methyl 4,4-difluoro-4-chloro-2-butynoate | 143706-83-6

• 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 4,4-difluoro-4-chloro-2-butynoate
• 英文别名: Methyl 4-chloro-4,4-difluorobut-2-ynoate
• CAS: 143706-83-6
• 化学式: C₅H₃ClF₂O₂
• 分子量: 168.527
• InChiKey: JKXKXZDFSMLRMU-UHFFFAOYSA-N

物化性质

• 沸点：
  129.1±40.0 °C(predicted)
• 密度：
  1.402±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.9
• 重原子数：
  10
• 可旋转键数：
  1
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  26.3
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  methyl 4,4-difluoro-4-chloro-2-butynoate 在 sodium hydroxide 、 硝酸 作用下， 以 二氯甲烷 为溶剂， 反应 0.25h， 生成 methyl 5-(chlorodifluoromethyl)-3-(2,4-difluoro-5-nitrophenyl)-4-isoxazolecarboxylate
  参考文献：
  名称：

  Synthesis and Herbicidal Activity of 3-Aryl-5-(haloalkyl)-4-isoxazolecarboxamides and Their Derivatives

  摘要：

  A series of unique 3-aryl-5-(haloalkyl)-4-isoxazolecarboxamides have been prepared which exhibit, in both greenhouse and field studies, significant preemergent and postemergent herbicidal activity in the grams per hectare range against broadleaf and narrowleaf weeds. The key step in the formation of the fully substituted isoxazole ring 2 is 1,3 dipolar cycloaddition of a haloalkyl-substituted acetylenic ester and a nitrile oxide intermediate. The 3-aryl-5-(halo alkyl)-4-isoxazolecarboxylate esters 2 are converted to isoxazole-4-carboxamide herbicides 5 and 6, secondary amides 7, and amino acid derivatives 8. Greatest activity was observed with compounds having a combination of three substituents: a substituted phenyl ring in the 3-position, a primary or secondary carboxamide in the 4-position, and a difluorochloromethyl group in the, 5-position of the isoxazole ring.

  DOI：

  10.1021/jf00049a040
• 作为产物：
  描述：

  4-Chloro-4,4-difluoro-3-oxo-2-(triphenyl-λ⁵-phosphanylidene)-butyric acid methyl ester 150.0~220.0 ℃ 、1.33 kPa 条件下， 以66%的产率得到methyl 4,4-difluoro-4-chloro-2-butynoate
  参考文献：
  名称：

  Cyclocondensation of alkylhydrazines and .beta.-substituted acetylenic esters: synthesis of 3-hydroxypyrazoles

  摘要：

  Addition of monosubstituted alkylhydrazines to acetylenic esters with either electron-withdrawing or sterically bulky beta-substituents afforded 1-alkyl-3-hydroxy-5-substituted-pyrazoles 1 as the major regioisomeric product. By comparison, the classical cyclocondensation of alkylhydrazines with beta-keto esters gives the regioisomeric pyrazol-5-ones 2. The reaction solvent employed in these cyclocondensations can have a profound effect on regioisomeric product ratios. Addition of methylhydrazine to 5g in methylene chloride gave regiospecific formation of pyrazolinone 2o, whereas addition in water-methanol mixtures afforded hydroxypyrazole 1o as the major product. Structural assignment of regioisomers 1 and 2 are based on C-13 NMR chemical shifts, long-range heteronuclear coupling constants, and comparisons with regiochemically known hydroxypyrazoles and/or pyrazolinones. Additions of acetylene 5b to 1,1-dimethylhydrazine afforded either acyclic enehydrazone 12 or pyrazolium betaine 13 depending on the reaction conditions.

  DOI：

  10.1021/jo00047a021

文献信息

• Reaction of benzohydroximinoyl chlorides and β-(trifluoromethyl)-acetylenic esters: Synthesis of regioisomeric (trifluoromethyl)-isoxazolecarboxylate esters and oxime addition products
  作者：Bruce C. Hamper、Kindrick L. Leschinsky

  DOI：10.1002/jhet.5570400404

  日期：2003.7

  triethylamine induced reaction of benzohydroximinoyl chlorides, precursors of nitrile oxides, with β-trifluoromethylacetylenic esters gives rise to three products: 5-trifluoromethyl-4-isoxozolecarboxylate esters, regioisomeric 4-trifluoromethyl-5-isoxazolecarboxylate esters and an unexpected oxime 1,4-addition adduct. Product distribution is rationalized in terms of two competing reaction modes, either 1

  由三乙胺引起的苯甲酰氢氧甲烷酰氯（腈的前体）与β-三氟甲基乙炔酸酯的反应产生三种产物：5-三氟甲基-4-异恶唑羧酸酯，区域异构的4-三氟甲基-5-异恶唑羧酸酯和意外的1,4-肟另外的加合物。根据两种竞争反应模式合理化了产品分布，可以是在乙炔酸酯中1,4加入肟阴离子，或在形成腈氧化物之后再进行1,3偶极环氧化。在低温下，优选将氧亚氨基酰氯与炔属酸酯进行阴离子1,4-加成，而在高于0°C的温度下，优选先形成氧化腈，然后进行环加成。13 C NMR。
• Synthesis of Polyfluoroalkyl Cyclobutenes from 3-Aza-1,5-enynes via an Aza-Claisen Rearrangement/Cyclization Cascade
  作者：Xiaoyi Xin、Dongping Wang、Fan Wu、Chunxiang Wang、Haolong Wang、Xincheng Li、Boshun Wan

  DOI：10.1021/ol4020738

  日期：2013.9.6

  A facile synthetic route to access polyfluoroalkyl functionalized cyclobutenes bearing an exo cyclic double bond from 3-aza-1,5-enynes is reported. The reaction proceeds via a thermal aza-Claisen rearrangement to give an allene-imine intermediate; subsequent cyclization affords the cyclobutene core. The kinetics of the transformation of starting material and the intermediate was studied by 1H NMR spectroscopy

  报道了一种容易的合成路线，该路线可从3-氮杂-1,5-烯炔中获得带有外环双键的多氟烷基官能化的环丁烯。反应通过热氮杂-克莱森重排进行，得到烯丙基-亚胺中间体；随后环化得到环丁烯核。通过1 H NMR光谱研究了起始原料和中间体的转化动力学，其中揭示了连续的反应。
• A facile synthesis of fluoroalkylpyrazoles
  作者：Jianhua Zheng、Zhibai Wang、Yanchang Shen

  DOI：10.1016/s0022-1139(00)80412-1

  日期：1993.3

  Fluorinated pyrazoles have been conveniently synthesized via 1,3-dipolar cycloaddition of ethyl diazoacetate with fluorine-containing acetylenes of the type R(F)C = CR, where R(F) = polyfluoroalkyl and R = CN or CO2CH3.