Reacción #1594378

Ecuación de reacción

(3,4-dimethoxyphenyl)methanamine

(R)-2-((tert-butoxycarbonyl)amino)-4-(methylthio)butanoic acid

PyBOP

DIPEA

→

(R)-tert-Butyl(1-((3,4-dimethoxybenzyl)amino)-4-(methylthio)-1-oxobutan-2-yl)carbamate

Disolventes

DCM

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe reaction was then quenched by the addition of water
2. 2
   Extracciónthe mixture was extracted twice with 100 mL DCM
3. 3
   LavadoThe organic fraction was washed with 50 mL water, 50 mL brine
4. 4
   Otrothe layers were separated
5. 5
   SecadoThe organic fraction was dried over sodium sulfate
6. 6
   Filtraciónfiltered
7. 7
   Otroevaporated
8. 8
   OtroThe residue was purified via silica gel chromatography
9. 9
   Lavadoeluting with 30% ethyl acetate/petroleum ether
10. 10
    OtroLCMS (Method F) RT 2.3 min, m/z 399.2 (MH+)

Procedimiento

To a 0° C. solution of (3,4-dimethoxyphenyl)methanamine (2 g, 12 mmol) in DCM (20 mL) was added sequentially (R)-2-((tert-butoxycarbonyl)amino)-4-(methylthio)butanoic acid (3.28 g, 13.2 mmol), PyBOP (6.85 g, 13.2 mmol) and DIPEA (4.18 mL, 23.92 mmol). The reaction mixture was stirred and allowed to warm up to ambient temperature over 2 h. The reaction was then quenched by the addition of water and the mixture was extracted twice with 100 mL DCM. The organic fraction was washed with 50 mL water, 50 mL brine, and the layers were separated. The organic fraction was dried over sodium sulfate, filtered, and evaporated. The residue was purified via silica gel chromatography, eluting with 30% ethyl acetate/petroleum ether. Yield 3.5 gms (R)-tert-butyl(1-((3,4-dimethoxybenzyl)amino)-4-(methylthio)-1-oxobutan-2-yl)carbamate. LCMS (Method F) RT 2.3 min, m/z 399.2 (MH+); 1H NMR (400 MHz, chloroform-d) δ 1.41 (s, 9H), 1.91-1.98 (m, 1H), 2.07 (s, 3H), 2.10-2.14 (m, 1H), 2.47-2.61 (m, 2H), 3.65 (s, 6H), 4.25-4.27 (br s, 1H), 4.33-4.42 (m, 2H), 5.16 (br s, 1H), 6.47 (br s, 1H), 6.80 (s, 3H).

Fuente