Reaktion #163210

Reaktionsgleichung

{4-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-cyclohexyl}-acetic acid methyl ester

5-bromo-2-chloro-pyrimidine

Na2CO3

DME

→

{4-[4-(2-chloro-pyrimidin-5-yl)-phenyl]-cyclohexyl}-acetic acid methyl ester

Lösungsmittel

EtOAc

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe mixture is sealed in a glass tube
2. 2
   Filtrationthe resulting suspension filtered
3. 3
   ExtraktionThe filtrate is extracted with 1 N HCl (25 mL)
4. 4
   Trocknenthe organic layer dried over Na2SO4
5. 5
   EinengenConcentration

Vorschrift

PdCl2dppf (120 mg, 0.140 mmol) is added to a degassed mixture of {4-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-cyclohexyl}-acetic acid methyl ester (1.00 g, 2.79 mmol), 5-bromo-2-chloro-pyrimidine (540 mg, 2.79 mmol), 2 M Na2CO3 (2.8 mL), and DME (7.5 mL). The mixture is sealed in a glass tube and heated to 120° C. for 20 min by microwave irradiation. The reaction is diluted with EtOAc (150 mL), and the resulting suspension filtered. The filtrate is extracted with 1 N HCl (25 mL) and the organic layer dried over Na2SO4. Concentration followed by silica gel chromatography (20% EtOAc/Hexanes) affords {4-[4-(2-chloro-pyrimidin-5-yl)-phenyl]-cyclohexyl}-acetic acid methyl ester as a white solid: 1H NMR (400 MHz, CHLOROFORM-d) δppm 1.14-1.27 (m, 2H) 1.49-1.61 (m, 2H) 1.86-1.98 (m, 5H) 2.28 (d, J=6.82 Hz, 2H) 2.56 (tt, J=12.22, 3.19 Hz, 1H) 3.70 (s, 3H) 7.37 (d, J=8.08 Hz, 2H) 7.49 (d, J=8.34 Hz, 2H) 8.81 (s, 2H); (M+H)+345.1.

Quelle