反应详情

温度

80 °C

To a solution of 2-fluoro-5-chlorobenzamidine (1.95 g, 11.27 mmol, 1.1 eq) in EtOH (20 ml) was added a solution of 2-methyl-5-oxo cyclopentanecarboxylic acid ethyl ester (prepared according to Wang, C.; Gu, X.; Yu, M. S.; Curran, D. P.: Tetrahedron, 1998, 29, 8355-8370; 1.60 g, 10.26 mmol, 1 eq) in ethanol (5 ml). The reaction mixture was heated to 80° C. overnight. The reaction mixture was cooled to rt and the solvent was removed in vacuo to give a crude residue which was purified by recrystallization from hot ethyl acetate to give 2-(5-chloro-2-fluorophenyl)-5-methyl-6,7-dihydro-5H-cyclopentapyrimidin-4-ol (1.0 g, 35%) as a white crystalline solid and the filtrate was further purified by flash column chromatography to give another 850 mg of 2-(5-chloro-2-fluorophenyl)-5-methyl-6,7-dihydro-5H-cyclopentapyrimidin-4-ol.

1. temperatureThe reaction mixture was cooled to rt
2. customthe solvent was removed in vacuo
3. customto give a crude residue which
4. customwas purified by recrystallization from hot ethyl acetate