双二氯甲基二甲基硅烷

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of (R)-2-isopropyl-3,6-dimethoxy-2,5-dihydro-pyrazine (7.0 g, 38 mmol), bis(chloromethyl)dimethylsilane (6.0 g, 38 mmol) in THF (150 mL) was added n-butyl-lithium (20 mL, 50 mmol) at −65 to −75° C. dropwise. The mixture was allowed to gradually warm to RT overnight. An ammonium chloride solution at 0° C. was added and the reaction mixture was extracted with EtOAc. The organic layer was washed with water and brine, dried over Na2SO4, concentrated, and purified by silica gel chromatography (2% EtOAc in petroleum ether) to give the title intermediate (5 g, 44% yield) as a clear oil 1H NMR: (MeOD, 400 MHz) δ (ppm): 4.15 (m, 1H), 3.99 (m, 1H), 3.72 (m, 6H), 2.95 (m, 2H), 2.30 (m, 1H), 1.45 (m, 1H), 1.08 (m, 4H), 0.75 (m, 3H), 0.26 (s, 6H). the reaction mixture was extracted with EtOAc The organic layer was washed with water and brine dried over Na2SO4 concentrated purified by silica gel chromatography (2% EtOAc in petroleum ether)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of (R)-2-isopropyl-3,6-dimethoxy-2,5-dihydro-pyrazine (7.0 g, 38 mmol), bis(chloromethyl)dimethylsilane (6.0 g, 38 mmol) in THF (150 mL) was added n-butyl-lithium (20 mL, 50 mmol) at −65 to −75° C. dropwise. The mixture was allowed to gradually warm to RT overnight. An ammonium chloride solution at 0° C. was added and the reaction mixture was extracted with EtOAc. The organic layer was washed with water and brine, dried over Na2SO4, concentrated, and purified by silica gel chromatography (2% EtOAc in petroleum ether) to give the title intermediate (5 g, 44% yield) as a clear oil 1H NMR: (MeOD, 400 MHz) δ (ppm): 4.15 (m, 1H), 3.99 (m, 1H), 3.72 (m, 6H), 2.95 (m, 2H), 2.30 (m, 1H), 1.45 (m, 1H), 1.08 (m, 4H), 0.75 (m, 3H), 0.26 (s, 6H). the reaction mixture was extracted with EtOAc The organic layer was washed with water and brine dried over Na2SO4 concentrated purified by silica gel chromatography (2% EtOAc in petroleum ether)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of (R)-2-isopropyl-3,6-dimethoxy-2,5-dihydro-pyrazine (7.0 g, 38 mmol), bis(chloromethyl)dimethylsilane (6.0 g, 38 mmol) in THF (150 mL) was added n-butyl-lithium (20 mL, 50 mmol) at −65 to −75° C. dropwise. The mixture was allowed to gradually warm to RT overnight. An ammonium chloride solution at 0° C. was added and the reaction mixture was extracted with EtOAc. The organic layer was washed with water and brine, dried over Na2SO4, concentrated, and purified by silica gel chromatography (2% EtOAc in petroleum ether) to give the title intermediate (5 g, 44% yield) as a clear oil 1H NMR: (MeOD, 400 MHz) δ(ppm): 4.15 (m, 1H), 3.99 (m, 1H), 3.72 (m, 6H), 2.95 (m, 2H), 2.30 (m, 1H), 1.45 (m, 1H), 1.08 (m, 4H), 0.75 (m, 3H), 0.26 (s, 6H). the reaction mixture was extracted with EtOAc The organic layer was washed with water and brine dried over Na2SO4 concentrated purified by silica gel chromatography (2% EtOAc in petroleum ether)