反应详情

温度

130 °C

A mixture of 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-[5-(N-hydroxycarbamimidoyl)-pyrazin-2-yl]-propionamide (prepared as in Example 1, 7.00 g, 15.02 mmol) in N-cyanopiperidine (25 mL) was heated at 130° C. in a sealed tube for 1.5 h. The mixture was allowed to cool to 25° C. and then concentrated under a stream of anhydrous nitrogen overnight. Flash chromatography (Merck Silica gel 60, 230–400 mesh, 3/2 ethyl acetate/hexanes) afforded the N-[5-(5-amino-[1,2,4]oxadiazol-3-yl)-pyrazin-2-yl]-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionamide (2.74 g, 37%) as an off-white solid: mp 262–264° C.; (ES)+-HRMS m/e calcd for C21H23ClN6O4S2 (M+Na)+ 513.1082, found 513.1088.

1. temperatureto cool to 25° C.
2. concentrationconcentrated under a stream of anhydrous nitrogen overnight