5-tri(propan-2-yl)silyloxy-1,3-diazinan-2-one

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-triisopropylsilanyloxy-propane-1,3-diamine (Step P10) (27.8 g, 113 mmol) in MeOH (450 mL) was added S,S-dimethyl carbonodithioate (17.7 mL, 169 mmol) and the mixture was stirred at 60° C. for 20 h. The reaction mixture was concentrated. The residue was purified by flash chromatography(CH2Cl2/MeOH, 100:0→5:1) to afford the title compound. ESI-MS: [M+H]+273.3 (LC-MS 1-flow injection). The reaction mixture was concentrated The residue was purified by flash chromatography(CH2Cl2/MeOH, 100:0→5:1)

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-triisopropylsilanyloxy-propane-1,3-diamine (Step P10) (27.8 g, 113 mmol) in MeOH (450 mL) was added S,S-dimethyl carbonodithioate (17.7 mL, 169 mmol) and the mixture was stirred at 60° C. for 20 h. The reaction mixture was concentrated. The residue was purified by flash chromatography(CH2Cl2/MeOH, 100:0→5:1) to afford the title compound. ESI-MS: [M+H]+273.3 (LC-MS 1-flow injection). The reaction mixture was concentrated The residue was purified by flash chromatography(CH2Cl2/MeOH, 100:0→5:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: NaH (141 mmol) was added portionwise to a solution of 5-triisopropylsilanyloxy-tetrahydro-pyrimidin-2-one (Step P9) (28.2 mmol) in DMF (200 mL) at 0° C. After 15 min, the reaction was warmed to rt. After 2 h, the mixture was cooled to 0° C., treated with methyl iodide (197 mmol) and then allowed to warm to rt overnight. The reaction mixture was quenched by addition of water and extracted with toluene. The aqueous layer was washed with EtOAc. The combined organic layers were washed with a saturated aqueous NaHCO3 solution, dried (Na2SO4), filtered, and concentrated. The residue was used without further purification. ESI-MS: tR=1.33 min, [M+H]+ 301.3 (LC-MS 1). After 2 h the mixture was cooled to 0° C. to warm to rt overnight The reaction mixture was quenched by addition of water extracted with toluene The aqueous layer was washed with EtOAc The combined organic layers were washed with a saturated aqueous NaHCO3 solution dried (Na2SO4) filtered concentrated The residue was used without further purification

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: NaH (141 mmol) was added portionwise to a solution of 5-triisopropylsilanyloxy-tetrahydro-pyrimidin-2-one (Step P9) (28.2 mmol) in DMF (200 mL) at 0° C. After 15 min, the reaction was warmed to rt. After 2 h, the mixture was cooled to 0° C., treated with methyl iodide (197 mmol) and then allowed to warm to rt overnight. The reaction mixture was quenched by addition of water and extracted with toluene. The aqueous layer was washed with EtOAc. The combined organic layers were washed with a saturated aqueous NaHCO3 solution, dried (Na2SO4), filtered, and concentrated. The residue was used without further purification. ESI-MS: tR=1.33 min, [M+H]+ 301.3 (LC-MS 1). After 2 h the mixture was cooled to 0° C. to warm to rt overnight The reaction mixture was quenched by addition of water extracted with toluene The aqueous layer was washed with EtOAc The combined organic layers were washed with a saturated aqueous NaHCO3 solution dried (Na2SO4) filtered concentrated The residue was used without further purification