Reaktion #88433

Reaktionsgleichung

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

Compound 49

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

4-chlorophenylboronic acid

NaHCO3

K3PO4

→

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

Ausbeute 20.1%

Lösungsmittel

dioxane

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction was degassed with nitrogen (3×)
2. 2
   Temperaturheated at 120° C. (MW) for 1.5 h
3. 3
   workup.ADDITIONthen diluted with EA (10 mL) and water (2 mL)
4. 4
   FiltrationThe reaction was filtered
5. 5
   Einengenthe filtrate was concentrated to a residue which
6. 6
   Sonstigewas purified by Prep TLC
7. 7
   Wascheneluted with PE/EA (2:1)

Vorschrift

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.

Quelle