反应详情

温度

80 °C

To a stirred suspension of 6-chloro-3-(2-ethoxy-3,4-dioxo-cyclobut-1-enylamino)-2-hydroxy-N-methoxy-N-methyl-benzenesulfonamide (Intermediate A) (100 mg, 0.256 mmol) in MeCN (2 ml) and EtOH (1 ml) under N2 at RT was added (R)-(+)-alpha-ethylbenzylamine (58.8 mg, 0.435 mmol) and triethylamine (0.142 ml, 1.02 mmol) and the reaction mixture was heated at 80° C. overnight. The reaction mixture was concentrated in vacuo to give a yellow solid which was loaded onto a 1 g pre-packed silica column, dissolving in the minimal amount of 5% MeOH in DCM. Purification was carried out eluting with 10-40% EtOAc in iso-hexane and the appropriate fractions were concentrated under vacuum to give a yellow glassy solid. The solid was dissolved in EtOAc and washed four times with 1M HCl (aq). The organic portion was dried (sodium sulfate) and concentrated in vacuo to yield a brown gummy solid. Trituration with iso-hexane afford the title compound as a solid brown solid; [M+H]+ 180. 1H NMR (DMSO) 0.9 (3H, t, CH3), 1.9 (2H, m, CH2), 3.0 (3H, s, CH3), 3.6 (3H, s, CH3), 5.1 (1H, m, CH), 7.2-7.5 (6H, m, Ar—H), 8.0 (1H, d, Ar—H).

1. concentrationThe reaction mixture was concentrated in vacuo
2. customto give a yellow solid which
3. customPurification
4. washwas carried out eluting with 10-40% EtOAc in iso-hexane
5. concentrationthe appropriate fractions were concentrated under vacuum
6. customto give a yellow glassy solid
7. washwashed four times with 1M HCl (aq)
8. dry with materialThe organic portion was dried (sodium sulfate)
9. concentrationconcentrated in vacuo
10. customto yield a brown gummy solid