WO2010044465A1 - 新規化合物およびそれを含む機能性発光プローブ - Google Patents
新規化合物およびそれを含む機能性発光プローブ Download PDFInfo
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- WO2010044465A1 WO2010044465A1 PCT/JP2009/067919 JP2009067919W WO2010044465A1 WO 2010044465 A1 WO2010044465 A1 WO 2010044465A1 JP 2009067919 W JP2009067919 W JP 2009067919W WO 2010044465 A1 WO2010044465 A1 WO 2010044465A1
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- XHZTZKAXCPJABO-UHFFFAOYSA-N Clc1nc2ccccc2c2ccccc12 Chemical compound Clc1nc2ccccc2c2ccccc12 XHZTZKAXCPJABO-UHFFFAOYSA-N 0.000 description 1
- RZFVLEJOHSLEFR-UHFFFAOYSA-N O=C1Nc2ccccc2-c2ccccc12 Chemical compound O=C1Nc2ccccc2-c2ccccc12 RZFVLEJOHSLEFR-UHFFFAOYSA-N 0.000 description 1
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B11/00—Diaryl- or thriarylmethane dyes
- C09B11/04—Diaryl- or thriarylmethane dyes derived from triarylmethanes, i.e. central C-atom is substituted by amino, cyano, alkyl
- C09B11/10—Amino derivatives of triarylmethanes
- C09B11/24—Phthaleins containing amino groups ; Phthalanes; Fluoranes; Phthalides; Rhodamine dyes; Phthaleins having heterocyclic aryl rings; Lactone or lactame forms of triarylmethane dyes
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- C09B57/00—Other synthetic dyes of known constitution
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- C09B57/02—Coumarine dyes
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- C09B57/00—Other synthetic dyes of known constitution
- C09B57/10—Metal complexes of organic compounds not being dyes in uncomplexed form
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/84—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving inorganic compounds or pH
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/18—Metal complexes
- C09K2211/185—Metal complexes of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
Definitions
- the present invention relates to a novel compound and a functional luminescent probe whose luminescent color changes depending on the oxygen concentration containing it.
- Non-Patent Documents 1 to 4 are known to emit phosphorescence, and are expected to be applied to organic EL displays and the like.
- an iridium complex discovered ((btp) 2 Ir (acac )) to emit the phosphorescent depending on the oxygen concentration, the iridium complex ((btp) 2 Ir (acac ))
- a method for measuring oxygen concentration in living tissue using phosphorescence (intensity, lifetime) was developed (Patent Document 1).
- Patent Document 1 In addition, from the measurement of phosphorescence intensity and lifetime of (btp) 2 Ir (acac), we succeeded in quantifying the oxygen concentration in the liposome membrane, visualizing the oxygen concentration in cancer cells, and visualizing the tumor in tumor-bearing mice ( Patent Document 1). Furthermore, a compound that emits phosphorescence in the near infrared region depending on the oxygen concentration was also developed (Patent Document 2). Furthermore, a phosphorescent compound having water solubility was also developed (Patent Document 3).
- the luminescent probe method using the iridium complex as described above is very effective as a method for noninvasively and highly sensitively measuring the oxygen concentration of a specific part of a micro structure such as a cell.
- an oxygen concentration measurement method using a luminescent probe utilizes the fact that the luminescence of the probe molecule is quenched by collision with the oxygen molecule, that is, the luminescence intensity of the luminescent probe changes depending on the oxygen concentration.
- the method of obtaining the oxygen concentration from the change in emission intensity gives an accurate value when the concentration of the probe molecule and the excitation light intensity distribution are uniform, but the concentration distribution of the probe molecule as in the measurement of intracellular oxygen concentration.
- An object of the present invention is to provide an oxygen-responsive luminescent probe capable of easily measuring the oxygen concentration without being affected by the probe concentration.
- the present inventor has intensively studied to solve the above problems. As a result, the inventors succeeded in synthesizing a novel compound comprising a linker, an oxygen concentration-responsive phosphorophore bonded to the first end of the linker, and a fluorophore bonded to the second end of the linker, It has been found that the emission color changes depending on the oxygen concentration without being influenced by the concentration of the compound itself, and the present invention has been completed.
- the present invention is as follows.
- a compound comprising a linker, an oxygen concentration-responsive phosphorescent group bonded to the first end of the linker, and a fluorescent group bonded to the second end of the linker.
- the compound according to [1] or [2], wherein the oxygen concentration-responsive phosphorescent group is a group containing an iridium complex.
- the compound according to [3], wherein the iridium complex has a structure represented by the following general formula (I).
- the figure which shows the preferable energy relationship in the excited state relaxation process of a fluorescence group and a phosphorescence group in an oxygen-responsive light emission probe The figure which shows the energy relationship in the excited state relaxation process of C343-Chol-BTP.
- an oxygen concentration-responsive phosphorophore and an oxygen-insensitive fluorophore are bonded and linked to the first and second ends of the linker, respectively.
- the triplet level of the phosphor group is lower than the triplet level of the phosphor group, energy transfer occurs from the phosphor group to the phosphor group, and the phosphorescence intensity may be significantly reduced.
- the excited triplet (T 1 ) level of the fluorophore is the excited triplet (T 1 ') of the phosphor group. It is preferable to combine the luminophores so as to be higher than the level.
- the phosphorescent group is not particularly limited as long as it is a group that emits phosphorescence depending on the oxygen concentration, but is preferably a group containing an iridium complex.
- the iridium complex means a metal complex having Ir (III) as a central metal and an aromatic molecule as a ligand, and examples thereof include those disclosed in the following documents 1) to 4). .
- the aromatic molecule of the ligand is not particularly limited as long as the iridium complex containing the ligand emits phosphorescence, but an aromatic system containing a hetero atom such as a nitrogen atom, an oxygen atom or a sulfur atom.
- a ligand is preferred. 1) S. Lamansky, P. Djurovich, D. Murphy, F.
- m, n, and z are integers from 0 to 3.
- X and Y represent hydrogen or a substituent selected from an alkyl group, an alkoxy group, an amino group, a dimethylamino group, a trifluoromethyl group, a cyano group, an acetyl group, a carboxyl group, an alkyl ester group, and an alkylamide group. .
- Particularly preferred iridium complexes include the following.
- the excited triplet (T 1 ') levels of these phosphorescent groups are 198, 182, 172, and 170 kJ / mol, respectively.
- the fluorophore can be selected as appropriate according to the above-mentioned phosphorophore, and NBD (4-Nitrobenzo-2-oxa-1,3-diazole), FITC, or coumarin dyes, rhodamines, BODIPY, cyanine dyes
- NBD Nitrobenzo-2-oxa-1,3-diazole
- FITC coumarin dyes
- BODIPY cyanine dyes
- the following NBD, FITC, or C343 is preferable.
- the excited triplet (T 1 ) levels of these fluorophores are 181, 197 and 206 kJ / mol, respectively.
- the linker that connects the fluorophore and the phosphorescent group is not particularly limited as long as it chemically bonds the two, but in order to avoid the proximity of the fluorophore and the phosphorescent group, the phosphorescent group and the phosphorescent group are connected. It is desirable that the linker to be connected is as rigid as possible. Further, the length is preferably 20 mm or more. The upper limit of the length is not particularly limited, but is preferably 30 mm or less. The molecular weight of the linker moiety is preferably 4,000 or less. Steroids and polypeptides can be suitably used as linkers because they can be bound to luminophores relatively easily.
- the luminescent probe can be made water-soluble.
- the polypeptide is preferably a polypeptide having 4 to 20 amino acid residues, for example, polyproline.
- a linker containing the following cholesterol skeleton can also be used as a linker.
- One or more of the carbon-carbon bonds in each ring may be a double bond.
- the compounds of the present invention are not limited to the following compounds as long as they exhibit color development depending on the oxygen concentration.
- the compound (9) satisfies the energy relationship of FIG.
- Compounds (10) and (11) also satisfy the energy relationship of FIG.
- the compound (13) also satisfies the energy relationship of FIG.
- the compound (12) does not satisfy the energy relationship of FIG. 1, but even in that case, if the luminophore is bonded through a rigid and long linker, the energy transfer is suppressed, and fluorescence and phosphorescence are suppressed. Both can be taken out.
- the compound of the present invention can be obtained by reacting a phosphorophore compound and a fluorophore compound with a linker compound having a reactive group at both ends.
- the compound (9) can be synthesized according to the method described in Examples described later. It should be noted that the following C343-Chol-BTQ, C343-Chol-BTIQ, and C343-Chol-BTPH can be obtained by using BTQ, BTIQ, and BTPH instead of BTP in compound (9).
- the luminescent color of the compound of the present invention changes depending on the oxygen concentration, it can be used as an oxygen-responsive luminescent probe for measuring the oxygen concentration based on the color development. For example, in the case of the compound (9), it can be determined that the oxygen concentration is low when it is purple, and the oxygen concentration is high when it is blue (FIG. 4).
- the oxygen-responsive luminescent probe of the present invention When using the oxygen-responsive luminescent probe of the present invention to detect the oxygen concentration in a sample, the oxygen-responsive luminescent probe of the present invention is added to the sample and incubated, and then the probe is excited so that phosphorescence can be observed. Phosphorescence can be observed using a simple fluorescence microscope, fluorescence measurement device, fluorescence imaging device, or the like.
- Example 1 Emission spectrum of C343-Chol-BTP As shown in FIG. 3, the emission spectrum of C343-Chol-BTP consists of C343 fluorescence and BTP phosphorescence. Under argon (Ar) substitution in the absence of oxygen, both fluorescence and phosphorescence are observed, and when aerated, phosphorescence is quenched and only fluorescence is observed. The oxygen concentration can be determined from the ratio of fluorescence intensity and phosphorescence intensity.
- FIG. 4 shows an emission image of C343-Chol-BTP (concentration: 10.7 ⁇ M) in acetonitrile under air saturation conditions or Ar substitution conditions. As a result, C343-Chol-BTP was found to be blue under air saturation conditions and purple under Ar substitution conditions.
- FIG. 5 shows an emission spectrum of C343-Chol-BTP (concentration: 5.7 ⁇ M) in acetonitrile measured by changing the dissolved oxygen partial pressure. It can be seen that only phosphorescence is extinguished as the oxygen partial pressure increases.
- FIG. 6 shows the results of plotting the ratio of the fluorescence intensity monitored at 479 nm and the phosphorescence intensity monitored at 614 nm against C343-Chol-BTP (concentration: 5.7 ⁇ M) in acetonitrile against the oxygen partial pressure.
- Analysis based on the Stern-Volmer equation shows that the partial pressure of oxygen in a solution can be measured by measuring the intensity ratio of fluorescence and phosphorescence.
- Table 1 shows phosphorescence spectra of (btq) 2 Ir (acac), (btiq) 2 Ir (acac), and (btph) 2 Ir (acac) in 1,2-dichloroethane. The phosphorescence of these compounds was dependent on oxygen concentration (data not shown).
- FIG. 7 shows the emission spectrum of C343-Chol-BTP (concentration 1 ⁇ M) in acetonitrile measured by changing the dissolved oxygen partial pressure. According to this, phosphorescence emission was observed under argon substitution conditions, and phosphorescence was quenched in the presence of oxygen.
- FIG. 9 plots the ratio of the fluorescence intensity monitored at 479 nm and the phosphorescence intensity monitored at 614 nm against the partial pressure of oxygen for C343-Pro4-BTP (concentration 1 ⁇ M) in the DMPC lipid bilayer membrane (liposome). Results are shown. Analysis based on the Stern-Volmer equation shows that the partial pressure of oxygen in a solution can be measured by measuring the intensity ratio of fluorescence and phosphorescence.
- the oxygen-responsive luminescent probe of the present invention may have a fluorescent group that emits short-lived (nanosecond order) fluorescence and a phosphorescent group that emits long-lived (microsecond order) phosphorescence in one molecule. It is a feature. Fluorescence is hardly affected by dissolved oxygen due to its short lifetime. On the other hand, since phosphorescence has a long lifetime, it collides with oxygen molecules within the excitation lifetime and undergoes significant quenching. Thus, for example, if a molecule that gives green fluorescence to the fluorophore and a molecule that gives red emission to the phosphor group, when no oxygen is present, the emission of both luminophores will mix and emit yellow light.
- the oxygen-responsive luminescent probe of the present invention can be used in fields such as analytical chemistry, life science, bioimaging field, medical diagnosis, cell biology, and environmental measurement. Specifically, it can be used as an oxygen concentration determination reagent, a hypoxic cell imaging reagent, a hypoxic tumor diagnostic reagent, and the like.
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Abstract
Description
一方、本発明者らは、イリジウム錯体((btp)2Ir(acac))が酸素濃度に依存してりん光を発することを発見し、イリジウム錯体((btp)2Ir(acac))の室温りん光(強度,寿命)を用いた生体組織中における酸素濃度計測方法を開発した(特許文献1)。また、(btp)2Ir(acac)のりん光強度,寿命の測定から,リポソーム膜中の酸素濃度の定量,癌細胞中の酸素濃度の可視化,担癌マウス中の腫瘍の可視化に成功した(特許文献1)。
さらに、酸素濃度に依存して近赤外領域にりん光を発する化合物も開発した(特許文献2)。さらに、水溶性を持たせたりん光化合物も開発した(特許文献3)。
そこで、濃度の影響を受けない方法として、発光寿命の変化を利用する方法が考えられているが、一般に発光寿命の測定にはパルスレーザーのような高価な光源と高度な光計測技術が必要なため、装置が大掛かりになってしまうという欠点を有する。
[1] リンカーと、該リンカーの第1の端に結合した酸素濃度応答性りん光団と、該リンカーの第2の端に結合したけい光団とを含む化合物。
[2] 酸素濃度応答性りん光団の三重項準位が、けい光団の三重項準位よりも小さいことを特徴とする、[1]に記載の化合物。
[3] 酸素濃度応答性りん光団がイリジウム錯体を含む基である、[1]または[2]に記載の化合物。
[4] イリジウム錯体が下記一般式(I)で表される構造を有する、[3]に記載の化合物。
[5] イリジウム錯体が下記(1)~(4)のいずれかの構造を有する、[3]に記載の化合物。
[6] けい光団が下記(5)~(7)のいずれかの基を含む、[1]~[5]のいずれかに記載の化合物。
[7] リンカーが下記(8)の構造を含む、[1]~[6]のいずれかに記載の化合物。
[8] リンカーがポリプロリンである、[1]~[6]のいずれかに記載の化合物。
[9] 下記化合物(9)または(13)である、[1]~[8]のいずれかに記載の化合物。
[10] [1]~[9]のいずれかに記載の化合物を含む酸素応答性発光プローブ。
イリジウム錯体は、Ir(III)を中心金属とし、芳香族系分子を配位子とする金属錯体を意味するが、例えば、下記文献1)~4)に開示されたようなものが例示される。配位子の芳香族系分子としては、当該配位子を含むイリジウム錯体がりん光を発するものであれば特に制限されないが、窒素原子、酸素原子、硫黄原子などのヘテロ原子を含む芳香族系配位子が好ましい。
1) S. Lamansky, P. Djurovich, D. Murphy, F. Abdel-Razzaq, H. Lee, C. Adachi, P. E. Burrows, S. R. Forrest, and M. E. Thompson, J. Am. Chem. Soc., 123, 4303 (2001).
2) H. Konno,Chem. Times, 199, 13 (2006).
3) M. Nonoyama, Bull. Chem. Soc. Jpn., 47, 767 (1974).
4) S. Sprouse, K. A. King, P. J. Spellane, and R. J. Watts, J. Am. Chem. Soc.,106, 6647 (1984)
XおよびYは 水素、またはアルキル基,アルコキシ基,アミノ基,ジメチルアミノ基,トリフルオロメチル基,シアノ基,アセチル基、カルボキシル基,アルキルエステル基,およびアルキルアミド基から選択される置換基を示す。
ステロイド、ポリペプチドは比較的容易に発光団と結合させることができるため、リンカーとして好適に使用しうる。また、ペプチド残基としてアスパラギン酸、リシンのような水溶性アミノ酸を含むペプチドを用いれば、発光プローブに水溶性を持たせることもできる。ポリペプチドとしてはアミノ酸残基数4-20のポリペプチドが好ましく、例えば、ポリプロリンが例示される。
例えば、リンカーとして下記のようなコレステロール骨格を含むものを用いることもできる。
また、化合物(10)および(11)も図1のエネルギー関係を満たしている。
また、化合物(13)も図1のエネルギー関係を満たしている。
一方、化合物(12)は図1のエネルギー関係を満たしていないが、その場合でも、剛直で長いリンカー(decaproline)を介して発光団を結合すれば、エネルギー移動が抑制され、けい光とりん光の両方を取り出すことができる。
(btp)2Ir(sa)の合成
2-ベンゾチエニルピリジン(1175.4mg,3.0mmol)、塩化イリジウム三水和物(純度:90%,1373.6mg,6.5mmol)に2-エトキシエタノール(90ml)、水(30ml)を加え、16時間還流した。溶液を室温まで冷却し生成した固体をろ過した。得られた固体(859mg,0.66mmol)、トリフルオロメタンスルホン酸銀(377.2mg,1.47mol)に脱水アセトン(120ml)を加え3時間還流し、溶液をろ過した。得られたろ液にスクシニルアセトン(308.8mg,1.95mol)、トリエチルアミン(1ml)を加え室温にて20時間撹拌した。溶液を減圧乾固し、得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム:メタノール(9:1,v/v))を用いて生成した(収量:993.5mg,収率:97.5%)。
1H HNR (300 MHz, d-DMSO, TMS, RT):δ 8.60-8.51(2H, m), 8.01-7.98(2H, d), 7.78-7.74(2H, q), 7.70-7.62(2H, q), 7.23-7.21(2H, q), 7.10-7.08(2H, q), 6.83-6.77(2H, t), 6.30-6.24(2H, t), 5.43(1H, s), 2.37-2.22(4H, m), 1.76(3H, s)
クマリン343(287.8mg,1.0mmol)、Fmocエチレンジアミン(345.2mg,1.08mmol)、ジイソプロピルエチルアミン(340μl,2mmol)にDMF(6ml)を加え縮合剤としてHATU(418mg,1.10mmol)を用いて、氷浴下3時間撹拌した。溶液に水を注ぎ、固体を析出させろ過した。得られた生成物をカラムクロマトグラフィー(展開溶媒:クロロホルム:メタノール9:1)を用いて生成した(収量:380mg、収率:69%)。得られた固体(380mg、0.69mmol)に2%DBU/DMF(10ml)溶液を加え3時間室温で撹拌した。溶液に水を加え、クロロホルムを用いて抽出を行い、クロロホルム溶液を硫酸ナトリウムで乾燥し、ろ過後、ろ液を減圧乾固した。得られた油状物質をエタノール(10ml)に溶解させ3β-ヒドロキシ-Δ5-コレン酸(262 mg、0.70mmol)、DMT-MM(415mg、1.5mmol)を加え、室温にて20時間撹拌した。反応液を減圧乾固し、得られた素生成物をカラムクロマトグラフィー(展開溶媒:クロロホルム:メタノール9:1)を用いて精製した(収量:280mg、収率:58%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 9.09(1H, s), 8.50(1H, s), 6.96(1H, s), 6.89(1H, s), 5.31(1H, s), 3.62-3.58(2H, t), 3.55-3.50(2H, t), 3.34(4H, m), 2.87-2.83(2H, t), 2.78-2.74(2H, t), 1.95(4H, m), 2.23-0.62(34H, m, cholesterol moiety)
C343-Cho24(101mg、0.148mol)、(btp)2Ir(sa) (122mg、0.158mol)、無水2-メチル-6-ニトロ安息香酸(MNBA、104mg、0.302mol)、ジメチルアミノピリジン(6.5mg、0.053mol)、トリエチルアミン(65μl、0.46mol)をDMF(8ml)に溶解させ、室温にて20時間撹拌した。反応液に水を注ぎ、酢酸エチルを用いて抽出を行い、酢酸エチル溶液を硫酸ナトリウムで乾燥し、ろ過後、ろ液を減圧乾固した。得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム)を用いて精製した(収量:85.5mg、収率:41%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 9.1(1H, s), 8.58(1H, s), 8.39(2H, d), 7.75(2H, q), 7.64-7.62(4H, d), 7.05-6.95(5H, m), 6.79(2H, d), 6.55(1H, s), 6.25-6.15(2H, m), 5.29(2H, s), 3.65-3.55(2H, m), 3.48-3.42(2H, m), 3.33(4H, m), 2.89(2H, t), 2.77(2H, t), 2.31-2.16(4H, m), 1.97(4H, m), 1.79(3H, s), 2.23-0.62(34H, m, cholesterol moiety)
C343-Chol-BTPの発光スペクトル
図3に示すようにC343-Chol-BTPの発光スペクトルは、C343のけい光とBTPのりん光からなる。酸素が存在しないアルゴン(Ar)置換下では、けい光とりん光の両方の発光が認められ、空気飽和下(aerated)ではりん光が消光し、けい光のみが観測される。けい光強度とりん光強度の比から酸素濃度を定量することができる。図4に、アセトニトリル中、空気飽和条件またはAr置換条件において、C343-Chol-BTP(濃度10.7μM)の発光の像を示した。その結果、C343-Chol-BTPは、空気飽和条件では青色、Ar置換条件では紫色を呈することがわかった。
ビス[2-(2'-ベンゾチエニル)-キノリナート- N,C3']イリジウム(アセチルアセトン)((btq)2Ir(acac))の合成
ベンゾ[b]チオフェン-2-イルボロン酸(990mg、5.6mmol)、2-クロロキノリン(937mg、5.7mmol)をトルエン(20ml)、エタノール(10ml)に溶解させ、パラジウム触媒(200mg、0.17mmol)、2M炭酸ナトリウム水溶液(20ml)を加え、N2置換下、5時間還流した。反応溶液を水に注ぎ、クロロホルムで抽出を行い、クロロホルム溶液を硫酸ナトリウムで乾燥し、ろ過後、ろ液を減圧乾固した。得られた固体をトルエンで洗浄した(収量:888mg、収率:61%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 8.20-8.17(1H, d), 8.15-8.12(1H, d), 7.98(1H, S), 7.96-7.93(1H, d), 7.91-7.88(1H, q), 7.86-7.83(1H, q), 7.82-7.79(1H, d), 7.75-7.70(1H, t), 7.55-7.50(1H, t), 7.39-7.36(2H, q)
2-ベンゾチエニルキノリン(581mg、2.2mmol)、塩化イリジウム三水和物(純度:90%、392mg、1.0mmol)に2-エトキシエタノール(30ml)、水(10ml)を加え、16時間還流した。溶液を室温まで冷却し生成した固体をろ過した。得られた固体(304mg、0.20mmol)に2-メトキシエタノール(25ml)、アセチルアセトン(1ml)、炭酸ナトリウム(170mg)を加え還流を加え2時間還流した。溶液を室温まで冷却し生成した固体をろ過した。得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム)を用いて生成した(収量:262mg、収率:79%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 8.17-8.14(2H, d), 8.01-7.98(2H, d), 7.85-7.83(2H, d), 7.75-7.73(2H, d), 7.71-7.68(2H, d), 7.37-7.32(2H, t), 7.73-7.23(2H, t), 7.02-6.97(2H, t), 6.57-6.52(2H, t), 6.32-6.30(2H, d), 4.63(1H, s), 1.55(6H, s)
ビス[1-(2'-ベンゾチエニル)-キノリナート- N,C3']イリジウム(アセチルアセトン)((btiq)2Ir(acac))の合成
ベンゾ[b]チオフェン-2-イルボロン酸(997mg、5.6mmol)、1-クロロイソキノリン(946mg、5.8mmol)をトルエン(20ml)、エタノール(10ml)に溶解させ、パラジウム触媒(220mg、0.19mmol)、2M炭酸ナトリウム水溶液(20ml)を加え、N2置換下、5時間還流した。反応溶液を水に注ぎ、クロロホルムで抽出を行い、クロロホルム溶液を硫酸ナトリウムで乾燥し、ろ過後、ろ液を減圧乾固した。得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム)を用いて生成した(収量:1.16g、収率:79%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 8.62-8.60(2H, d), 7.96-7.87(3H, m), 7.84(1H, s), 7.78-7.73(1H, d), 7.71-7.67(1H, d), 7.65-7.63(1H, d), 7.42-7.39(2H, m)
1-ベンゾチエニルイソキノリン(574mg、2.2mmol)、塩化イリジウム三水和物(純度:90%、398mg、1.0mmol)に2-エトキシエタノール(30ml)、水(10ml)を加え、16時間還流した。溶液を室温まで冷却し生成した固体をろ過した。得られた固体(250mg、0.17mmol)に2-メトキシエタノール(30ml)、アセチルアセトン(1ml)、炭酸ナトリウム(150mg)を加え還流した。溶液を室温まで冷却し生成した固体をろ過した。得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム)を用いて生成した(収量:50mg、収率:18%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 8.92-8.88(2H, d), 8.22-8.19(2H, d), 7.88-7.84(2H, m), 7.68-7.64(4H, m), 7.56-7.54(2H, d), 7.32-7.27(2H, m), 6.94-6.91(2H, d), 6.56-6.53(2H, m), 6.18-6.14(2H, d), 5.12(1H, s), 1.63(6H, s)
ビス[9-(2'-ベンゾチエニル)-フェナンスリナート- N,C3']イリジウム(アセチルアセトン)((btph)2Ir(acac))の合成
フェナンスリジノン(2.0g)にオキシ塩化リン(15ml)、ジメチルアニリン(0.63ml)を加え、3時間還流した。溶液を水に注ぎクロロホルムで抽出を行い、クロロホルム溶液を硫酸ナトリウムで乾燥し、ろ過後、ろ液を減圧乾固した。得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム)を用いて生成した(収量:2.1g,収率:96%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 8.63-8.60(1H, d), 8.55-8.52(1H, d), 8.50-8.48(1H, d), 8.11-8.09(1H, d), 7.94-7.92(1H, t), 7.79-7.66(3H, m)
ベンゾ[b]チオフェン-2-イルボロン酸(884mg、5.0mmol)、9-クロロフェナンスリジリン(1.0g、4.8mmol)をテトラヒドロフラン(30ml)、パラジウム触媒(160mg、0.14mmol)、2M炭酸ナトリウム水溶液(20ml)を加え、N2置換下、5時間還流した。反応溶液を水に注ぎ、クロロホルムで抽出を行い、クロロホルム溶液を硫酸ナトリウムで乾燥し、ろ過後、ろ液を減圧乾固した。得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム)を用いて生成した(収量:1.15g、収率:78%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 8.74-8.71(1H, d), 8.67-8.65(1H, d), 8.62-8.59(1H), 8.26-8.23(1H, d), 7.97-7.88(3H, m), 7.86(1H, s), 7.80-7.67(3H, m), 7.44-7.41(2H)
9-ベンゾチエニルフェナンスリジリン(706mg、2.3mmol)、塩化イリジウム三水和物(純度:90%、398mg、1.0mmol)に2-エトキシエタノール(30ml)、水(10ml)を加え、16時間還流した。溶液を室温まで冷却し生成した固体をろ過した。得られた固体(343mg、0.20mmol)に2-メトキシエタノール(20ml)、アセチルアセトン(1ml)、炭酸ナトリウム(180mg)を加え2時間還流した。溶液を室温まで冷却し生成した固体をろ過した。得られた固体をカラムクロマトグラフィー(展開溶媒:クロロホルム)を用いて生成した(収量:293mg、収率:80%)。
1H HNR (300 MHz, CDCl3, TMS, RT):δ 9.35-9.33(2H, d), 8.72-8.70(2H, d), 8.46-8.44(2H, d), 7.98-7.87(4H, m), 7.85-7.82(2H, d), 7.73-7.70(2H, d), 7.43-7.38(2H, t), 7.20-7.15(2H, t), 7.04-6.99(2H, m), 6.52-6.51(4H, d), 4.50(1H, s), 1.39(6H, s)
図7にアセトニトリル中のC343-Chol-BTP (濃度1μM)について、溶存酸素分圧を変えて測定した発光スペクトルを示す。それによると、アルゴン置換条件ではりん光の発光が見られ、酸素存在下ではりん光が消光しているのがわかる。
このプローブは脂溶性かつ、リポソーム中で凝集性を示さないため、細胞膜もしくは細胞内の小器官の膜に取り込まれると考えられる。したがって、細胞内の酸素濃度計測に有効であると考えられた。
これにより、本発明の酸素応答性発光プローブは分析化学、生命科学、バイオイメージング分野、医療診断、細胞生物学、環境計測などの分野に用いることができる。具体的には、酸素濃度定量試薬、低酸素細胞画像化試薬、低酸素腫瘍診断試薬などとして用いることができる。
Claims (10)
- リンカーと、該リンカーの第1の端に結合した酸素濃度応答性りん光団と、該リンカーの第2の端に結合したけい光団とを含む化合物。
- 酸素濃度応答性りん光団の三重項準位が、けい光団の三重項準位よりも小さいことを特徴とする、請求項1に記載の化合物。
- 酸素濃度応答性りん光団がイリジウム錯体を含む基である、請求項1または2に記載の化合物。
- リンカーがポリプロリンである、請求項1~6のいずれか一項に記載の化合物。
- 請求項1~9のいずれか一項に記載の化合物を含む酸素応答性発光プローブ。
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JP2010044059A (ja) * | 2008-07-16 | 2010-02-25 | Gunma Univ | 新規錯体化合物、並びにそれを用いた酸素濃度測定試薬および癌の診断薬 |
JP2013053901A (ja) * | 2011-09-02 | 2013-03-21 | Gunma Univ | レシオ法に基づいた酸素センサー |
JP2015101570A (ja) * | 2013-11-26 | 2015-06-04 | 国立大学法人群馬大学 | 新規化合物およびそれを利用した酸素濃度測定試薬 |
CN108948093A (zh) * | 2018-07-12 | 2018-12-07 | 南京邮电大学 | 具有单线态氧检测效应的磷光金属铱配合物及其制备方法与应用 |
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JP2015101570A (ja) * | 2013-11-26 | 2015-06-04 | 国立大学法人群馬大学 | 新規化合物およびそれを利用した酸素濃度測定試薬 |
CN108948093A (zh) * | 2018-07-12 | 2018-12-07 | 南京邮电大学 | 具有单线态氧检测效应的磷光金属铱配合物及其制备方法与应用 |
CN108948093B (zh) * | 2018-07-12 | 2020-10-02 | 南京邮电大学 | 具有单线态氧检测效应的磷光金属铱配合物及其制备方法与应用 |
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