CC(C)([O-])C.[K+].[CH:7]([C:10]1[N:11]=[C:12]([C:15]([NH:17][C:18]2[C:23]([CH3:24])=[C:22]([O:25][CH3:26])[CH:21]=[CH:20][C:19]=2[C:27](=[O:29])[CH3:28])=O)[S:13][CH:14]=1)([CH3:9])[CH3:8].O.Cl>C(O)(C)(C)C.CCOCC>[OH:29][C:27]1[C:19]2[C:18](=[C:23]([CH3:24])[C:22]([O:25][CH3:26])=[CH:21][CH:20]=2)[N:17]=[C:15]([C:12]2[S:13][CH:14]=[C:10]([CH:7]([CH3:9])[CH3:8])[N:11]=2)[CH:28]=1Potassium tert-butoxide (21.8 g, 195 mmol) was added to a suspension of 2′-[[(4-iso-propylthiazole-2-yl)(oxo)methyl]amino]-4′-methoxy-3′-methylacetophenone (35, 30.8 g, 92.7 mmol) in tert-butanol. The resulting reaction mixtures was heated at 100° C. overnight. Then, the reaction mixture was cooled at room temperature and diluted with ether (100 mL). The precipitate was filtered off and washed with Et2O to give a powder (fraction A). The mother liquor was concentrated in vacuo, triturated in ether, filtered off, and washed with ether to give a powder (fraction 2). Fractions 1 and 2 were mixed and poured into water (250 mL). The pH of the resulting solution was adjusted to 6-7 (control with pH paper) with HCl 1N. The precipitate was filtered off, washed with water and dried. Then, the solid was triturated in diisopropyl ether, filtered off and dried to give 26 g (88%) of the title product 36 as a brownish solid: m/z=315 (M+H)+.
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