US20170233414A1 - Derivatives of bodipy - Google Patents
Derivatives of bodipy Download PDFInfo
- Publication number
- US20170233414A1 US20170233414A1 US15/430,384 US201715430384A US2017233414A1 US 20170233414 A1 US20170233414 A1 US 20170233414A1 US 201715430384 A US201715430384 A US 201715430384A US 2017233414 A1 US2017233414 A1 US 2017233414A1
- Authority
- US
- United States
- Prior art keywords
- baa
- substituted
- unsubstituted
- compound
- aryl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 150000001875 compounds Chemical class 0.000 claims description 46
- 125000003118 aryl group Chemical group 0.000 claims description 18
- 125000003107 substituted aryl group Chemical group 0.000 claims description 14
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 11
- 125000002541 furyl group Chemical group 0.000 claims description 11
- 125000003226 pyrazolyl group Chemical group 0.000 claims description 11
- 125000000714 pyrimidinyl group Chemical group 0.000 claims description 11
- 125000002943 quinolinyl group Chemical group N1=C(C=CC2=CC=CC=C12)* 0.000 claims description 11
- 125000001544 thienyl group Chemical group 0.000 claims description 11
- 125000001041 indolyl group Chemical group 0.000 claims description 10
- 125000001624 naphthyl group Chemical group 0.000 claims description 10
- 125000004076 pyridyl group Chemical group 0.000 claims description 10
- 125000000335 thiazolyl group Chemical group 0.000 claims description 10
- 125000002183 isoquinolinyl group Chemical group C1(=NC=CC2=CC=CC=C12)* 0.000 claims description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 36
- -1 BAA compound Chemical class 0.000 description 27
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 21
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 18
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 15
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 13
- 125000000217 alkyl group Chemical group 0.000 description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 0 [1*]/C=C/C1=[N+]2C(=CC3=CC=C(/C(=C\[2*])CC(=O)O)N3[B-]2(F)F)C(C)=C1 Chemical compound [1*]/C=C/C1=[N+]2C(=CC3=CC=C(/C(=C\[2*])CC(=O)O)N3[B-]2(F)F)C(C)=C1 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- 229920005989 resin Polymers 0.000 description 12
- 210000004027 cell Anatomy 0.000 description 11
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000002835 absorbance Methods 0.000 description 8
- 238000004776 molecular orbital Methods 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 210000003463 organelle Anatomy 0.000 description 7
- 238000004895 liquid chromatography mass spectrometry Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 150000001299 aldehydes Chemical class 0.000 description 5
- 125000005842 heteroatom Chemical group 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- 238000006862 quantum yield reaction Methods 0.000 description 5
- 238000012216 screening Methods 0.000 description 5
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 150000003934 aromatic aldehydes Chemical class 0.000 description 4
- 125000000753 cycloalkyl group Chemical group 0.000 description 4
- 238000000295 emission spectrum Methods 0.000 description 4
- 125000001072 heteroaryl group Chemical group 0.000 description 4
- 125000000623 heterocyclic group Chemical group 0.000 description 4
- 125000000592 heterocycloalkyl group Chemical group 0.000 description 4
- 238000004128 high performance liquid chromatography Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 108091003079 Bovine Serum Albumin Proteins 0.000 description 3
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- PDALHXMAFGZQLN-UHFFFAOYSA-N COC1=CC=C(C(C)C)C2=CC=CC=C12 Chemical compound COC1=CC=C(C(C)C)C2=CC=CC=C12 PDALHXMAFGZQLN-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 125000003342 alkenyl group Chemical group 0.000 description 3
- 125000003545 alkoxy group Chemical group 0.000 description 3
- 125000000304 alkynyl group Chemical group 0.000 description 3
- 125000003368 amide group Chemical group 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 125000004093 cyano group Chemical group *C#N 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 239000007850 fluorescent dye Substances 0.000 description 3
- 150000004820 halides Chemical class 0.000 description 3
- 125000004438 haloalkoxy group Chemical group 0.000 description 3
- 125000001188 haloalkyl group Chemical group 0.000 description 3
- 125000004404 heteroalkyl group Chemical group 0.000 description 3
- 150000002576 ketones Chemical class 0.000 description 3
- 238000000386 microscopy Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/022—Boron compounds without C-boron linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/025—Boronic and borinic acid compounds
Definitions
- Single-molecule localization microscopy utilizes photoswitchable fluorophores to detect biological entities with 10-20 nm resolution.
- Multispectral superresolution microscopy extends SMLM functionality by improving its spectral resolution up to 5 fold facilitating imaging of multicomponent cellular structures or signaling pathways.
- Current commercial fluorophores are not ideal for MSSRM as they are not designed to photoswitch and do not adequately cover the visible and far-red spectral regions required for MSSRM imaging.
- fluorophores with narrow emission spectra and controllable photoswitching properties are necessary.
- R 1 is an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle and R 2 is H, an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle.
- R 2 is H, a substituted aryl, or a substituted aromatic heterocycle.
- the compounds have the structure:
- R 1 is an aryl, a substituted aryl, an aromatic heterocycle, or substituted aromatic heterocycle.
- R 1 is a substituted aryl or a substituted aromatic heterocycle.
- R 1 is a substituted or unsubstituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- R 1 is a substituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- the compounds have the structure:
- R 1 and R 2 are independently substituted or unsubstituted quinolinyl, isoquinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- R 1 and R 2 are both substituted or unsubstituted quinolinyl, isoquinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- R 1 is the same structure as R 2. Specific examples of R 1 and Regroups are shown in Table 1 herein.
- FIG. 1A is a plot showing the maximum absorbance vs maximum emission wavelength for all of the compounds in the BAA library. Particular compounds are indicated by arrows. The inset is a higher resolution view with three indicated compounds.
- FIG. 1B is a plot showing the quantum yield vs maximum emission wavelength for all of the compounds in the BAA library. Particular compounds are indicated by arrows.
- FIG. 1C is a plot showing the full width at half max vs maximum emission wavelength for all of the compounds in the BAA library. Particular compounds are indicated by arrows.
- FIG. 2A is a plot of the absorbance spectra of the indicated compounds.
- FIG. 2B is a plot of the emission spectra of the indicated compounds.
- FIG. 3 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells.
- FIG. 4 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells.
- FIG. 5 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells.
- FIG. 6 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells.
- FIG. 7A shows the molecular orbitals of BAA-37a.
- FIG. 7B shows the molecular orbitals of BAA-55a
- FIG. 7C shows the molecular orbitals of BAA-60b
- FIG. 7D shows the molecular orbitals of BAA-5a
- FIG. 7E shows the molecular orbitals of BAA-2a
- FIG. 7F shows the molecular orbitals of BAA-39a.
- BODIPY-based fluorophores were synthesized and characterized to create optimal photoswitchable fluorophores for MSSRM.
- BODIPY was chosen as the core structure as it is photostable, has high quantum yield, and controllable photoswitching.
- the BODIPY core was modified through the addition of various aromatic moieties, resulting in a spectrally diverse library.
- Photoswitching properties were characterized using a novel polyvinyl alcohol (PVA) based film methodology to isolate single molecules.
- PVA film methodology enabled photoswitching assessment without the need for protein conjugation, greatly improving screening efficiency of the BODIPY library.
- image buffer conditions were optimized for the BODIPY-based fluorophores through systematic testing of oxygen scavenger systems, redox components, and additives.
- image buffer conditions were optimized for the BODIPY-based fluorophores through systematic testing of oxygen scavenger systems, redox components, and additives.
- the disclosed compounds have the structure:
- R 1 is an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle and R 2 is H, an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle.
- R 2 is H, a substituted aryl, or a substituted aromatic heterocycle.
- the compounds have the structure:
- R 1 is an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle.
- R 1 is a substituted aryl or a substituted aromatic heterocycle.
- R 1 is a substituted or unsubstituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- R 1 is a substituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- the compounds are synthesized by attaching an aromatic aldehyde of general structure:
- X is a substituted aryl, aromatic heterocycle or substituted aromatic heterocycle to BODIPY via the following scheme.
- Reaction (a) is performed in the presence of DCM and DIEA, at room temperature for 20 h.
- reaction (b) R—CHO are added in the presence of DMSO-ACN (1:1), pyrrolidine, acetic acid, at 85° C. for 15 min;
- reaction (c) TFA-DCM (0.5:99.5), rt, 2 ⁇ 10 min.
- BODIPY FL was loaded onto CTC-PS resin in the following increments: 500 mg of BODIPY FL in 17.2 ml of DCM was added to 5 g of CTC-PS resin in 14.9 ml of DIEA, protected from light, and placed on the shaker overnight. This was washed 3 times in dichloromethane (DCM), 3 times in dimethylformamide (DMF), 3 times in methanol, 3 additional times in DMF, 3 ⁇ DCM and dried with ethyl ether, resulting in 90% BODIPY FL retained on the resin.
- DCM dichloromethane
- DMF dimethylformamide
- the BODIPY FL loaded CTC-PS resin (100 mg in 3 ml of a 1:1 mixture of dimethylsulfoxide (DMSO) and acetonitrile (ACN)) and 15 equivalents of aldehyde solution (0.45 mmol in 1 ml of a 1:1 mixture of DMSO and ACN) were mixed with 65 equivalents of acetic acid (105 pl, 2 mmol) and 65 equivalents of pyrrolidine (150 ⁇ l, 2 mmol) at 85° C. for 15 min.
- the resin was washed 3 times in DCM and 3 times in DMF—and this cycle (3 ⁇ in DCM, 3 ⁇ in DMF) was repeated three times.
- the resin was then washed 3 ⁇ in ethyl ether before cleaving the formed BAA compound with 0.5% TFA in DCM.
- the BAA compounds were purified via HPLC and dried using a Labconco freeze dryer.
- Table 2 shows the spectroscopic properties of the BAA library:
- Alkyl a branched or unbranched saturated or unsaturated hydrocarbon group, such as, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, tetradecyl, hexadecyl, eicosyl, tetracosyl and the like.
- a lower alkyl group is a saturated branched or unbranched hydrocarbon having from 1 to 6 carbon atoms (C 1-6 alkyl).
- a C 2 or greater alkyl, a C3 or greater alkyl, a C4 or greater alkyl, etc. refers to a branched or unbranched saturated or unsaturated hydrocarbon group of two or more, three or more, four or more, etc. carbons.
- alkyl also encompasses cycloalkyls.
- Alkyl also encompasses substituted alkyls which are alkyl groups wherein one or more hydrogen atoms are replaced with a substituent such as, alkyl, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ether, ketone, aldehyde, hydroxyl, carboxyl, cyano, amido, haloalkyl, haloalkoxy, or alkoxy.
- alkyl also encompasses heteroalkyls.
- a heteroalkyl contains at least one heteroatom such as nitrogen, oxygen, sulfur, or phosphorus replacing one or more of the carbons. Substituted heteroalkyls are also encompassed by the term alkyl.
- Amino a saturated or unsaturated nitrogen group.
- An amino group includes an unsubstituted amino (—NH 2 or —NH 3 + ) or substituted amino.
- a substituted amino generally has the structure —NQ 1 Q 2 or —NQ 1 Q 2 Q 3 + where at least one of Q 1 , Q 2 and Q 3 are selected from an alkyl (including a substituted alkyl) as described above or any other substituent including, for example, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ether, ketone, aldehyde, hydroxyl, carboxyl, cyano, amido, haloalkyl, haloalkoxy, or alkoxy.
- substituted amino groups include the following structures: —NHCH 3 , —N(CH 3 ) 2 —NH(CH 3 ) 2 + —N(CH3) 3 + , NHCH 2 CH 3 , NH 2 CH 2 CH 3 + , NCH 3 CH 2 CH 3 , N(CH 2 CH 3 ) 2 , NHCH 3 CH 2 CH 3 + .
- Amino groups also include cyclic structures and structures including other heteroatoms such as oxygen, sulfur or phosphorus. Cyclic amino structures include 4-member single nitrogen (azetidinyl), 5-member single nitrogen (pyrrolidinyl), or 6-member single nitrogen (piperidinyl) structures as well as double nitrogen structures, as well as substituted cyclic amino structures.
- Aryl any carbon-based aromatic group including, benzyl, naphthyl, and phenyl.
- aryl also contemplates substituted aryls in which one or more of the hydrogens is substituted with one or more groups including alkyl, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ether, ketone, aldehyde, hydroxy, carboxylic acid, cyano, amido, haloalkyl, haloalkoxy, or alkoxy.
- aryl also contemplates heteroaryls in which one or more of the carbons is replaced by a heteroatom. Examples of heteroatoms include, nitrogen, oxygen, sulfur, and phosphorous. Substituted heteroaryls are also encompassed by the term aryl.
- Cycloalkyl a non-aromatic carbon-based ring composed of at least three carbon atoms.
- Examples of cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
- Cycloalkyls also encompass substituted cycloalkyls and heterocycloalkyls where at least one of the carbon atoms is replaced with a heteroatom such as nitrogen, sulfur or phosphorus.
- a heterocycloalkyl wherein one or more of the carbons is replaced with nitrogen is also termed a cycloalkylamino herein. The term also encompasses substituted heterocycloalkyls.
- Heterocycle A group that encompasses both heteroaryls and heterocycloalkyls. Heteroaryls can also be termed aromatic heterocycles. Heterocycles may be monocyclic or polycyclic rings. Exemplary heterocycles include azepinyl, aziridinyl, azetyl, azetidinyl, diazepinyl, dithiadiazinyl, dioxazepinyl, dioxolanyl, dithiazolyl, furanyl, isooxazolyl, isothiazolyl, imidazolyl, morpholinyl, oxetanyl, oxadiazolyl, oxiranyl, oxazinyl, oxazolyl, piperazinyl, pyrazinyl, pyridazinyl, pyrimidinyl, piperidyl, piperidino, pyridyl, pyranyl, pyrazolyl,
- Fluorescent Dye a small molecule that absorbs light at one wavelength and then emits light at a second wavelength. Dyes of different structure emit at different wavelengths and, as a result, multiple fluorescent dyes can be distinguishable from one another and can label multiple targets simultaneously.
- the compositions disclosed herein can be used as fluorescent dyes.
- Reagents and Conditions (a) DCM, DIEA, rt, 20 h; (b) R—CHO (79 aromatic aldehydes shown in the tables herein), DMSO-ACN (1:1), pyrrolidine, acetic acid, 85° C., 15 min; (c) TFA-DCM (0.5:99.5), rt, 2 ⁇ 10 min.
- BODIPY FL was loaded onto CTC—PS resin in the following increments: 500 mg of BODIPY FL in 17.2 ml of DCM added to 5 g of CTC—PS resin in 14.9 ml of DIEA, protected from light on shaker overnight, washed 3 ⁇ DCM, 3 ⁇ DMF, 3 ⁇ MeOH, 3 ⁇ DMF, 3 ⁇ DMC and dried with ethyl ether, resulting in 90% BODIPY FL retained on resin.
- BODIPY FL loaded CTC—PS resin 100 mg in 3 ml of 1:1 DMOS:ACN
- 15 equiv aldehyde (0.45 mmol in 1 ml 1:1 DMSO:ACN) were mixed with 65 equivalent acetic acid (105 pl, 2 mmol) and 65 equivalent pyrrolidine (150 pl, 2 mmol) at 85° C. for 15 min.
- the resin was washed 3 ⁇ (3 ⁇ DMC, 3 ⁇ DMF), 3 ⁇ ethyl ether before cleaving the formed BAA compound with 0.5% TFA in DCM.
- the BAA compounds were purified via HPLC and dried with Labconco freeze dryer.
- BAA Library Characterization of BAA Library. All BAA compounds were characterized by LC/MS for m/z ratio and purity. Marvin Sketch was used for chemical characterization of structures. Molecular orbital calculations were performed using the density functional theory (DFT) at B3LYP/6-31G level. The six BAA compounds selected for CLSM imaging were characterized further by 1 H and 13 C NMR (See Supporting Information).
- DFT density functional theory
- Quantum yields were determined by comparing the area under the emission spectrum of the BAA compound to a reference fluorophore solution at three concentrations using equation 1, where Grad represents the gradient from the plots of integrated fluorescence intensity vs absorbance at three concentrations and q is the refractive index of the solvent.
- ⁇ fl sample ⁇ fl reference ⁇ ( Grad ⁇ sample Grad ⁇ reference ) ⁇ ( ⁇ sample ⁇ reference ) 2 ( 1 )
- U2OS cells were cultured in Dulbecco's Modified Eagle Medium without phenol red (Invitrogen) supplemented with 10% fetal bovine serum and 1% Penicillin-Streptomycin-Glutamine at 37° C. and 5% CO 2 . Cells were plated in a 96-well glass bottom plate and incubated for 3 days to reach 50% confluency.
- each embodiment disclosed herein can comprise, consist essentially of or consist of its particular stated element, step, ingredient or component.
- the terms “include” or “including” should be interpreted to recite: “comprise, consist of, or consist essentially of.”
- the transition term “comprise” or “comprises” means includes, but is not limited to, and allows for the inclusion of unspecified elements, steps, ingredients, or components, even in major amounts.
- the transitional phrase “consisting of” excludes any element, step, ingredient or component not specified.
- the transition phrase “consisting essentially of” limits the scope of the embodiment to the specified elements, steps, ingredients or components and to those that do not materially affect the embodiment.
- the term “about” has the meaning reasonably ascribed to it by a person skilled in the art when used in conjunction with a stated numerical value or range, i.e. denoting somewhat more or somewhat less than the stated value or range, to within a range of ⁇ 10% of the stated value; ⁇ 9% of the stated value; ⁇ 8% of the stated value; ⁇ 7% of the stated value; ⁇ 6% of the stated value; ⁇ 5% of the stated value; ⁇ 4% of the stated value; ⁇ 3% of the stated value; ⁇ 2% of the stated value; or ⁇ 1% of the stated value.
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Abstract
Description
- This application claims the benefit of U.S. Provisional Patent Application 62/294,624, filed Feb. 12, 2016, and entitled DERIVATIVES OF BODIPY, the entire disclosure of which is incorporated by reference herein.
- Single-molecule localization microscopy (SMLM) utilizes photoswitchable fluorophores to detect biological entities with 10-20 nm resolution. Multispectral superresolution microscopy (MSSRM) extends SMLM functionality by improving its spectral resolution up to 5 fold facilitating imaging of multicomponent cellular structures or signaling pathways. Current commercial fluorophores are not ideal for MSSRM as they are not designed to photoswitch and do not adequately cover the visible and far-red spectral regions required for MSSRM imaging. To obtain optimal MSSRM spatial and spectral resolution, fluorophores with narrow emission spectra and controllable photoswitching properties are necessary.
- Disclosed are compounds with the structure:
- where R1 is an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle and R2 is H, an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle. In examples, R2 is H, a substituted aryl, or a substituted aromatic heterocycle.
- In further examples, the compounds have the structure:
- where R1 is an aryl, a substituted aryl, an aromatic heterocycle, or substituted aromatic heterocycle. In examples, R1 is a substituted aryl or a substituted aromatic heterocycle. In examples, R1 is a substituted or unsubstituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl. In further examples R1 is a substituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- In still further examples, the compounds have the structure:
- where R1 and R2 are independently substituted or unsubstituted quinolinyl, isoquinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl. In other examples, R1 and R2 are both substituted or unsubstituted quinolinyl, isoquinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl. In still other examples, R1 is the same structure as R2. Specific examples of R1 and Regroups are shown in Table 1 herein.
- It is an object of the invention to provide fluorophores with narrow emission spectra and controllable photoswitching properties.
- Some of the drawings are better understood when presented in color. Applicants consider the color drawings to be part of the original disclosure and reserve the right to present color versions of the drawings in later proceedings.
-
FIG. 1A is a plot showing the maximum absorbance vs maximum emission wavelength for all of the compounds in the BAA library. Particular compounds are indicated by arrows. The inset is a higher resolution view with three indicated compounds. -
FIG. 1B is a plot showing the quantum yield vs maximum emission wavelength for all of the compounds in the BAA library. Particular compounds are indicated by arrows. -
FIG. 1C is a plot showing the full width at half max vs maximum emission wavelength for all of the compounds in the BAA library. Particular compounds are indicated by arrows. -
FIG. 2A is a plot of the absorbance spectra of the indicated compounds. -
FIG. 2B is a plot of the emission spectra of the indicated compounds. -
FIG. 3 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells. -
FIG. 4 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells. -
FIG. 5 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells. -
FIG. 6 is a set of images showing the organelle specificity of the indicated compounds in fixed U2OS cells. -
FIG. 7A shows the molecular orbitals of BAA-37a. -
FIG. 7B shows the molecular orbitals of BAA-55a -
FIG. 7C shows the molecular orbitals of BAA-60b -
FIG. 7D shows the molecular orbitals of BAA-5a -
FIG. 7E shows the molecular orbitals of BAA-2a -
FIG. 7F shows the molecular orbitals of BAA-39a. - Herein, a library of BODIPY-based fluorophores was synthesized and characterized to create optimal photoswitchable fluorophores for MSSRM. BODIPY was chosen as the core structure as it is photostable, has high quantum yield, and controllable photoswitching. The BODIPY core was modified through the addition of various aromatic moieties, resulting in a spectrally diverse library. Photoswitching properties were characterized using a novel polyvinyl alcohol (PVA) based film methodology to isolate single molecules. The PVA film methodology enabled photoswitching assessment without the need for protein conjugation, greatly improving screening efficiency of the BODIPY library. Additionally, image buffer conditions were optimized for the BODIPY-based fluorophores through systematic testing of oxygen scavenger systems, redox components, and additives. Through screening the photoswitching properties of BODIPY-based compounds in PVA films with optimized imaging buffer we identified novel fluorophores well suited for SMLM and MSSRM. Such compounds have longer Stokes shifts than commercial fluorophores.
- The disclosed compounds have the structure:
- where R1 is an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle and R2 is H, an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle. In examples, R2 is H, a substituted aryl, or a substituted aromatic heterocycle. In further examples, the compounds have the structure:
- where R1 is an aryl, a substituted aryl, an aromatic heterocycle, or a substituted aromatic heterocycle. In examples, R1 is a substituted aryl or a substituted aromatic heterocycle. In examples, R1 is a substituted or unsubstituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl. In further examples, R1 is a substituted quinolinyl, indolyl, benzyl, naphthyl, pyrimidinyl, thiophenyl, pyrazolyl, thiazolyl, pyridinyl, or furanyl.
- The compounds are synthesized by attaching an aromatic aldehyde of general structure:
- where X is a substituted aryl, aromatic heterocycle or substituted aromatic heterocycle to BODIPY via the following scheme.
- where the aromatic aldehyde is indicated in the scheme by the following structure:
- Reaction (a) is performed in the presence of DCM and DIEA, at room temperature for 20 h. In reaction (b) R—CHO are added in the presence of DMSO-ACN (1:1), pyrrolidine, acetic acid, at 85° C. for 15 min; (c) TFA-DCM (0.5:99.5), rt, 2×10 min.
- More specifically, BODIPY FL was loaded onto CTC-PS resin in the following increments: 500 mg of BODIPY FL in 17.2 ml of DCM was added to 5 g of CTC-PS resin in 14.9 ml of DIEA, protected from light, and placed on the shaker overnight. This was washed 3 times in dichloromethane (DCM), 3 times in dimethylformamide (DMF), 3 times in methanol, 3 additional times in DMF, 3× DCM and dried with ethyl ether, resulting in 90% BODIPY FL retained on the resin.
- The BODIPY FL loaded CTC-PS resin (100 mg in 3 ml of a 1:1 mixture of dimethylsulfoxide (DMSO) and acetonitrile (ACN)) and 15 equivalents of aldehyde solution (0.45 mmol in 1 ml of a 1:1 mixture of DMSO and ACN) were mixed with 65 equivalents of acetic acid (105 pl, 2 mmol) and 65 equivalents of pyrrolidine (150 μl, 2 mmol) at 85° C. for 15 min. The resin was washed 3 times in DCM and 3 times in DMF—and this cycle (3× in DCM, 3× in DMF) was repeated three times. The resin was then washed 3× in ethyl ether before cleaving the formed BAA compound with 0.5% TFA in DCM. The BAA compounds were purified via HPLC and dried using a Labconco freeze dryer.
- Specific structures and purity data are as follows:
-
RT Purity Product R1 R2 m/z calc m/z exp (min) (%) BAA-1b =R1 698.15 699.15 7.83 92 BAA-2a H 419.16 400.16a 7.66 >99 BAA-3a H 566.07 567.95 8.07 98 BAA-3b =R1 840.02 863.25b 8.21 97 BAA-4a H 478.24 479.24 6.02 >99 BAA-5a H 470.18 471.19 8.26 >99 BAA-6a H 449.17 472.18b 7.69 82 BAA-7a H 454.19 477.27b 8.64 83 BAA-7b =R1 616.26 617.26 7.32 88 BAA-8a H 460.18 461.19 8.31 80 BAA-9a H 454.17 455.13 8.15 92 BAA-10b =R1 610.33 611.35 9.45 >99 BAA-11a H 514.22 515.22 8.98 91 BAA-12a H 456.16 474.19c 7.69 88 BAA-13a H 428.15 429.15 7.28 90 BAA-14a H 442.17 465.16b 9.15 83 BAA-15a H 450.19 451.19 8.83 96 BAA-16a H 422.2 445.19b 9.08 98 BAA-17a H 456.18 479.17b 9.09 85 BAA-18a H 486.19 509.18b 8.94 92 BAA-19a H 462.14 485.13 8.94 96 BAA-20a H 442.14 443.15 8.07 98 BAA-21a H 516.2 497.21a 9.13 95 BAA-21b =R1 740.29 741.29 7.82 92 BAA-22a H 534.19 515.20a 8.65 94 BAA-22b =R1 776.27 777.28 7.51 90 BAA-23a H 525.16 526.18 9.05 >99 BAA-23b =R1 758.21 739.13 7.93 89 BAA-24b =R1 719.98 700.98a 7.46 94 BAA-25a H 524.73 547.12b 9.30 93 BAA-25b =R1 756.14 757.15 7.88 95 BAA-26b =R1 672.32 673.33 7.56 98 BAA-27b =R1 720.16 683.22 7.19 97 BAA-28a H 454.24 435.28 6.69 88 BAA-28b =R1 616.35 617.37 6.99 97 BAA-29b =R1 604.03 605.03 8.14 86 BAA-30a H 491.18 492.19 7.41 96 BAA-31b =R1 536.28 497.15d 6.34 94 BAA-32a H 517.16 478.15d 8.77 >99 BAA-33a H 536.04 559.02b 7.94 98 BAA-34b =R1 702.07 683.06a 7.69 94 BAA-35b =R1 702.22 703.15 8.49 86 BAA-36b =R1 742.17 743.18 8.16 94 BAA-37a H 457.18 438.18a 5.75 88 BAA-37b =R1 622.24 623.24 5.78 >99 BAA-38a H 450.2 451.21 6.28 99 BAA-39a H 415.11 451.21g 5.99 94 BAA-40b =R1 876.26 877.27 7.96 89 BAA-41b =R1 768.32 769.33 7.61 94 BAA-42a H 568.09 501.17a 6.17 82 BAA-43a H 534.13 501.17f 6.13 94 BAA-44b =R1 876.26 877.27 8.15 92 BAA-45a H 538.75 562.14b 9.29 >99 BAA-45b =R1 784.17 785.17 8.24 96 BAA-46b =R1 740.29 741.28 7.69 94 BAA-47a H 468.2 491.20b 8.62 94 BAA-48a H 525.2 548.19b 8.24 >99 BAA-49b =R1 638.21 619.21a 6.58 >99 BAA-50a H 460.19 483.18b 8.07 >99 BAA-50b =R1 628.26 629.25 6.94 >99 BAA-51a H 491.18 514.16b 7.59 89 BAA-52a H 498.13 499.12 7.86 83 BAA-53a H 440.17 441.17 7.57 >99 BAA-54a H 432.1 433.09 7.98 89 BAA-55a H 460.19 461.18 7.30 >99 BAA-55b =R1 628.26 629.26 6.89 89 BAA-56a H 463.13 464.13 5.87 >99 BAA-56b =R1 634.15 635.15 7.84 84 BAA-57a H 474.2 475.21 6.10 85 BAA-57b =R1 656.29 657.30 8.01 >99 BAA-58a H 514.19 515.18 8.20 >99 BAA-59a H 535.15 553.16 7.37 96 BAA-60b =R1 644.07 645.08 8.11 99 BAA-61a H 496.22 497.21 7.32 98 BAA-62a H 431.16 449.16c 6.81 >99 BAA-63a H 479.14 502.15b 7.05 93 BAA-64a H 480.13 481.11 7.50 91 BAA-65a H 464.15 427.14d 8.82 88 BAA-66a H 497.09 498.10 9.09 93 BAA-67a H 517.18 518.18 9.02 92 BAA-68a H 463.13 464.14 8.27 >99 BAA-69a H 525.1 526.09 9.08 >99 BAA-70a H 525.16 526.18 8.95 99 BAA-71a H 541.16 542.17 9.06 >99 BAA-72a H 493.16 511.17c 8.13 98 BAA-73a H 502.09 503.08 7.95 >99 BAA-74a H 604.22 627.21b 8.02 92 BAA-74b =R1 916.32 897.32c 7.01 94 BAA-75a H 501.21 482.22 10.99 >99 BAA-75b =R1 710.31 711.32 6.38 94 BAA-76a H 510.13 491.13a 90.31 98 BAA-77a H 525.2 506.21a 8.52 99 BAA-78a H 531.18 512.18a 8.72 >99 BAA-78b =R1 770.24 771.24 7.73 98 BAA-79a H 494.14 457.13d 9.421 91 LC/MS Conditions: A: H2O—CH2O2: 99.9:0.1. B: ACN—CH2O2: 99.9:0.1; gradient 5% B to 30% B (1 min), gradient 30% B to 95% B (4.5 min), isocratic 95% B (4.5 min), flowrate: 0.4 ml/min. ESI (+) m/z signal found correspond to (M + H) except a: (M − F), b: (M + Na), c: (M + NH4), d: (M − 2F + H), e: (M − 2Cl + H), and f: (M − Cl); g: Cl replaced by pyrrolidine during synthesis reaction. Purity was determined by integration of the LC/MS absorbance peaks at 254 nm. =R1 indicates that R2 is the same structure as R1. - Table 2 shows the spectroscopic properties of the BAA library:
-
λmax ABS λmax EM Stokes Shift Product (nm) (nm) (nm) φfl FWHM BAA-1b 580 597 17 0.62 40 BAA-2a 601 635 34 0.62 57 BAA-3a 569 579 10 0.61 31 BAA-3b 574 587 13 0.70 34 BAA-4a 581 600 19 0.43 56 BAA-5a 592 615 23 0.83 47 BAA-6a 609 643 34 0.18 64 BAA-7a 582 600 18 0.29 63 BAA-7b 581 600 19 0.43 56 BAA-8a 594 623 29 0.50 61 BAA-9a 569 579 10 0.35 32 BAA-10b 632 714 82 0.01 102 BAA-11a 575 589 14 0.86 33 BAA-12a 589 616 27 0.10 88 BAA-13a 576 586 10 0.19 44 BAA-14a 594 607 13 0.44 70 BAA-15a 581 597 16 0.42 39 BAA-16a 552 610 58 0.22 78 BAA-17a 579 591 12 0.59 42 BAA-18a 577 593 16 0.65 37 BAA-19a 582 595 13 0.64 35 BAA-20a 577 585 8 0.15 31 BAA-21a 585 611 26 0.51 46 BAA-21b 588 608 20 0.54 50 BAA-22a 585 602 17 0.39 49 BAA-22b 582 601 19 0.27 46 BAA-23a 592 603 11 0.23 30 BAA-23b 580 588 8 0.19 32 BAA-24b 570 579 9 0.29 32 BAA-25a 571 580 9 0.19 32 BAA-25b 572 580 8 0.18 32 BAA-26b 582 604 22 0.30 51 BAA-27b 575 588 13 0.33 35 BAA-28a 480 592 112 0.04 52 BAA-28b 580 598 18 0.58 43 BAA-29b 569 580 11 0.13 37 BAA-30a 607 643 36 0.43 58 BAA-31b 576 588 12 0.28 34 BAA-32a 574 584 10 0.23 32 BAA-33a 575 587 12 0.15 35 BAA-34b 570 581 11 0.96 31 BAA-35b 571 580 9 0.25 32 BAA-36b 579 592 13 0.35 37 BAA-37a 568 578 10 0.54 55 BAA-37b 569 578 9 0.55 30 BAA-38a 579 581 2 0.07 33 BAA-39a 606 657 51 0.19 79 BAA-40b 583 601 18 0.26 45 BAA-41b 582 602 20 0.36 47 BAA-42a 570 580 10 0.36 30 BAA-43a 569 579 10 0.45 31 BAA-44b 582 600 18 0.28 43 BAA-45b 570 579 9 0.50 30 BAA-45a 571 580 9 0.22 31 BAA-46b 572 585 13 0.61 33 BAA-47a 589 611 22 0.33 47 BAA-48a 603 641 38 0.45 60 BAA-49b 571 580 9 0.14 33 BAA-50a 571 581 10 0.28 33 BAA-50b 572 581 9 0.12 34 BAA-51a 594 607 13 0.06 42 BAA-52a 577 585 8 0.04 51 BAA-53a 570 581 11 0.44 30 BAA-54a 573 581 8 0.04 46 BAA-55a 576 592 16 0.75 35 BAA-55b 575 591 16 0.75 38 BAA-56a 585 595 10 0.91 32 BAA-56b 586 597 11 0.15 35 BAA-57a 574 590 16 0.75 45 BAA-57b 575 591 16 0.75 38 BAA-58a 572 582 10 0.70 30 BAA-59a 571 581 10 0.53 30 BAA-60b 588 604 16 0.47 37 BAA-61a 573 587 14 1.00 35 BAA-62a 579 594 15 0.68 33 BAA-63a 592 607 15 0.43 39 BAA-64a 576 593 17 0.80 37 BAA-65a 606 622 16 0.21 54 BAA-66a 587 598 11 0.28 34 BAA-67a 587 598 11 0.15 61 BAA-68a 585 595 10 0.17 30 BAA-69a 577 589 12 0.85 30 BAA-70a 580 588 8 0.17 33 BAA-71a 580 589 9 0.19 32 BAA-72a 580 590 10 0.40 31 BAA-73a 579 593 14 0.55 46 BAA-74a 584 602 18 0.15 59 BAA-74b 583 600 17 0.22 51 BAA-75a 614 663 49 0.08 91 BAA-75b 605 660 55 0.18 91 BAA-76a 613 634 21 0.21 55 BAA-77a 603 634 31 0.50 61 BAA-78a 581 592 11 0.19 46 BAA-78b 579 593 14 0.37 39 BAA-79a 606 630 24 0.63 49 - Terms:
- Alkyl: a branched or unbranched saturated or unsaturated hydrocarbon group, such as, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, tetradecyl, hexadecyl, eicosyl, tetracosyl and the like. A lower alkyl group is a saturated branched or unbranched hydrocarbon having from 1 to 6 carbon atoms (C1-6 alkyl). Similarly, a C2 or greater alkyl, a C3 or greater alkyl, a C4 or greater alkyl, etc. refers to a branched or unbranched saturated or unsaturated hydrocarbon group of two or more, three or more, four or more, etc. carbons. The term alkyl also encompasses cycloalkyls. Alkyl also encompasses substituted alkyls which are alkyl groups wherein one or more hydrogen atoms are replaced with a substituent such as, alkyl, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ether, ketone, aldehyde, hydroxyl, carboxyl, cyano, amido, haloalkyl, haloalkoxy, or alkoxy. The term alkyl also encompasses heteroalkyls. A heteroalkyl contains at least one heteroatom such as nitrogen, oxygen, sulfur, or phosphorus replacing one or more of the carbons. Substituted heteroalkyls are also encompassed by the term alkyl.
- Amino: a saturated or unsaturated nitrogen group. An amino group includes an unsubstituted amino (—NH2 or —NH3 +) or substituted amino. A substituted amino generally has the structure —NQ1Q2 or —NQ1Q2Q3 + where at least one of Q1, Q2 and Q3 are selected from an alkyl (including a substituted alkyl) as described above or any other substituent including, for example, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ether, ketone, aldehyde, hydroxyl, carboxyl, cyano, amido, haloalkyl, haloalkoxy, or alkoxy. Examples of substituted amino groups include the following structures: —NHCH3, —N(CH3)2 —NH(CH3)2 +—N(CH3)3 +, NHCH2CH3, NH2CH2CH3 +, NCH3CH2CH3, N(CH2CH3)2, NHCH3CH2CH3 +. Amino groups also include cyclic structures and structures including other heteroatoms such as oxygen, sulfur or phosphorus. Cyclic amino structures include 4-member single nitrogen (azetidinyl), 5-member single nitrogen (pyrrolidinyl), or 6-member single nitrogen (piperidinyl) structures as well as double nitrogen structures, as well as substituted cyclic amino structures.
- Aryl: any carbon-based aromatic group including, benzyl, naphthyl, and phenyl. The term aryl also contemplates substituted aryls in which one or more of the hydrogens is substituted with one or more groups including alkyl, alkynyl, alkenyl, aryl, halide, nitro, amino, ester, ether, ketone, aldehyde, hydroxy, carboxylic acid, cyano, amido, haloalkyl, haloalkoxy, or alkoxy. The term aryl also contemplates heteroaryls in which one or more of the carbons is replaced by a heteroatom. Examples of heteroatoms include, nitrogen, oxygen, sulfur, and phosphorous. Substituted heteroaryls are also encompassed by the term aryl.
- Cycloalkyl: a non-aromatic carbon-based ring composed of at least three carbon atoms. Examples of cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl. Cycloalkyls also encompass substituted cycloalkyls and heterocycloalkyls where at least one of the carbon atoms is replaced with a heteroatom such as nitrogen, sulfur or phosphorus. A heterocycloalkyl wherein one or more of the carbons is replaced with nitrogen is also termed a cycloalkylamino herein. The term also encompasses substituted heterocycloalkyls.
- Heterocycle: A group that encompasses both heteroaryls and heterocycloalkyls. Heteroaryls can also be termed aromatic heterocycles. Heterocycles may be monocyclic or polycyclic rings. Exemplary heterocycles include azepinyl, aziridinyl, azetyl, azetidinyl, diazepinyl, dithiadiazinyl, dioxazepinyl, dioxolanyl, dithiazolyl, furanyl, isooxazolyl, isothiazolyl, imidazolyl, morpholinyl, oxetanyl, oxadiazolyl, oxiranyl, oxazinyl, oxazolyl, piperazinyl, pyrazinyl, pyridazinyl, pyrimidinyl, piperidyl, piperidino, pyridyl, pyranyl, pyrazolyl, pyrrolyl, pyrrolidinyl, thiatriazolyl, tetrazolyl, thiadiazolyl, triazolyl, thiazolyl, thienyl, tetrazinyl, thiadiazinyl, triazinyl, thiazinyl, thiopyranyl, furoisoxazolyl, imidazothiazolyl, thienoisothiazolyl, thienothiazolyl, imidazopyrazolyl, cyclopentapyrazolyl, pyrrolopyrrolyl, thienothienyl, thiadiazolopyrimidinyl, thiazolothiazinyl, thiazolopyrimidinyl, thiazolopyridinyl, oxazolopyrimidinyl, oxazolopyridyl, benzoxazolyl, benzisothiazolyl, benzothiazolyl, imidazopyrazinyl, purinyl, pyrazolopyrimidinyl, imidazopyridinyl, benzimidazolyl, indazolyl, benzoxathiolyl, benzodioxolyl, benzodithiolyl, indolizinyl, indolinyl, isoindolinyl, furopyrimidinyl, furopyridyl, benzofuranyl, isobenzofuranyl, thienopyrimidinyl, thienopyridyl, benzothienyl, cyclopentaoxazinyl, cyclopentafuranyl, benzoxazinyl, benzothiazinyl, quinazolinyl, naphthyridinyl, quinolinyl, isoquinolinyl, benzopyranyl, pyridopyridazinyl and pyridopyrimidinyl groups. The term also contemplates substituted heterocycles, including substituted forms of all the species listed above.
- Fluorescent Dye: a small molecule that absorbs light at one wavelength and then emits light at a second wavelength. Dyes of different structure emit at different wavelengths and, as a result, multiple fluorescent dyes can be distinguishable from one another and can label multiple targets simultaneously. The compositions disclosed herein can be used as fluorescent dyes.
- Scheme 1
- Synthesis of BAA Library
- Reagents and Conditions: (a) DCM, DIEA, rt, 20 h; (b) R—CHO (79 aromatic aldehydes shown in the tables herein), DMSO-ACN (1:1), pyrrolidine, acetic acid, 85° C., 15 min; (c) TFA-DCM (0.5:99.5), rt, 2×10 min.
- Experimentals:
- Materials. All commercially available starting materials were used without further purification unless otherwise stated. 4,4-Difluoro-5,7-Dimethyl-4-Bora-3a,4a-Diaza-s-Indacene-3-Propionic Acid (BODIPY FL) was obtained from Thermo Fisher Scientific. Aromatic aldehydes were purchased from Thermo Fisher Scientific and Sigma-Aldrich. 2-Chlorotrityl chloride polystyrene (CTC—PS) 100-200 mesh resin was purchased from EMD-Millipore. ACN and water for HPLC and LC/MS were purchased from Thermo Fisher Scientific at LC/MS purity grade.
- General Instruments. Synthesized sample purification was performed with an Agilent 1260 Infinity HPLC utilizing a C18 column (150mm×21.2 mm). MS (HRMS, ESI) spectra data was collected with an Agilent 6244 TOF LC/MS with diode array detector VL+ and C18 column (4.6 mm×50 mm). Absorbance and fluorescence data were measured on a SpectraMax M5 Microplate reader. NMR spectra, 1H and 13C, were recorded on a Bruker ARK400 spectrometer. BAA microscopy screening in cells for organelle specificity and signal-to-background ratio was completed with an Axio Zeiss Light Microscope and 63× oil immersion objective.
- General Procedure for the Synthesis of BAA Fluorophore Library BODIPY FL was loaded onto CTC—PS resin in the following increments: 500 mg of BODIPY FL in 17.2 ml of DCM added to 5 g of CTC—PS resin in 14.9 ml of DIEA, protected from light on shaker overnight, washed 3× DCM, 3× DMF, 3× MeOH, 3× DMF, 3× DMC and dried with ethyl ether, resulting in 90% BODIPY FL retained on resin. BODIPY FL loaded CTC—PS resin (100 mg in 3 ml of 1:1 DMOS:ACN) and 15 equiv aldehyde (0.45 mmol in 1 ml 1:1 DMSO:ACN) were mixed with 65 equivalent acetic acid (105 pl, 2 mmol) and 65 equivalent pyrrolidine (150 pl, 2 mmol) at 85° C. for 15 min. The resin was washed 3× (3× DMC, 3× DMF), 3× ethyl ether before cleaving the formed BAA compound with 0.5% TFA in DCM. The BAA compounds were purified via HPLC and dried with Labconco freeze dryer.
- Characterization of BAA Library. All BAA compounds were characterized by LC/MS for m/z ratio and purity. Marvin Sketch was used for chemical characterization of structures. Molecular orbital calculations were performed using the density functional theory (DFT) at B3LYP/6-31G level. The six BAA compounds selected for CLSM imaging were characterized further by 1H and 13C NMR (See Supporting Information).
- Fluorescence Properties and Quantum Yield Measurements. Spectroscopic characterizations were performed in anhydrous DMSO in polystyrene 96 well plate. Analysis included the maximum absorbance wavelength, maximum fluorescence emission wavelength, full-width-at half max, and quantum yield. Quantum yields (φfl) were determined by comparing the area under the emission spectrum of the BAA compound to a reference fluorophore solution at three concentrations using equation 1, where Grad represents the gradient from the plots of integrated fluorescence intensity vs absorbance at three concentrations and q is the refractive index of the solvent. Fluorescein in 0.1 M NaOH (φfl=0.91)3 was the reference for samples with a max absorbance up to 510 nm, where an excitation of 470 nm was used with the emission integrated between 490 to 800 nm. Rhodamine B in ethanol (φfl=0.70) was the reference for samples with a max absorbance between 511-595 nm, where an excitation of 525 nm was used with the emission integrated between 545 to 800 nm. Cresyl violet in methanol (φfl=0.54)4 was the reference for samples with a max absorbance above 595 nm, where an excitation of 570 nm was used with the emission integrated between 590 to 800 nm.
-
- Cell Culture. U2OS cells were cultured in Dulbecco's Modified Eagle Medium without phenol red (Invitrogen) supplemented with 10% fetal bovine serum and 1% Penicillin-Streptomycin-Glutamine at 37° C. and 5% CO2. Cells were plated in a 96-well glass bottom plate and incubated for 3 days to reach 50% confluency.
- Microscopy Screening for Organelle Specificity in Cells. Cells were preextracted with 0.5% Triton X-100 in PBS for 20 s, fixed with 0.4% glutaldehyde (GA, Electron Microscopy Science) and 0.25% Triton X-100 in PBS for 90 s, and washed with PBS before fixing with 3% GA in PBS for 15 min. Cells were washed with PBS (3×5 min), reduced with 10 mM sodium borohydride for 10 min, washed again with PBS (3×5 min), and blocked with 5% bovine serum albumin (BSA) in PBS for 10 min. BAA compounds were diluted to 10 pM in PBS for organelle screening and incubated with permeabilized fixed cells for 5 min, washed with PBS and imaged at 60× magnification.
- The following are incorporated by reference herein:
-
- a. Demas J N and Crosby G A, J Phys Chem 75, 991 (1971);
- b. Douglas M and Brannon J H, J Phys Chem 83, 696 (1979);
- c. Karstens T and Kobs K J, J Phys Chem 84, 1871 (1980).
- As will be understood by one of ordinary skill in the art, each embodiment disclosed herein can comprise, consist essentially of or consist of its particular stated element, step, ingredient or component. Thus, the terms “include” or “including” should be interpreted to recite: “comprise, consist of, or consist essentially of.” The transition term “comprise” or “comprises” means includes, but is not limited to, and allows for the inclusion of unspecified elements, steps, ingredients, or components, even in major amounts. The transitional phrase “consisting of” excludes any element, step, ingredient or component not specified. The transition phrase “consisting essentially of” limits the scope of the embodiment to the specified elements, steps, ingredients or components and to those that do not materially affect the embodiment.
- Unless otherwise indicated, all numbers expressing quantities of ingredients, properties such as molecular weight, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term “about.” Accordingly, unless indicated to the contrary, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. When further clarity is required, the term “about” has the meaning reasonably ascribed to it by a person skilled in the art when used in conjunction with a stated numerical value or range, i.e. denoting somewhat more or somewhat less than the stated value or range, to within a range of ±10% of the stated value; ±9% of the stated value; ±8% of the stated value; ±7% of the stated value; ±6% of the stated value; ±5% of the stated value; ±4% of the stated value; ±3% of the stated value; ±2% of the stated value; or ±1% of the stated value.
- Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
- The terms “a,” “an,” “the” and similar referents used in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. Recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
- Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member may be referred to and claimed individually or in any combination with other members of the group or other elements found herein. It is anticipated that one or more members of a group may be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is deemed to contain the group as modified thus fulfilling the written description of all Markush groups used in the appended claims.
- Certain embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Of course, variations on these described embodiments will become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventor expects skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
- In closing, it is to be understood that the embodiments of the invention disclosed herein are illustrative of the principles of the present invention. Other modifications that may be employed are within the scope of the invention. Thus, by way of example, but not of limitation, alternative configurations of the present invention may be utilized in accordance with the teachings herein. Accordingly, the present invention is not limited to that precisely as shown and described.
- The particulars shown herein are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of various embodiments of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the invention, the description taken with the drawings and/or examples making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.
- Definitions and explanations used in the present disclosure are meant and intended to be controlling in any future construction unless clearly and unambiguously modified in the following examples or when application of the meaning renders any construction meaningless or essentially meaningless. In cases where the construction of the term would render it meaningless or essentially meaningless, the definition should be taken from Webster's Dictionary, 3rd Edition or a dictionary known to those of ordinary skill in the art, such as the Oxford Dictionary of Biochemistry and Molecular Biology (Ed. Anthony Smith, Oxford University Press, Oxford, 2004).
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