| 88% |
With hydrogenchloride In ethanol; water for 1h; Reflux; |
3.G Step G. 4’-[(2-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl]-N-(4,5-dimethyl-3-isoxazolyl)-2’-(ethoxymethyl)[1,1’-biphenyl]-2-sulfonamide
Step G. 4'-[(2-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl]-N-(4,5-dimethyl-3-isoxazolyl)-2'-(ethoxymethyl) [1,1'-biphenyl]-2-sulfonamide The MOM protecting group of 4'-[(2-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl]-N-(4,5-dimethyl-3-isoxazolyl)-2'-(ethoxymethyl)-N-(methoxymethyl) [1,1'-biphenyl]-2-sulfonamide (32 g, 53 mmol.) was removed according to General Method 6. The crude product was purified by silica gel chromatography using hexanes/ethyl acetate/acetic acid as eluant to provide the title compound (26 g, 88%) as an amorphous foam: MS n/e 593 (ESI+ mode); HPLC retention time 18.75 min (HPLC method E); HPLC purity>96%. [0157] To a 0.1 M solution of a SEM- or MEM-protected N-heteroaryl sulfonamide in one volume of 95% EtOH wasadded an equal volume of 6N aqueous HCl, and the resulting solution was heated at reflux for 1 h. The reaction mixturewas concentrated and the pH of the solution was adjusted to pH 8 using aqueous sodium bicarbonate solution. It wasthen reacidified to pH 5 with glacial acetic acid. The mixture was extracted with three portions of ethyl acetate. Thecombined organic extracts were washed with water and brine, dried over sodium sulfate, and concentrated. The residuewas purified by reverse-phase preparative HPLC, or by silica gel chromatography using chloroform/methanol or hexanes/acetone as eluant. |
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Stage #1: 4'-[(2-butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl-N-](4,5-dimethyl-3-isoxazolyl)-2'-(ethoxymethyl)-N-(methoxymethyl) [1,1'-biphenyl]-2-sulfonamide With hydrogenchloride In ethanol; water at 75 - 80℃; for 2h;
Stage #2: With sodium hydroxide In ethanol; water at 20℃; |
11
Example 11; N-(3,4-Dimethyl-5-isoxazolyl)-2-(4-(2-butyl-4-oxo-l,3-diazospiro[4.4]non-l-en- 3yl)methyl-2-ethoxymethylphenyl)phenylsulfonamide (Compound 1); [0067] To a suspension of l-bromo-4-((2-butyl-4-oxo-l,3-diazaspiro[4.4]non- l-en-3-yl)methyl)-2-ethoxymethylbenzene bisoxalic acid salt (Compound 19) (5.0 g, 8.3 mmol) in toluene (20 niL) under nitrogen was added water (30 mL) and pH was adjusted to 8-9 by addition of a 2 M NaOH solution at room temperature. The organic phase was separated and mixed with 2-(N-(3,4-dimethyl-5-isoxazolyl)-N- methoxymethylamino)sulfonylphenylboronic acid pinacol ester (Scheme VII, Formula IX, where R8 is methoxymethyl and M = boronic acid pinacol ester) (3.6 g, 8.5 mmol), bis(dibenzylideneacetone)palladium(0) (Pd(dba)2) (0.12 g), and a standard phosphine ligand. After a 2 M sodium carbonate solution was added, the reaction mixture was warmed to 70 0C and stirred until the reaction was complete by HPLC analysis. The reaction was cooled to room temperature and quenched with water, and then separated in phases. The organic phase was treated with activated carbon, filtered through a pad of silica gel, and was concentrated to afford a crude mixture.[0068] The crude reaction mixture was dissolved in ethanol (40 mL) after palladium catalyst was removed and was treated with 6 M HCl solution (ca. 40 mL). The mixture was warmed to 75-80 °C and stirred for about 2 hours until the reaction was completed by HPLC analysis. After the mixture was cooled to room temperature, the pH of the mixture was adjusted to 8 by addition of 10 M NaOH solution. The mixture was stirred for 2 more hours and the pH was adjusted to 6 by adding 2 M HCl and the crystal seeds. Filtration of the crystalline solid followed by drying provided N-(3,4-dimethyl-5- isoxazolyl)-2-(4-(2-butyl-4-oxo-l,3-diazospiro[4.4]non-l-en-3yl)methyl-2- ethoxymethylphenyl)phenylsulfonamide (Compound 1) as a white solid. 1H NMR (400 MHz, CDCIa) 8.03 (dd, J= 8.0 and 1.2, IH), 7.60 (td, J = 7.5 and 1.5, IH), 7.50 (td, J = 7.7 and 1.5, IH), 7.36 (s, IH), 7.28 (d, J= 2.1, 1 H), 7.25 (dd, J = 7.5 and 1.2, IH), 7.09 (dd, J= 7.9 and 1.6, IH), 6.61 (bs, IH), 4.77 (AB quartet, J= 15.5 and 8.1, 2H), 4.18 (AB quartet, J= 12.0 and 35, 2H), 3.45-3.32 (m, 2H), 2.39 (t, J= 7.5, 2H), 2.26 (s, 3H), 2.02- 1.84 (m, 8H), 1.82 (s, 3H), 1.63 (quint, J= 7.5, 2H), 1.37 (sextet, J= 7.3, 2H), 1.07 (t, J = 7.0, 3H), and 0.90 (t J= 7.3, 3H). |
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