Potassium Phosphate, Tribasic → 3-(3-(tert-butyldimethylsilyloxy)propyl)-6-(4-chlorophenyl)-5-((4-chlorophenyl)(hydroxy)methyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dione

Participants

Reaction Steps

To a solution of 3-(3-(tert-butyldimethylsilyloxy)propyl)-6-chloro-5-((4-chlorophenyl) (hydroxy)methyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dione (See Compound 49, step 4, 130 mg, 0.248 mmol), 4-chlorophenylboronic acid (77.37 mg, 0.496 mmol), NaHCO3 (62.5 mg, 0.744 mmol) and aq. 2M K3PO4 (0.62 ml, 1.24 mmol) in dioxane (1 mL) and water (0.2 mL) was added Pd(dppf)Cl2 (7 mg, 0.0096 mmol). The reaction was degassed with nitrogen (3×) and heated at 120° C. (MW) for 1.5 h, cooled to RT then diluted with EA (10 mL) and water (2 mL). The reaction was filtered and the filtrate was concentrated to a residue which was purified by Prep TLC eluted with PE/EA (2:1) to give 3-(3-(tert-butyldimethylsilyloxy)propyl)-6-(4-chlorophenyl)-5-((4-chlorophenyl)(hydroxy)methyl)-1-methylpyrido[3,4-d]pyrimidine-2,4(1H,3H)-dione (30 mg, 20% yield) as colorless oil, LCMS: MH+ 600 and TR=2.924 min.

Provenance & Evidence