反应详情

BOP coupling of (S)-3-cyclohexyl-2-(4-fluoro-1-oxo-1,3-dihydro-isoindol-2-yl)-propionic acid (ca. 1:1 mixture of regioisomers, prepared in Step C; 501 mg; 1.64 mmol) and 2-amino-5-chlorothiazole hydrochloride (643 mg; 3.64 mmol) in a manner similar to that used for the preparation of (S)-3-cyclohexyl-2-(1-oxo-1,3-dihydro-isoindol-2-yl)-N-thiazol-2-yl-propionamide as outlined in Example 9, Step B) provided after normal phase HPLC (Waters Prep. 500, loaded on column with methylene chloride, eluent: 20% ethyl acetate/hexanes) 194 mg of (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(4-fluoro-1-oxo-1,3-dihydro-isoindol-2-yl)-propionamide: EI-HRMS m/e calcd for C20H21ClFN3O2S (M+) 421.1027, found 421.1024; and 173 mg of regioisomeric (S)-N-(5-Chloro-thiazol-2-yl)-3-cyclohexyl-2-(7-fluoro-1-oxo-1,3-dihydro-isoindol-2-yl)-propionamide: EI-HRMS m/e calcd for C20H21ClFN3O2S (M+) 421.1027, found 421.1031.