反応 #47230

反応方程式

(S)-3-cyclopentyl-2-(4-methoxy-2-oxo-2,5-dihydro-pyrrol-1-yl)-propionic acid

oxalyl chloride

5-amino-3-methyl-1,2,4-thiadiazole

2,6-lutidine

→

(S)-3-cyclopentyl-2-(4-methoxy-2-oxo-2,5-dihydro-pyrrol-1-yl)-N-(3-methyl-[1,2,4]thiadiazol-5-yl)-propionamide

溶媒

dichloromethane

methylene chloride

反応条件

後処理

1. 1
   濃縮The reaction mixture was concentrated
2. 2
   workup.DISSOLUTIONdissolved in N,N-dimethylformamide (2 mL)
3. 3
   workup.STIRRINGThe reaction mixture was stirred at 25° C., under nitrogen for 18 h
4. 4
   洗浄washed with 2N aqueous hydrochloric acid, saturated sodium chloride solution
5. 5
   その他dried
6. 6
   濃縮The organic layer was concentrated
7. 7
   その他the crude product was purified by ISCO flash chromatography (Teledyne Isco RediSep Flash Column 4 g; 0% to 35% methanol/dichloromethane)

実験手順

A solution of (S)-3-cyclopentyl-2-(4-methoxy-2-oxo-2,5-dihydro-pyrrol-1-yl)-propionic acid (prepared as in Example 1, 102 mg, 0.40 mmol) in dichloromethane (2 mL) was treated with oxalyl chloride (218 μL of 2M solution in dichloromethane), and N,N-dimethylformamide (1 drop). Effervescence was observed. The reaction mixture was stirred for 0.5 h at 25° C., under nitrogen. The reaction mixture was concentrated, and dissolved in N,N-dimethylformamide (2 mL) and treated with 5-amino-3-methyl-1,2,4-thiadiazole (48 mg, 0.41 mmol), and 2,6-lutidine (64 mg, 0.60 mmol). The reaction mixture was stirred at 25° C., under nitrogen for 18 h. The reaction mixture was diluted with methylene chloride, washed with 2N aqueous hydrochloric acid, saturated sodium chloride solution and dried. The organic layer was concentrated, and the crude product was purified by ISCO flash chromatography (Teledyne Isco RediSep Flash Column 4 g; 0% to 35% methanol/dichloromethane) to afford ((S)-3-cyclopentyl-2-(4-methoxy-2-oxo-2,5-dihydro-pyrrol-1-yl)-N-(3-methyl-[1,2,4]thiadiazol-5-yl)-propionamide (30 mg, 22% as a white powder: LR-ES-MS m/z calculated for C16H22N4O3S [M]+ 350, observed [M+H]+ 351; 1H NMR (300 MHz, CDCl3) δ ppm 0.74-0.96 (m, 1H) 1.03-1.42 (m, 3H) 1.38-2.15 (m, 7H) 2.53 (s, 3H) 3.83 (s, 3H) 3.98 (d, J=17.8 Hz, 1H) 4.13 (d, J=17.8 Hz, 1H) 5.24 (t, J=7.7 Hz, 1H) 5.38 (s, 1H).

出典