Structure of 4-Iodopyridine
CAS No.: 15854-87-2
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Jacob Silzel ; Chengwei Chen ; Colomba Sanchez-Marsetti ; Phillip Farias ; Veronica Carta ; W. Hill Harman , et al.
Abstract: Cysteine is the most reactive naturally occurring amino acid due to the presence of a free thiol, presenting a tantalizing handle for covalent modification of peptides/proteins. Although many mass spectrometry experiments could benefit from site-specific modification of Cys, the utility of direct arylation has not been thoroughly explored. Recently, Spokoyny and coworkers reported a Au(III) organometallic reagent that robustly arylates Cys and tolerates a wide variety of solvents and conditions. Given the chromophoric nature of aryl groups and the known susceptibility of carbon-sulfur bonds to photodissociation, we set out to identify an aryl group that could efficiently cleave Cys carbon-sulfur bonds at 266 nm. A streamlined workflow was developed to facilitate rapid examination of a large number of aryls with minimal sample using a simple test peptide, RAAACGVLK. We were able to identify several aryl groups that yield abundant homolytic photodissociation of the adjacent Cys carbon-sulfur bonds with short activation times (<10 ms). In addition, we characterized the radical products created by photodissociation by subjecting the product ions to further collisional activation. Finally, we tested Cys arylation with human hemoglobin, identified reaction conditions that facilitate efficient modification of intact proteins, and evaluated the photochemistry and activation of these large radical ions.
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Keywords: Fragmentation ; photodissociation ; radical-directed dissociation ; cysteine modification
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Purchased from AmBeed: 15854-87-2 ; 615-43-0 ; 5029-67-4 ; 1120-90-7 ; 540-37-4
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CAS No. : | 15854-87-2 |
Formula : | C5H4IN |
M.W : | 205.00 |
SMILES Code : | IC1=CC=NC=C1 |
MDL No. : | MFCD02093937 |
InChI Key : | RTLUPHDWSUGAOS-UHFFFAOYSA-N |
Pubchem ID : | 609492 |
GHS Pictogram: | ![]() |
Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
Num. heavy atoms | 7 |
Num. arom. heavy atoms | 6 |
Fraction Csp3 | 0.0 |
Num. rotatable bonds | 0 |
Num. H-bond acceptors | 1.0 |
Num. H-bond donors | 0.0 |
Molar Refractivity | 36.95 |
TPSA ? Topological Polar Surface Area: Calculated from | 12.89 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from | 1.56 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by | 1.51 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from | 1.69 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from | 1.41 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by | 2.47 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions | 1.73 |
Log S (ESOL):? ESOL: Topological method implemented from | -2.7 |
Solubility | 0.412 mg/ml ; 0.00201 mol/l |
Class? Solubility class: Log S scale | Soluble |
Log S (Ali)? Ali: Topological method implemented from | -1.39 |
Solubility | 8.37 mg/ml ; 0.0408 mol/l |
Class? Solubility class: Log S scale | Very soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by | -2.98 |
Solubility | 0.215 mg/ml ; 0.00105 mol/l |
Class? Solubility class: Log S scale | Soluble |
GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg | High |
BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg | Yes |
P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) | No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) | Yes |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) | No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) | No |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) | No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) | No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from | -6.48 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from | 0.0 |
Ghose? Ghose filter: implemented from | None |
Veber? Veber (GSK) filter: implemented from | 0.0 |
Egan? Egan (Pharmacia) filter: implemented from | 0.0 |
Muegge? Muegge (Bayer) filter: implemented from | 1.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat | 0.55 |
PAINS? Pan Assay Interference Structures: implemented from | 0.0 alert |
Brenk? Structural Alert: implemented from | 1.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from | No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) | 1.58 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | With potassium phosphate; In dimethyl sulfoxide; at 80℃; for 5h;Inert atmosphere; | General procedure: An oven dried two-necked round bottom flask was charged with aryl halide (1mmol) and K3PO4 (2mmol), evacuated, and backfilled with argon. The azole compound (1mmol) and 2mL of DMSO were added under argon. After that Cu-NP (1.6mmol) was added and the flask was again backfilled with argon. The flask was then immersed in a preheated oil bath at 80C until the conversion was completed (detected by TLC). The cooled mixture was partitioned between ethyl acetate (10mL) and saturated NH4Cl (10mL). The aqueous layer was extracted with ethyl acetate (2×10mL), the organic layer was washed with brine (20mL), dried over anhydrous Na2SO4, and concentrated in vacuum. The residue was purified by column chromatography on silica gel using ethyl acetate in hexane (1.5-10%) as eluent to afford the desired product. All the products have been characterized by 1H NMR, 13C NMR, and mass spectroscopy. For new products, FTIR data were also recorded.Analytical data of compound 3a: 1H NMR (CDCl3, 500MHz): δ 7.94 (d, J=8.5Hz, 2H), 7.87 (d, J=8.5Hz, 2H), 7.78 (d, J=8.5Hz, 1H), 7.70-7.68 (m, 2H), 7.27-7.24 (m, 1H), 7.20-7.17 (m, 1H), 6.79 (d, J=3.5Hz, 1H); 13C NMR (CDCl3, 125MHz): δ 142.8, 135.5, 129.7, 128.3, 127.4, 126.9 (q, J=59Hz), 125.4 (q, J=362Hz), 123.9, 122.9, 121.4, 121.0, 110.3, 104.9; MS(EI) 262.4 (M+). Anal. Calcd for C15H10F3N: C, 68.96, H, 3.86, N, 5.36. Found: C, 68.89, H, 3.88, N, 5.33. |
90% | With potassium phosphate; copper; In dimethyl sulfoxide; at 80℃; for 5h;Inert atmosphere; | General procedure: An oven dried two-necked round bottom flask was charged with aryl halide (1mmol) and K3PO4 (2mmol), evacuated, and backfilled with argon. The azole compound (1mmol) and 2mL of DMSO were added under argon. After that Cu-NP (1.6mmol) was added and the flask was again backfilled with argon. The flask was then immersed in a preheated oil bath at 80C until the conversion was completed (detected by TLC). The cooled mixture was partitioned between ethyl acetate (10mL) and saturated NH4Cl (10mL). The aqueous layer was extracted with ethyl acetate (2×10mL), the organic layer was washed with brine (20mL), dried over anhydrous Na2SO4, and concentrated in vacuum. The residue was purified by column chromatography on silica gel using ethyl acetate in hexane (1.5-10%) as eluent to afford the desired product. All the products have been characterized by 1H NMR, 13C NMR, and mass spectroscopy. For new products, FTIR data were also recorded. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
102 g | 4-iodoyridine 149g and THF 689mL flown into a flask, the temperature of the contents kept 1 °C, 2.0M isopropylmagnesium chloride THF soln. 400 ml is dropwise added. after dropwise addition 15 minutes stirred, tetramethylethylenediaminezinc(II) chloride complex 202g is added, with stirring, 25 minutes at room temperature. Next, p-bromoiodobenzene 226g and tetrakis(triphenylphosphine)palladium(0) 0.34g was added and heated to reflux for 3 hours. The reaction liquid cooling to room temperature, sodium salt aqueous acetic acid ethylenediaminediacetic 4 · 4 (730g/1.7L) is added, the organic layer. After intercalating organic layer is dried by a drying agent, distilling the crude product is obtained and the solvent is reduced. This crude product is silica gel column chromatography (developing solvent: toluene-toluene/ethyl acetate = 9/1 (volume ratio)) is purified by, 4-(4-bromophenyl)pyridine 102g is obtained. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | General procedure: The appropriate mono-, di- or tri-acetylene TPA derivative(200 mg) and 4-iodopyridine were dissolved in a mixture ofdioxane/piperidine (25 mL, 4/1). Ar was bubbled through themixture for 10 min and [Pd(PPh3)4] and CuI were added. The reactionmixture was stirred at 90 C for 12 h. The cooled reactionmixture was diluted with H2O (50 mL) and extracted with CH2Cl2(2 50 mL). The combined organic extracts were thenwashed withsaturated NH4Cl solution, brine, and dried. Finally, the solventswere evaporated under vacuum and the crude productwas purifiedby column chromatography (SiO2, appropriate eluent). |
Tags: 15854-87-2 synthesis path| 15854-87-2 SDS| 15854-87-2 COA| 15854-87-2 purity| 15854-87-2 application| 15854-87-2 NMR| 15854-87-2 COA| 15854-87-2 structure
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