening purple passion fruit (Passiflora edulis Sims). The assay was based on determining the release of free thiols from 2-methyl-3-furanthiol acetate using Ellman's reagent. The major thioesterase in the fruit was found to be a wall-bound protein in the mesocarp. The extracted enzyme activity was purified 150-fold and shown to be associated with a 43 kDa monomeric serine hydrolase which was selectively labeled with a fluorophosphonate suicide probe. MS-MS sequencing identified the thioesterase as a class 13 glycoside hydrolase, most similar to pectin acetylesterase, an enzyme involved in cell wall modifications in the peel of a number of fruit. Our results suggest that cell wall hydrolases in tropical fruit may have additional useful roles in biotransforming VOSCs.

  DOI：

  10.1021/jf800793q
• 作为产物：
  描述：

  羟甲香豆素 、 己酰氯 在 sodium hydride 作用下， 以 四氢呋喃 为溶剂， 反应 2.0h， 以51%的产率得到7-(pentylcarbonyl)oxy-4-methyl-2H-1-benzopyran-2-one
  参考文献：
  名称：

  固体支持物上的高通量，小体积酶分析。

  摘要：

  描述了一种高通量酶测定法，该测定法每次测试使用1微升或更少的酶溶液。酶溶液通过机器人处理以超过1000次/小时的处理量沉积在已预浸渍有荧光底物的硅胶板表面上。通过荧光定量反应。该方法与水不溶性底物（脂肪酶），水溶性底物（糖苷酶），全蛋白底物（蛋白酶）和酶抑制测量兼容。水解不稳定的伞形酯可用于以这种形式测定脂肪酶，而无需进行背景水解。通过对37种不同的荧光酯底物进行脂肪酶和酯酶的指纹分析，测试了高通量和可重复性。

  DOI：

  10.1021/ac048611n

文献信息

• Structure activity studies with xenobiotic substrates using carboxylesterases isolated from Arabidopsis thaliana
  作者：Ian Cummins、Marie Landrum、Patrick G. Steel、Robert Edwards

  DOI：10.1016/j.phytochem.2006.12.014

  日期：2007.3

  cloned, expressed and the purified recombinant proteins assayed for esterase activity with xenobiotic substrates. Two members, AtCXE5 and AtCXE18 were found to be active carboxylesterases, though AtCXE5 proved to be highly unstable as a soluble protein. AtCXE18 and the previously characterised S-formylglutathione hydrolase from Arabidopsis (AtSFGH) were assayed against a series of esters based on methylumbelliferone

  羧酸酯酶 (CXE) 催化异生物质和天然产物的水解，从根本上改变它们的生物活性。虽然动物 CXE 的底物选择性，如猪肝酯酶 (PLE) 已得到充分研究，但植物中的相应酶尚未确定，其活性尚未确定。使用拟南芥 (At) 作为来源，已经克隆、表达了 α/β 水解酶 AtCXE 蛋白质家族的五个代表性成员，并用异生物质底物测定了纯化的重组蛋白的酯酶活性。两个成员 AtCXE5 和 AtCXE18 被发现是有活性的羧酸酯酶，尽管 AtCXE5 作为可溶性蛋白质被证明是高度不稳定的。AtCXE18 和先前表征的来自拟南芥 (AtSFGH) 的 S-甲酰谷胱甘肽水解酶针对一系列基于甲基伞形酮的酯进行了测定，其中酰基部分的大小和构象各不相同。使用同一系列测定拟南芥植物的粗酯酶制剂，并将结果与​​常用的 PLE 获得的结果进行比较。对于直链酯，AtCXE18 的行为类似于 PLE，但拟南芥水解酶证明对支链酰
• Threshold Dependence of Mortality Effects for Fine and Coarse Particles in Phoenix, Arizona
  作者：Richard L. Smith、Dan Spitzner、Yuntae Kim、Montserrat Fuentes

  DOI：10.1080/10473289.2000.10464172

  日期：2000.8

  Daily data for fine (<2.5 mu m) and coarse (2.5-10 mu m) particles are available for 1995-1997 from the U.S. Environmental Protection Agency (EPA) research monitor in Phoenix, AZ. Mortality effects on the 65 and over population were studied for both the city of Phoenix and for a region of about 50 mi around Phoenix. Coarse particles in Phoenix are believed to be natural in origin and spatially homogeneous, whereas fine particles are primarily vehicular in origin and concentrated in the city itself. For this reason, it is natural to focus on city mortality data when considering fine particles, and on region mortality data when considering coarse particles, and most of the results reported here correspond to those assignments.After allowing for seasonality and long-term trend through a nonlinear (B-spline) trend curve, and also for meteorological effects based on temperature and specific humidity, a regression of mortality was performed on PM using several different measures for PM. Based on a linear PM effect, we found a statistically significant coefficient for coarse particles, but not for fine particles, contrary to what is widely believed about the effects of coarse and fine particles. An analysis of nonlinear pollution-mortality relationships, however, suggests that the true picture is more complicated than that. For coarse particles, the evidence for any nonlinear or threshold-based effect is slight. For fine particles, we found evidence of a threshold, most likely with values in the range of 20-25 mu g/m(3). We also found some evidence of interactions of the PM effects with season and year.The main effect here is an apparent seasonal interaction in the coarse PM effect. An attempt was made to explain this in terms of seasonal variation in the chemical composition of PM, but this led to another counterintuitive result: the PM effect is highest in spring and summer, when the anthropogenic concentration of coarse PM is lowest as determined by a principal components analysis. There was no evidence of confounding between the fine and coarse PM effects. Although these results are based on one city and should be considered tentative until replicated in other studies, they suggest that the prevailing focus on fine rather than coarse particles may be an oversimplification. The study also shows that consideration of nonlinear effects can lead to real changes of interpretation and raises the possibility of seasonal effects associated with the chemical composition of PM.
• Determination and Isolation of a Thioesterase from Passion Fruit (Passiflora edulis Sims) That Hydrolyzes Volatile Thioesters
  作者：Edward J. Tapp、Ian Cummins、David Brassington、Robert Edwards

  DOI：10.1021/jf800793q

  日期：2008.8.1

  Volatile organosulfur compounds (VOSCs) are high impact aroma chemicals characteristic of tropical fruits which are active as both free thiols and the respective thioesters. Using a simple and sensitive colorimetric enzyme assay, a thioesterase activity toward VOSCs has been identified in ripening purple passion fruit (Passiflora edulis Sims). The assay was based on determining the release of free thiols from 2-methyl-3-furanthiol acetate using Ellman's reagent. The major thioesterase in the fruit was found to be a wall-bound protein in the mesocarp. The extracted enzyme activity was purified 150-fold and shown to be associated with a 43 kDa monomeric serine hydrolase which was selectively labeled with a fluorophosphonate suicide probe. MS-MS sequencing identified the thioesterase as a class 13 glycoside hydrolase, most similar to pectin acetylesterase, an enzyme involved in cell wall modifications in the peel of a number of fruit. Our results suggest that cell wall hydrolases in tropical fruit may have additional useful roles in biotransforming VOSCs.
• A High-Throughput, Low-Volume Enzyme Assay on Solid Support
  作者：Peter Babiak、Jean-Louis Reymond

  DOI：10.1021/ac048611n

  日期：2005.1.1

  water-soluble substrates (glycosidases), whole-protein substrates (proteases), and enzyme inhibition measurements. Hydrolytically labile umbelliferyl esters can be used to assay lipases in this format without background hydrolysis. High throughput and reproducibility were tested by fingerprint analysis of lipases and esterases against 37 different fluorogenic ester substrates. A set of eight fluorogenic unbelliferyl

  描述了一种高通量酶测定法，该测定法每次测试使用1微升或更少的酶溶液。酶溶液通过机器人处理以超过1000次/小时的处理量沉积在已预浸渍有荧光底物的硅胶板表面上。通过荧光定量反应。该方法与水不溶性底物（脂肪酶），水溶性底物（糖苷酶），全蛋白底物（蛋白酶）和酶抑制测量兼容。水解不稳定的伞形酯可用于以这种形式测定脂肪酶，而无需进行背景水解。通过对37种不同的荧光酯底物进行脂肪酶和酯酶的指纹分析，测试了高通量和可重复性。