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ethyl 5-(3-chlorophenyl)-1H-pyrazole-3-carboxylate[ No CAS ]
[ 595610-50-7 ]
Yield
Reaction Conditions
Operation in experiment
47.9%
With water; for 8.0h;Alkaline conditions;
General procedure: To a solution of compound 29b (2.6 g, 9.1 mmol) in MeOH(30 mL) and H2O (15 mL) was added LiOHH2O (0.5 g, 20.0 mmol) and the mixture was stirred at70 C for 8 h. The reaction mixture was evaporated and H2O (15 mL) was added, then acidified byhydrochloric acid (1 M) to pH 3. The suspension was filtered and washed by H2O (10 mL), driedat 50 C for 4 h to afford 11b as a white solid (2.1g, 89.5% yield),
(S)-methyl 4-(2-(5-(3-chlorophenyl)-1H-pyrazole-3-carboxamido)-3-phenylpropanamido)benzoate[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; In N,N-dimethyl-formamide; at 20.0℃; for 0.166667h;
To amixture of 3-(3-chlorophenyl)-1H-pyrazole-5-carboxylic acid (14a, 133 mg, 0.60 mmol) inDMF(4 mL)was added (S)-methyl-4-(2-amino-3-phenylpropanamido)benzoate hydrochloride (12, 200 mg,0.60 mmol), N,N-diisopropyl-ethylamine (232 mg, 1.80 mmol), 1-hydroxybenzotriazole(161 mg,1.20 mmol) and N-(3-dimethylaminopropyl)-N0-ethylcarbodiimide hydrochloride (229 mg, 1.20 mmol)and the reaction mixture was stirred at room temperature overnight.Then TLC analysis indicatedreaction was complete, and H2O (40 mL) was added.The mixture was stirred for 10 min and filtered toget crude product 13a as a yellow solid, which was used for next step without further purification.
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