KR101460071B1 - Prepartion method for trifluoromethyl substituted heterocycles via visible light photoredox catalysis - Google Patents
Prepartion method for trifluoromethyl substituted heterocycles via visible light photoredox catalysis Download PDFInfo
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Abstract
본 발명은 루테늄 광촉매의 존재하에서 헤테로사이클 및 트리플루오로메틸 요오드 혼합물을 가시광선에 의해 반응시켜 헤테로사이클의 탄소-수소 결합을 트리플루오로메틸로 치환하는 트리플루오로메틸-치환된 헤테로사이클의 제조방법에 관한 것으로, 트리플루오로메틸 그룹을 화합물에 도입할 경우 그 화합물의 대사 안정성, 지질 용해도, 생물학적 이용가능성, 결합 선택성 등의 활성이 변화할 수 있으므로, 트리플루오로메틸-치환된 헤테로사이클을 포함하는 의약 및 농약의 제조 또는 유기합성 분야에 널리 활용될 수 있다.The present invention relates to the preparation of trifluoromethyl-substituted heterocycles in which a heterocycle and a trifluoromethyl iodide mixture are reacted by visible light in the presence of a ruthenium photocatalyst to replace the carbon-hydrogen bond of the heterocycle with trifluoromethyl The introduction of a trifluoromethyl group into a compound may change the activity of the compound such as metabolic stability, lipid solubility, bioavailability, binding selectivity, and the like, so that a trifluoromethyl-substituted heterocycle And can be widely used in the field of organic synthesis or in the manufacture of medicines and pesticides.
Description
본 발명은 가시광선 및 광촉매를 이용한 트리플루오로메틸-치환된 헤테로사이클의 제조방법에 관한 것으로, 특히 트리플루오로메틸-치환된 헤테로사이클을 유효성분으로 하는 의약 또는 농약의 제조 방법에 관한 것이다.
The present invention relates to a process for producing trifluoromethyl-substituted heterocycle using visible light and a photocatalyst, and more particularly to a process for producing a medicament or an agricultural chemical containing trifluoromethyl-substituted heterocycle as an active ingredient.
크기가 작으면서 전기음성도가 큰 트리플루오로메틸 그룹은 헤테로사이클 화합물의 물리적 및 화학적 특성, 예를 들어 결합 선택성, 지질 친화성, 생물학적 이용가능성 및 대사 안정성 등을 매우 크게 변화시키기 때문에, 의약, 농약, 염료 및 중합체 제조 분야에 응용을 위해 널리 이용되고 있다. Because the trifluoromethyl group, which is small in size and high in electronegativity, greatly changes the physical and chemical properties of the heterocyclic compound, such as binding selectivity, lipid affinity, bioavailability and metabolic stability, Pesticides, dyes, and polymers.
화합물 내에 트리플루오로메틸 그룹을 도입하기 위해 친핵성, 친전자성 또는 프리라디칼 시약을 이용한 방법들이 이용되어 왔고, 특히 전이금속을 매개로한 커플링 공정이 트리플루오로메틸 그룹의 도입에 획기적인 발전을 가져왔다. 구리 또는 팔라듐과 같은 전이금속을 이용한 공정에서는 다양한 방향족 환 또는 헤테로방향족환에 적용될 수 있지만, 트리플루오로메틸 그룹을 치환하려는 위치에 먼저 관능기를 치환해야 하므로, 여러 단계의 공정을 거쳐야 하는 문제가 있었다(PNAS, 2011, vol 108, 35).
Methods employing nucleophilic, electrophilic, or free radical reagents have been used to introduce trifluoromethyl groups into the compounds, and in particular, transition metal-mediated coupling processes have led to breakthroughs in the introduction of trifluoromethyl groups . In the process using a transition metal such as copper or palladium, it can be applied to various aromatic rings or heteroaromatic rings. However, since a functional group must first be substituted at a position where a trifluoromethyl group is to be substituted, (PNAS, 2011, vol 108, 35).
본 발명은 광촉매의 존재하에서 가시광선에 의해 헤테로사이클의 트리플루오로메틸레이션하는 방법을 제공하기 위한 것이다.
The present invention provides a process for the trifluoromethylation of a heterocycle by visible light in the presence of a photocatalyst.
본 발명은 루테늄 광촉매의 존재하에서 헤테로사이클 및 트리플루오로메틸 요오드 혼합물을 가시광선에 의해 반응시켜 헤테로사이클의 탄소-수소 결합을 트리플루오로메틸로 치환하는 트리플루오로메틸-치환된 헤테로사이클의 제조방법을 제공한다.The present invention relates to the preparation of trifluoromethyl-substituted heterocycles in which a heterocycle and a trifluoromethyl iodide mixture are reacted by visible light in the presence of a ruthenium photocatalyst to replace the carbon-hydrogen bond of the heterocycle with trifluoromethyl ≪ / RTI >
본 발명은 트리플루오로메틸의 공급원으로 트리플루오로메틸 요오드를 이용한다. 트리플루오로메틸 요오드는 헤테로사이클과 방향족환이 함께 존재하는 화합물에서 헤테로사이클에만 선택적으로 반응성을 나타낼 수 있다. 예를 들어, 트리플루오로메틸의 공급원으로 트리플루오로메틸 설포닐클로라이드(CF3SO2Cl)를 사용할 경우, 높은 반응성으로 인하여 헤테로사이클 뿐만아니라 방향족환이나 아민 작용기와 같은 친핵체(nucleophile)에도 반응이 이루어지므로, 헤테로사이클에 대한 선택적 반응성을 나타낼 수 없다. 트리플루오로메틸 요오드는 0.1 내지 10 mmol 농도또는 3 내지 4 당량을 사용한다.The present invention utilizes trifluoromethyl iodide as a source of trifluoromethyl. Trifluoromethyl iodide may selectively react only with the heterocycle in compounds where the heterocycle and the aromatic ring are present together. For example, when trifluoromethylsulfonyl chloride (CF 3 SO 2 Cl) is used as the source of trifluoromethyl, the high reactivity causes not only a heterocycle but also a nucleophile such as an aromatic ring or an amine functional group , It can not exhibit selective reactivity to the heterocycle. Trifluoromethyl iodide is used in a concentration of 0.1 to 10 mmol or 3 to 4 equivalents.
본 발명의 트리플루오로메틸-치환된 헤테로사이클의 제조방법에서, 상기 헤테로사이클 및 트리플루오로메틸 요오드 혼합물은 디메틸포름아미드, 아세토니트릴, 디클로로메탄, 디옥산, 에탄올 및 니트로메탄 중에서 선택되는 어느 하나 이상의 용매에 용해시킨 혼합용액일 수 있다. 상기 용매의 농도는 0.01 내지 1 M이 바람직하고, 또한 바람직하게는 용매 중에서 아세토니트릴을 이용한다.In the process for the preparation of the trifluoromethyl-substituted heterocycle of the present invention, the heterocycle and the trifluoromethyl iodide mixture are selected from the group consisting of dimethylformamide, acetonitrile, dichloromethane, dioxane, ethanol and nitromethane Or a mixture thereof. The concentration of the solvent is preferably 0.01 to 1 M, and more preferably, acetonitrile is used in a solvent.
본 발명의 트리플루오로메틸-치환된 헤테로사이클의 제조방법에서, 상기 헤테로사이클 및 트리플루오로메틸 요오드의 혼합용액에 N,N-디이소프로필에틸아민, 4-메톡시트리페닐아민, 트리에틸아민, 루티딘 및 테트라메틸렌디아민 중에서 선택되는 어느 하나 이상의 염기를 더 첨가할 수 있다. 상기 염기의 농도는 2 내지 3 당량이 바람직하고, 또한 바람직하게는 전자 주개로서 효과가 뛰어난 테트라메틸렌디아민을 염기로 이용한다.In the process for producing the trifluoromethyl-substituted heterocycle of the present invention, the above-mentioned heterocycle and trifluoromethyl iodide are mixed with a solution of N, N-diisopropylethylamine, 4-methoxytriphenylamine, triethyl Amine, lutidine, and tetramethylenediamine can be further added. The concentration of the base is preferably 2 to 3 equivalents, and more preferably, tetramethylenediamine having excellent effect as an electron donor is used as a base.
본 발명의 트리플루오로메틸-치환된 헤테로사이클의 제조방법에서, 상기 반응은 상온 및 상압에서 이루어진다.In the process for preparing the trifluoromethyl-substituted heterocycle of the present invention, the reaction is carried out at normal temperature and pressure.
본 발명의 트리플루오로메틸-치환된 헤테로사이클의 제조방법에서, 상기 루테늄 광촉매는 0.1 내지 10 mmol로 사용하고, 특별히 한정할 필요는 없으나 트리스(2,2'-비피리딜)루테늄 2가 양이온의 금속착체, 예를 들어 Ru(bpy)3Cl2 또는 Ru(bpy)3(PF6)2를 사용할 수 있다.In the process for producing the trifluoromethyl-substituted heterocycle of the present invention, the ruthenium photocatalyst is used in an amount of 0.1 to 10 mmol, and is not particularly limited, but tris (2,2'-bipyridyl) ruthenium divalent cation For example, Ru (bpy) 3 Cl 2 or Ru (bpy) 3 (PF 6 ) 2 can be used.
본 발명의 트리플루오로메틸-치환된 헤테로사이클의 제조방법에서, 상기 헤테로사이클은 질소, 산소 및 황 중에서 선택된 어느 하나 이상의 원소와 탄소로 이루어진 5-원 헤테로사이클 또는 6-원 헤테로사이클이고, 예를 들어 피롤, 퓨란, 씨오펜, 피리딘, 피란 또는 씨오피란일 수 있다. 또한 상기 헤테로사이클은 5-원 헤테로사이클 또는 6-원 헤테로사이클에 아릴기가 축합된 것으로, 예를 들어 인돌, 이소인돌, 아제핀, 벤즈아제핀, 카르바졸, 아크리딘 또는 디벤조아제핀일 수 있다. 또한 상기 헤테로사이클은 비치환된 것뿐 아니라 치환된 것을 포함한다. 상기 헤테로사이클은 0.05 내지 5 mmol 농도로 사용한다.
In the process for producing the trifluoromethyl-substituted heterocycle of the present invention, said heterocycle is a 5-membered heterocycle or a 6-membered heterocycle consisting of carbon and at least one element selected from nitrogen, oxygen and sulfur, For example, pyrrole, furan, cyanophene, pyridine, pyran or cefopyran. The heterocycle may also be a condensed aryl group in a 5-membered heterocycle or a 6-membered heterocycle, such as indole, isoindole, azepine, benzazepine, carbazole, acridine or dibenzoazepinyl have. The heterocycle includes unsubstituted as well as substituted ones. The heterocycle is used in a concentration of 0.05 to 5 mmol.
트리플루오로메틸 그룹을 화합물에 도입할 경우 그 화합물의 대사 안정성, 지질 친화성, 생물학적 이용가능성, 결합 선택성 등의 활성이 변화할 수 있으므로, 본 발명의 상온 및 상압 조건에서 가시광선을 이용하여 트리플루오로메틸 그룹을 화합물에 도입하는 방법은 의약 및 농약의 제조 또는 유기합성 분야에 널리 활용될 수 있다.
When the trifluoromethyl group is introduced into the compound, the activity of the compound such as metabolic stability, lipid affinity, bioavailability and binding selectivity may be changed. Therefore, in the present invention, The method of introducing a fluoromethyl group into a compound can be widely used in the fields of the production of medicines and agricultural chemicals or in the field of organic synthesis.
도 1은 트리플루오로메틸 그룹을 포함하는 의약이나 농약의 구조식을 나타낸 것으로, 구조식 아래에는 의약 또는 농약의 명칭, 용도 및 제조사를 순서대로 나타낸다.
도 2는 실험예 1의 3-메틸인돌의 트리플루오로메틸레이션 반응식과 개략적인 조건을 나타낸 것이다.
도 3은 본 발명의 헤테로사이클의 트리플루오로메틸레이션 반응의 메카니즘을 나타낸 것이다.
도 4는 실험예 2의 3-메틸인돌의 트리플루오로메틸레이션 반응식과 개략적인 조건을 나타낸 것이다.
도 5는 실험예 3의 3-메틸인돌의 트리플루오로메틸레이션 반응식과 개략적인 조건을 나타낸 것이다.
도 6은 실험예 3의 반응물질 및 반응생성물의 화학식 및 수율을 나타낸 것이다. Fig. 1 shows a structural formula of a medicament or an agricultural chemical containing a trifluoromethyl group. In the following, the names of medicines or pesticides, the uses and the manufacturers are shown in order.
2 shows the trifluoromethylation reaction formula of 3-methylindole of Experimental Example 1 and the schematic conditions.
Figure 3 shows the mechanism of the trifluoromethylation reaction of the heterocycle of the present invention.
4 shows the trifluoromethylation reaction formula of 3-methylindole in Experimental Example 2 and the schematic conditions.
5 shows the trifluoromethylation reaction formula of 3-methylindole in Experimental Example 3 and the schematic conditions.
6 shows the formulas and yields of the reaction materials and the reaction products of Experimental Example 3.
이하, 실시예를 통하여 본 발명을 더욱 상세히 설명한다. 이들 실시예는 본 발명을 보다 구체적으로 설명하기 위한 것으로, 본 발명의 범위가 이들 실시예에 의해 제한되는 것은 아니다.
Hereinafter, the present invention will be described in more detail by way of examples. These examples are for further illustrating the present invention, and the scope of the present invention is not limited by these examples.
실험예 1: 광촉매의 종류에 따른 3-메틸인돌의 트리플루오로메틸레이션 확인Experimental Example 1: Determination of trifluoromethylation of 3-methylindole according to the type of photocatalyst
3-메틸인돌의 트리플루오로메틸레이션을 광촉매의 종류, 가시광선의 존재여부를 달리하여 실험하였다. 도 2에는 실험예 1의 3-메틸인돌의 트리플루오로메틸레이션 반응식과 개략적인 조건을 나타내었다. 또한 이하에서는 반응물질인 헤테로사이클 1, 트리플루오로메틸-치환된 헤테로사이클은 2로 함께 표시하고, 각각의 헤테로사이클의 종류에 따라 영문 알파벳 소문자를 부여하여 구별하였다.Trifluoromethylation of 3-methylindole was experimented with different kinds of photocatalyst and presence of visible light. FIG. 2 shows the trifluoromethylation reaction formula of 3-methylindole of Experimental Example 1 and schematic conditions. Hereinafter, the
광촉매로는 표 1에 나타낸 것과 같이 이리듐 광촉매와 루테늄 광촉매를 각각 2 종씩 1 몰%로 사용하였고, 3-메틸인돌(1a)는 0.3 mmol, 트리플루오로메틸 요오드 0.9 내지 1.2 mmol, 전자주개로 작용하는 염기는 N,N-디이소프로필에틸아민(이하 'DIPEA'라고도 함)을 0.6 mmol, 용매인 디메틸포름아미드(이하 'DMF'라고도 함) 1.2 mL 사용하여 24 W 백열전구를 이용해 실온에서 24시간 반응시켰다. 반응 후 생성된 트리플루오로메틸-치환된 2-메틸인돌(2a)의 수율은 내부 표준으로 도데칸을 사용한 가스 크로마토그래피로 측정하였다.As the photocatalyst, 1 mol% of iridium photocatalyst and 2 wt% of ruthenium photocatalyst were used as the photocatalyst, 0.3 mmol of 3-methylindole (1a), 0.9 to 1.2 mmol of trifluoromethyl iodide, The reaction was carried out in a 24 W incandescent bulb using 0.6 mmol of N, N-diisopropylethylamine (hereinafter also referred to as 'DIPEA') and 1.2 mL of dimethylformamide (hereinafter also referred to as 'DMF' Lt; / RTI > The yield of the trifluoromethyl-substituted 2-methylindole (2a) produced after the reaction was determined by gas chromatography using dodecane as an internal standard.
알데히드의 a-트리플루오로메틸레이션에서 이리듐 광촉매의 반응성이 뛰어났지만, 헤테로사이클의 트리플루오로메틸레이션에서는 루테늄 광촉매의 반응성이 뛰어남을 알 수 있었고, 가시광선을 제거하거나 광촉매를 제거할 경우 트리플루오로메틸레이션이 일어나지 않음을 확인하였다.The reactivity of the iridium photocatalyst was excellent in the a-trifluoromethylation of the aldehyde, but the reactivity of the ruthenium photocatalyst was excellent in the heterocyclic trifluoromethylation. When the visible light was removed or the photocatalyst was removed, It was confirmed that no rometylation occurred.
상기 결과로부터 본 발명의 헤테로사이클의 트리플루오로메틸레이션 반응의 메카니즘은 도 3과 같을 것으로 추정되었다.
From the above results, the mechanism of the trifluoromethylation reaction of the heterocycle of the present invention was presumed to be as shown in Fig.
실험예 2: 염기 및 용매의 종류에 따른 3-메틸인돌의 트리플루오로메틸레이션 확인Experimental Example 2: Determination of trifluoromethylation of 3-methylindole according to kinds of base and solvent
실험예 1의 결과로부터 광촉매로 수율이 높은 Ru(bpy)3Cl2을 선택하고, 3-메틸인돌의 트리플루오로메틸레이션을 염기 및 용매의 종류를 달리하고, 용매의 농도는 0.25 M로 고정한 후, 나머지 조건은 실험예 1과 동일하게 실험을 진행하여 그 결과를 표 2에 나타내었다. 도 4에는 실험예 2의 3-메틸인돌의 트리플루오로메틸레이션 반응식과 개략적인 조건을 나타내었다. From the results of Experimental Example 1, it was confirmed that Ru (bpy) 3 Cl 2 having a high yield by photocatalyst was selected, and the trifluoromethylation of 3-methylindole was changed in different kinds of bases and solvents and the concentration of the solvent was fixed at 0.25 M The remaining conditions were the same as in Experimental Example 1, and the results are shown in Table 2. FIG. 4 shows the trifluoromethylation reaction formula of 3-methylindole in Experimental Example 2 and the schematic conditions.
상기 결과 용매로는 아세토니트릴(CH3CN)이 가장 적합하였고, 특히 염기를 테트라메틸렌디아민(TMEDA)를 사용했을 때 수율이 가장 높은 것을 확인할 수 있었다. 결과를 첨부하지는 않았으나 2-8보다 염기 농도를 높여 3 내지 5 당량을 넣는 경우에도 수율에는 큰 변화가 없었으나, 2-9에 나타낸 것과 같이 염기의 농도를 1 당량을 낮출 경우 수율이 현저히 감소하는 것을 확인할 수 있었다. As a result, acetonitrile (CH 3 CN) was the most suitable solvent. In particular, when the base was tetramethylenediamine (TMEDA), the yield was the highest. Although the results were not attached, the yields were not significantly changed even when 3-5 equivalents were added at higher base concentrations than 2-8. However, as shown in 2-9, when the equivalents of the bases were lowered by 1 equivalent, the yield was significantly reduced .
또한 별도 데이터를 첨부하지는 않았으나 백열등에 비해 청색 LED를 가시광선의 광원으로 사용했을 때 더 높은 효율을 나타내었다. 또한 상기 반응에는 트리플루오로메틸 요오드가 최소한 3 내지 4 당량 이상 사용되어야 재현성 있는 실험결과를 나타내었다.
In addition, the efficiency was higher when the blue LED was used as the light source of the visible light than the incandescent lamp although the data was not attached. Also, at least 3 to 4 equivalents or more of trifluoromethyl iodide should be used in the reaction to give reproducible experimental results.
실험예Experimental Example 3: 3: 헤테로사이클Heterocycles 종류에 따른 Depending on the type 트리플루오로메틸레이션Trifluoromethylation 확인 Confirm
실험예 1의 결과로부터 광촉매로 수율이 높은 Ru(bpy)3Cl2을 선택하고, 실험예 2의 결과로부터 테트라메틸렌디아민(TMEDA) 2 당량, 아세토니트릴(CH3CN) 0.25 M를 선택한 후 다양한 구조의 헤테로사이클의 트리플루오로메틸레이션을 확인하였다. 반응물질로 사용한 헤테로사이클은 1a부터 1e까지는 인돌, 1f부터 1h까지는 피롤, 1i은 씨오펜, 그리고 1j는 퓨란이었다. 도 5는 실험예 3의 트리플루오로메틸레이션 반응식과 개략적인 조건을 나타내었다. From the results of Experimental Example 1, Ru (bpy) 3 Cl 2 having a high yield by photocatalyst was selected, and 2 equivalents of tetramethylenediamine (TMEDA) and 0.25 M of acetonitrile (CH 3 CN) were selected from the results of Experimental Example 2, The trifluoromethylation of the heterocycle of the structure was confirmed. Heterocycles used as reactants were indole from 1a to 1e, pyrrole from 1f to 1h, cyanophene for 1i, and furan for 1j. FIG. 5 shows the trifluoromethylation reaction scheme and experimental conditions of Experimental Example 3. FIG.
루테늄 광촉매 Ru(bpy)3Cl2 1 몰%로 사용하였고, 반응물질(1)들은 0.3 또는 1 mmol, 트리플루오로메틸 요오드 3 내지 4 당량, TMEDA는 2 당량, 아세토니트릴은 0.25 M을 사용하여 24 W 백열전구를 이용해 실온에서 24시간 반응시켰다. 반응 후 생성된 트리플루오로메틸-치환된 2-메틸인돌(2a)의 수율은 내부 표준으로 도데칸을 사용한 가스 크로마토그래피로 측정하였다.Ruthenium photocatalyst Ru (bpy) 3 Cl 2 was used in an amount of 1 mol%, 0.3 or 1 mmol of the reactants (1), 3 to 4 equivalents of trifluoromethyl iodide, 2 equivalents of TMEDA and 0.25 M of acetonitrile 24 W incandescent lamp for 24 hours at room temperature. The yield of the trifluoromethyl-substituted 2-methylindole (2a) produced after the reaction was determined by gas chromatography using dodecane as an internal standard.
각각의 헤테로사이클의 종류에 따른 수율은 도 6에 나타내었다. 도 6의 2)로 표시한 화합물의 수율은 내부표준으로 4-플루오로톨루엔을 이용한 19F NMR분광법으로 측정하였고, 나머지는 내부 표준으로 도데칸을 사용한 가스 크로마토그래피로 측정하였다.The yield according to the type of each heterocycle is shown in Fig. The yield of the compound represented by 2) in FIG. 6 was measured by 19 F NMR spectroscopy using 4-fluorotoluene as an internal standard, and the remainder was measured by gas chromatography using dodecane as an internal standard.
도 6에서 1)로 표시한 1b의 인돌 화합물에서는 2b 뿐만 아니라 6원환에 트리플루오로메틸 그룹이 치환된 레기오아이소머가 5% 정도 생성되었다. 그러나 나머지 1a, 1c 내지 1e의 인돌 화합물에서는 방향족 환에는 치환이 이루어지지 않고, 피롤환에만 치환이 되었다. 이러한 트리플루오로메틸레이션은 실험예 3에서 이용한 벤조피롤에서 뿐만 아니라 벤조씨아졸 및 벤조퓨란에서도 확인되었으나, 벤조피롤보다는 수율이 낮았다. 또한 전자가 결핍된 헤테로사이클이나 방향족환에서는 반응성을 거의 나타내지 않았다. 다만 1e의 브롬기, 1g의 알데히드기, 1c, 1h 및 1i의 에스테르기 및 1i의 아민기가 포함된 헤테로사이클에서도 뛰어난 반응성을 나타내었다.In the
또한 1d 및 1e의 반응 생성물에서도 레기오아이소머가 생성되었다. 또한 트리플루오로메틸 요오드를 5 당량 첨가한 경우 1f의 N-메틸피롤에서 2f의 2-트리플루오로메틸-치환된 N-메틸피롤 이외에 2번 및 5번 위치에 트리플루오로메틸이 모두 치환된 반응 생성물이 10% 정도 함께 생성되었다.Regio isomers were also produced in the reaction products of 1d and 1e. Further, when 5 equivalents of trifluoromethyl iodine was added, in addition to 2f of 2-trifluoromethyl-substituted N-methylpyrrole in 1f of N-methylpyrrole, all of trifluoromethyl was substituted at
Claims (12)
상기 단계에서 용해된 혼합 용액을 트리스(2,2'-비피리딜)루테늄 2가 양이온의 금속착체인 루테늄 광촉매의 존재하에서 가시광선에 의해 반응시키는 단계;를 포함하고,
상기 피롤 환에 벤젠 환이 축합된 인돌 화합물의 피롤 환에 트리플루오로메틸이 선택적으로 치환된 트리플루오로메틸-치환된 인돌 화합물의 제조방법.
Dissolving an indole compound in which a benzene ring is condensed in a pyrrole ring and acetonitrile in which trifluoromethyl iodine is added with 2 to 3 equivalents of at least one base selected from triethylamine or tetramethylenediamine; And
Reacting the mixed solution dissolved in the above step by visible light in the presence of a ruthenium photocatalyst which is a metal complex of tris (2,2'-bipyridyl) ruthenium divalent cation,
Substituted indole compound in which trifluoromethyl is optionally substituted on the pyrrole ring of the indole compound in which the benzene ring is condensed to the pyrrole ring.
The process for producing a trifluoromethyl-substituted indole compound according to claim 1, wherein the reaction is carried out at normal temperature and pressure.
2. The method according to claim 1, wherein the concentration of the benzene ring-condensed indole compound in the pyrrole ring is 0.05 to 5 mmol, the concentration of the trifluoromethyl iodine is 0.1 to 10 mmol, the concentration of the ruthenium photocatalyst is 0.1 to 10 mmol, Wherein the concentration of acetonitrile is from 0.01 to 1 M. 5. A process for the preparation of a trifluoromethyl-substituted indole compound according to claim 1,
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