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Tion was stirred for five h at space temperature. Then, ethyl trifluoroacetate
Tion was stirred for 5 h at area temperature. Then, ethyl trifluoroacetate (1065 mg [0.89 mL], seven.5 mmol) and triethylamine (770 mg [1.06 mL], seven.six mmol) were added and stirring was continued overnight. The response mixture was evaporated as well as crude solution was purified by column chromatography on SiO2 with CH2Cl2CH3OH, one hundred:0 to 95:five. Yield: 315 mg of 4 as being a white foam (= 61 ). TLC (CH2Cl2 CH3OH = 955): Rf = 0.four. 1H NMR (300 MHz, CDCl3): 2.85 (d, J =8.seven Hz, 1H, HO-C(3)); three.50-3.65 (m, 4H, H1- C(5), H2-C(five), H1-C(two), H2-C(two)); 3.79 (s, 6H, H3CO); three.93-4.05 (m, 4H, H-C(2), H-C(four), H1-C(1), H2-C(1)), 4.42 (m, 1H, H-C(3)); five.33 (d, J =8.1 Hz, 1H, H-C(5)); 5.86 (s, 1H, H-C(1)); six.85 (m, 4H, H-C(ar)); seven.24-7.39 (m, 9H, H-C(ar)); 7.71 (m, 1H, Claudin-18/CLDN18.2 Protein Storage & Stability HNCOCF3); 8.05 (d, J =8.one Hz, 1H, H-C(6)); 9.95 (s, 1H, N-H) ppm. 13C NMR (150 MHz, CDCl3): 39.75 (C(2)); fifty five.39 (CH3O); 61.08 (C(5)); 68.55 (C(three)); 69.37 (C(one); 83.36 (C(two); 83.49 (C(four)); 87.thirty; 87.33 (C(one)); 102.61 (C(five)); 113.48 (C(ar)); 127.36 (C(ar)); 130.22 (C(ar)); 135.38; 135.36; 140.01 (C(6)); 144.43; 151.13; 158.87; 158.91; 163.48 ppm. ESI-MS (mz): [MNa] calcd for C32H33N5O8Na, 708.28; observed 708.21.dx.doi.org10.1021bc400513z | Bioconjugate Chem. 2014, 25, 188-Bioconjugate Chemistry RNA Solid-Phase Synthesis. Typical phosphoramidite chemistry was applied for RNA strand elongation applying reliable help 3: for that synthesis 2-O-TOM normal RNA nucleoside phosphoramidite creating blocks were obtained from GlenResearch and ChemGenes, the polystyrene support from GE Healthcare (Custom Primer Help, 80 molg; PS 200). All oligonucleotides were synthesized on a ABI 392 Nucleic Acid Synthesizer following conventional solutions: detritylation (80 s) with dichloroacetic acid1,2-dichloroethane (four 96); coupling (two.0 min) with IL-8/CXCL8 Protein Molecular Weight phosphoramiditesacetonitrile (0.1 M 130 L) and benzylthiotetrazoleacetonitrile (0.3 M 360 L); capping (three 0.4 min, Cap ACap B = eleven) with Cap A: 4-(dimethylamino)pyridine in acetonitrile (0.5 M) and Cap B: Ac2Osym-collidineacetonitrile (235); oxidation (one.0 min) with I2 (20 mM) in THFpyridineH2O (35105). The solutions of amidites and tetrazole, and acetonitrile were dried in excess of activated molecular sieves (four overnight. Deprotection of 2-O-(2-azidoethyl) Modified RNA. The solid support was handled with MeNH2 in EtOH (33 , 0.5 mL) and MeNH2 in water (40 , 0.five mL) for seven h at area temperature. (For RNA containing 5-aminoallyl uridines, the column was first treated with 10 diethylamine in acetonitrile (twenty mL), washed with acetonitrile (twenty mL) and dried. Then, the solid help was handled with MeNH2 in EtOH (33 , one mL) and NH3 in H2O (28 , 1 mL) for 10 min at area temperature and twenty min at 65 .) The supernatant was eliminated from and also the solid support was washed three times with ethanolwater (11, vv). The supernatant and the washings have been combined with all the deprotection solution of your residue and the entire mixture was evaporated to dryness. To eliminate the 2-silyl protecting groups, the resulting residue was handled with tetrabutylammonium fluoride trihydrate (TBAF3H2O) in THF (1 M, one mL) at 37 overnight. The reaction was quenched from the addition of triethylammonium acetate (TEAA) (1 M, pH seven.4, 1 mL). The volume in the resolution was decreased and also the solution was desalted that has a size exclusion column (GE Healthcare, HiPrep 2610 Desalting; two.six 10 cm; Sephadex G25) eluating with H2O; the collected fraction was evaporated to dryness and dissolved in one mL H2O. Analysis of your crude RNA after deprotectio.