Selective formation of amides or peptides with ethanol as solvent using a convenient one-pot procedure in which acid activating agent N-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride (EDC) is simply added to a mixture of the carboxylic acid, amine, catalytic HOBt (1-hydroxy benzotriazole), and NMM (Nmethylmorpholine) as base has been developed. Sensitive functionalities such as hydroxyl groups are well tolerated under the reaction conditions. In addition, isolation of products is usually by simple filtration from the reaction media. The scope and generality of this methodology was investigated.
An efficient synthesis of 4-chloro-2-pyrrolino[2,3-d]pyrimidin-6-one was achieved in four steps starting from dimethyl malonate in 23% overall yield. This synthesis was demonstrated on 100 g scale to obtain 4-chloro-2-pyrrolino[2,3-d]pyrimidin-6-one in 98.5% purity. Similarly, 7-[(2,4-dimethoxyphenyl)methyl]-4-chloro[2,3-d]pyrimidin-6-one and 7-(α-methylbenzyl)-4-chloro[2,3-d]pyrimidin-6-one were synthesized by the reaction of methyl 2-(4,6-dichloropyrimidin-5-yl)acetate with an appropriately substituted benzylamine.
A practical synthesis of the title compound was accomplished by hydrogenation of 2-{4-[4-fluoro-3-(trifluoromethyl)phenyl]-2-(pyridin-4-yl)-1H-imidazol-1-yl}-N,N-dimethylethanamine. The latter was obtained by N-alkylation of 4-{4-[4-fluoro-3-(trifluoromethyl)phenyl]-1H-imidazol-2-yl}pyridine. Treatment of N-{2-[4-fluoro-3-(trifluoromethyl)phenyl]-2-oxoethyl}isonicotinamide hydrochloride with ammonium acetate in acetic acid provided 4-{4-[4-fluoro-3-(trifluoromethyl)phenyl]-1H-imidazol-2-yl}pyridine. Coupling of 2-amino-1-[4-fluoro-3-(trifluoromethyl)phenyl]ethanone 4-methylbenzene sulfonate with pyridine 4-carboxylic acid using either T 3 P or EDCI-HOBt provided N-{2-[4-fluoro-3-(trifluoromethyl)phenyl]-2-oxoethyl}isonicotinamide hydrochloride.
Synthesis of the title compound was accomplished via coupling of (S)-alaninyl-(S)-1-amino-3-methyl-4,5,6,7-tetrahydro-2H-3-benzazepin-2-one with the activated trimethylsilyl ester of (S)-2-trimethylsilyloxy-3-methylbutyric acid, followed by deprotection and crystallization in situ. The starting material was prepared by the condensation of (S)-1-amino-3-methyl-4,5,6,7-tetrahydro-2H-3-benzazepin-2-one with activated N-(2-methoxycarbonyl-1-methylvinyl)-(S)-alanine sodium salt in the form of the mixed carboxylic carbonic anhydride, followed by enamine hydrolysis using methanesulfonic acid.
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