Sodium Carbonate → (rac.)-(1R*,5S*)-7-{6-[3-(2-Chloro-3,6-difluoro-phenyl)-isoxazol-5-ylmethoxy]-pyridin-3-yl}-9-methyl-3,9-diaza-bicyclo[3.3.1]non-6-ene-3,6-dicarboxylic Acid 3-tert-butyl Ester 6-ethyl Ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

(rac.)-(1R*,5S*)-9-Methyl-7-trifluoromethanesulfonyloxy-3,9-diaza-bicyclo[3.3.1]non-6-ene-3,6-dicarboxylic acid 3-tert-butyl ester 6-ethyl ester (WO 2003/093267; 1.00 g, 2.18 mmol) and 2-[3-(2-chloro-3,6-difluoro-phenyl)-isoxazol-5-ylmethoxy]-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyridine (1.41 g, 3.27 mmol) were dissolved in DME (14.5 mL), and aq. 2M Na2CO3 (11.0 mL) was added. The mixture was degassed with N2 (5 min). Pd(PPh3)4 (126 mg, 0.109 mmol) was added, and the mixture was rapidly heated to 80° C. The mixture was stirred at this temperature for 1 h, and was allowed to cool to rt. The mixture was diluted with EtOAc (100 mL), and was washed with water (100 mL). The org. layer was dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Purification of the crude by FC(CH2Cl2/MeOH 95:5) yielded the title compound (1.12 g, 81%). LC-MS: tR=0.91 min; ES+: 631.34.

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