CN114351174A - Preparation method of benzyl thiocyanate compound - Google Patents

Preparation method of benzyl thiocyanate compound Download PDF

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CN114351174A
CN114351174A CN202210111065.8A CN202210111065A CN114351174A CN 114351174 A CN114351174 A CN 114351174A CN 202210111065 A CN202210111065 A CN 202210111065A CN 114351174 A CN114351174 A CN 114351174A
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preparation
nmr
benzyl thiocyanate
thiocyanate compound
cdcl
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郭维斯
张善学
文丽荣
李明
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Qingdao University of Science and Technology
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Abstract

The invention discloses a preparation method of a benzyl thiocyanate compound, belonging to the technical field of organic synthesis. The method comprises the following steps: adding substituted ethylbenzene, trimethylsilyl isothiocyanate, electrolyte and solvent into a reactor, reacting under the action of constant current, and separating by silica gel column chromatography to obtain pure target product after the reaction is finished. The preparation method of the benzyl thiocyanate compound provided by the invention has the characteristics of scientificity, reasonableness, mild conditions, simplicity in operation and the like. The reaction equation is as follows:

Description

Preparation method of benzyl thiocyanate compound
Technical Field
The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of a benzyl thiocyanate compound.
Background
Thiocyanide compounds are widely present in natural products and drug Molecules (eur.j.med.chem.,2016,118,21) and are also important intermediates for the synthesis of thiocarbamates, thiotetrazoles and other sulfur-containing derivatives (Molecules,2018,23, 2727). Researches show that the compounds have various biological activities such as sterilization, anticancer and the like, and have important application values in the fields of medicines, pesticides and the like. Therefore, the development of a new green and efficient method for synthesizing the thiocyanate compounds is of great significance.
The preparation method of the benzyl thiocyanate compound comprises the following steps:
1) halogenated alkane and potassium thiocyanate are used as raw materials
Varma et al prepared benzyl thiocyanate (J.org.chem.2006,71,6697) from haloalkane and potassium thiocyanate at microwave temperature of 110 deg.C.
2) Uses mercaptan and triphenylphosphine thiocyanate as raw materials
Iranpor et al prepared benzyl thiocyanate compounds from mercaptan and triphenylphosphine thiocyanate, the latter being generated in situ from triphenylphosphine, bromine and ammonium thiocyanate at room temperature (Tetrahedron Lett.2002,43,3439).
The benzyl thiocyanate compound synthesized by the method has obvious defects and shortcomings: 1) the starting material needs to be pre-functionalized; 2) the use of toxic reagents; 3) the reaction conditions were severe.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a benzylthiocyanate compound.
A method for preparing a benzyl thiocyanate compound, the benzyl thiocyanate compound having a structure represented by formula I:
Figure BDA0003489868470000021
in the formula I, wherein R1The substituent is fluorine, chlorine, bromine, methyl, ethyl, tertiary butyl, isopropyl, cyclohexyl, chloromethyl or cyano. Characterized in that the molar ratio of 1: 2, adding tetrabutylammonium perchlorate as electrolyte and dichloroethane as solvent into substituted ethylbenzene and trimethylsilyl isothiocyanate, and reacting at room temperature under the action of constant current, wherein the reaction equation is as shown in formula II:
Figure BDA0003489868470000022
the invention has the beneficial effects that: the invention establishes a new method for synthesizing the benzyl thiocyanate compounds, and the method has the characteristics of easily obtained raw materials, mild reaction conditions, wide substrate range and the like.
Drawings
FIG. 1 is an NMR spectrum of Compound 3a prepared in example 1;
FIG. 2 is an NMR spectrum of compound 3d prepared in example 7;
FIG. 3 is an NMR spectrum of compound 3i prepared in example 9.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
Preparation of benzyl thiocyanate Compound 3a
Figure BDA0003489868470000031
To a 10mL three-necked flask were added p-bromoethylbenzene 1a (0.3mmol,56mg), trimethylsilyl isothiocyanate 2(0.6mmol,79mg), tetrabutylammonium perchlorate (0.6mmol,205mg) and dichloroethane (6 mL). Graphite felt (1cm x 1.5cm x 1cm) is used as an anode, and a platinum sheet (1cm x 1cm x 0.1mm) is used as a cathode. The reaction mixture was stirred at room temperature for 6 hours at a constant current of 5 mA. After completion of the reaction, the solvent was removed by rotary evaporator. Product 3a was obtained by column chromatography on silica gel using petroleum ether and dichloromethane (2:1) as eluent in 81% yield.
Spectrogram analysis data 3a:
1H NMR(500MHz,CDCl3)δ7.52(d,J=8.4Hz,2H),7.26(d,J=8.4Hz,2H),4.55(q,J=7.0Hz,1H),1.85(d,J=7.0Hz,3H).
13C NMR(125MHz,CDCl3)δ138.3,132.3,128.8,123.1,111.4,47.8,21.8.
example 2
1a in example 1 is replaced by 1b, other conditions are the same as example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000032
Spectrogram analysis data 3b:
1H NMR(500MHz,CDCl3)δ7.30(d,J=7.9Hz,2H),7.22(d,J=7.9Hz,2H),4.61(q,J=7.0Hz,1H),2.55–2.46(m,1H),1.88(d,J=6.9Hz,3H),1.88–1.72(m,4H),1.47–1.36(m,4H),1.31–1.22(m,2H).
13C NMR(125MHz,CDCl3)δ149.1,136.3,127.6,127.1,112.1,48.6,44.3,34.4,26.9,26.2,22.2.
example 3
1a in example 1 is replaced by 1c, other conditions are the same as in example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000041
Spectrogram analysis data 3c:
1H NMR(500MHz,CDCl3)δ7.27(d,J=8.3Hz,2H),7.19(d,J=7.8Hz,2H),4.60(q,J=6.9Hz,1H),2.35(s,3H),1.86(d,J=7.0Hz,3H).
13C NMR(125MHz,CDCl3) Delta 139.0,136.1,129.8,127.1,112.0,48.6,22.1,21.3 example 4
1a in example 1 is replaced by 1d, other conditions are the same as in example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000042
Spectrogram analysis data 3d:
1H NMR(500MHz,CDCl3)δ7.40(d,J=8.4Hz,2H),7.31(d,J=8.4Hz,2H),4.61(q,J=7.0Hz,1H),1.88(d,J=6.9Hz,3H),1.32(s,9H).
13C NMR(125MHz,CDCl3)δ152.2,136.0,126.9,126.1,112.1,48.5,34.8,31.3,22.2.
example 5
1a in example 1 is replaced by 1e, other conditions are the same as in example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000051
Spectrogram analysis data 3e:
1H NMR(500MHz,CDCl3)δ7.37(dd,J=8.7,5.1Hz,2H),7.08(t,J=8.5Hz,2H),4.60(q,J=7.0Hz,1H),1.86(d,J=7.0Hz,3H).
13C NMR(125MHz,CDCl3)δ162.9(d,J=248.6Hz),135.1,129.0(d,J=8.3Hz),116.2(d,J=21.9Hz),111.6,47.8,22.1.
example 6
1f is used instead of 1a in example 1, the conditions are the same as in example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000052
Spectrogram analysis data 3f:
1H NMR(500MHz,CDCl3)δ7.37(d,J=8.6Hz,2H),7.33(d,J=8.6Hz,2H),4.57(q,J=7.0Hz,1H),1.85(d,J=7.0Hz,3H).
13C NMR(125MHz,CDCl3)δ137.8,135.0,129.4,128.5,111.4,47.8,21.9.
example 7
1a in example 1 was replaced by 1g, and the experimental results are shown in Table 1, except that the conditions were the same as in example 1.
Figure BDA0003489868470000053
3g of spectrogram analysis data:
1H NMR(500MHz,CDCl3)δ7.70(d,J=8.4Hz,2H),7.51(d,J=8.2Hz,2H),4.57(q,J=7.1Hz,1H),1.87(d,J=7.1Hz,3H).
13C NMR(125MHz,CDCl3) Delta 144.6,133.0,128.0,118.2,113.1,110.7,47.5,21.5 EXAMPLE 8
1a in example 1 is replaced by 1h, other conditions are the same as example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000061
Spectrogram analysis data 3h:
1H NMR(500MHz,CDCl3)δ7.42(d,J=8.1Hz,2H),7.38(d,J=8.3Hz,2H),4.62–4.59(m,1H),4.58(s,2H),1.87(d,J=7.0Hz,3H).
13C NMR(125MHz,CDCl3) Delta 139.4,138.3,129.3,127.6,111.6,48.1,45.6,22.0 example 9
1a in example 1 is replaced by 1i, other conditions are the same as example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000062
Spectrogram analysis data 3i:
1H NMR(500MHz,CDCl3)δ7.30(d,J=8.3Hz,2H),7.24(d,J=8.3Hz,2H),4.61(q,J=7.0Hz,1H),2.96–2.86(m,1H),1.88(d,J=7.0Hz,3H),1.25(d,J=6.9Hz,6H).
13C NMR(125MHz,CDCl3)δ150.0,136.4,127.3,127.2,112.1,48.6,34.0,23.9,22.2.
example 10
1j is used for replacing 1a in example 1, other conditions are the same as example 1, and the experimental results are shown in Table 1.
Figure BDA0003489868470000071
Spectrogram analysis data 3j:
1H NMR(500MHz,CDCl3)δ7.30(d,J=8.2Hz,2H),7.22(d,J=7.9Hz,2H),4.61(q,J=7.0Hz,1H),2.66(q,J=7.6Hz,2H),1.88(d,J=7.0Hz,3H),1.24(t,J=7.6Hz,3H).
13C NMR(125MHz,CDCl3)δ145.4,136.3,128.7,127.2,112.1,48.7,28.7,22.2,15.5.
TABLE 1
Figure BDA0003489868470000081

Claims (2)

1. A method for preparing a benzyl thiocyanate compound, the benzyl thiocyanate compound having a structure represented by formula I:
Figure FDA0003489868460000011
in the formula I, wherein R1The substituent is fluorine, chlorine, bromine, methyl, ethyl, tertiary butyl, isopropyl, cyclohexyl, chloromethyl or cyano. Characterized in that the molar ratio of 1: 2, adding tetrabutylammonium perchlorate as electrolyte and dichloroethane as solvent into substituted ethylbenzene and trimethylsilyl isothiocyanate, and reacting at room temperature under the action of constant current, wherein the reaction equation is as shown in formula II:
Figure FDA0003489868460000012
2. the method of claim 1, wherein: the electrode is graphite felt as an anode and a platinum sheet as a cathode, the reaction time is 6h, and the current intensity is constant current of 5 mA.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111235596A (en) * 2020-01-21 2020-06-05 青岛科技大学 Preparation method of thiazoline compound containing selenium
WO2020147861A1 (en) * 2019-01-17 2020-07-23 五邑大学 Electrochemical preparation method for β-trifluoromethylamide compound
CN113881956A (en) * 2021-10-11 2022-01-04 青岛科技大学 Preparation method of benzyl isocyanate compound

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020147861A1 (en) * 2019-01-17 2020-07-23 五邑大学 Electrochemical preparation method for β-trifluoromethylamide compound
CN111235596A (en) * 2020-01-21 2020-06-05 青岛科技大学 Preparation method of thiazoline compound containing selenium
CN113881956A (en) * 2021-10-11 2022-01-04 青岛科技大学 Preparation method of benzyl isocyanate compound

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
袁履冰: "《有机化学学习指南》", 辽宁科学技术出版社, pages: 196 *

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Application publication date: 20220415