Dichloromethane → Tert-butyl 4-(3-amino-6-(1,4-dioxaspiro[4.5]dec-7-en-8-yl)pyrazin-2-yl)-2-fluorobenzoate

Participants

Reaction Conditions

Reaction Steps

To tert-butyl 4-(3-amino-6-bromopyrazin-2-yl)-2-fluorobenzoate (5.17 g, 46.2 mmol) in DME (115 mL) were added 4,4,5,5-tetramethyl-2-(1,4-dioxaspiro[4.5]dec-7-en-8-yl)-1,3,2-dioxaborolane (15.36 g, 57.7 mmol), PdCl2(dppf).CH2Cl2 adduct (1.885 g, 2.309 mmol), and then 2 M aqueous solution sodium carbonate (19.57 g, 185 mmol). The reaction mixture was heated at 100° C. overnight. LCMS indicated the reaction was completed. The reaction was cooled down. To the mixture was added 1000 mL of EtOAc and 300 mL of water. The resulting mixture was stirred for 30 min, and the organic layer was separated. The aqueous layer was extracted with EtOAc (3×200 mL). The organic layers were combined, washed with water three times and brine, dried over sodium sulfate, filtered off, and concentrated in vacuo. The crude product was triturated by ether to provide tert-butyl 4-(3-amino-6-(1,4-dioxaspiro[4.5]dec-7-en-8-yl)pyrazin-2-yl)-2-fluorobenzoate (19.5 g, 45.6 mmol, 99%) as a light yellow solid. LCMS (m/z): 428.1 (MH+), 1.02 min.

Provenance & Evidence