Reacción #89717

Ecuación de reacción

Lithium hexamethyldisilazide

1-benzyl 4-methyl(2S)-2-[benzyl((2S)-2-(1-ethoxyethoxy)-3-[(4-methylphenyl)sulfonyl]oxypropyl)amino]succinate

toluene

→

product

Rendimiento 69.9%

2-benzyl 3-methyl(2S,3S,5R)-1-benzyl-5-(1-ethoxyethoxy)piperidine-2,3-dicarboxylate

Rendimiento 69.9%

Disolventes

tetrahydrofuran

tetrahydrofuran

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturato warm up to −20 Celsius
2. 2
   workup.STIRRINGstirred at −20 Celsius for 3 h
3. 3
   OtroAfter quenched with aq ammonium chloride
4. 4
   Extracciónthe mixture was extracted with ethyl acetate
5. 5
   LavadoThe combined organic layers were washed with brine
6. 6
   Otrodried
7. 7
   Concentraciónconcentrated
8. 8
   Otroto dry
9. 9
   Lavadoeluting with 0 to 20% EtOAc in hexane

Procedimiento

To a solution of 1-benzyl 4-methyl(2S)-2-[benzyl((2S)-2-(1-ethoxyethoxy)-3-[(4-methylphenyl)sulfonyl]oxypropyl)amino]succinate (35.7 g, 0.0569 mol) in a mixture of tetrahydrofuran (95.5 mL, 1.18 mol) and toluene (490 mL, 4.6 mol) at −78 Celsius was was added 1.00 M of Lithium hexamethyldisilazide in tetrahydrofuran (68.2 mL). The reaction was stirred at −78 Celsius overnight then allowed to warm up to −20 Celsius and stirred at −20 Celsius for 3 h. After quenched with aq ammonium chloride, the mixture was extracted with ethyl acetate. The combined organic layers were washed with brine, dried and concentrated to dry. The residue was applied on silica gel column, eluting with 0 to 20% EtOAc in hexane, to afford the product (18.1 g, 69.9%). MS (ESI): (M+H)+=456.2. The corresponding diastereoisomer was also obtained (4.52 g, 17.5%).

Fuente