Synthesis of tirofiban hydrochloride
A technology of propionate and condensation reaction, applied in the direction of organic chemistry, organic chemistry method, etc., can solve the problems of complicated reaction operation, triphenylphosphine oxide by-products, etc., and achieve the effect of simple operation
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[0032] 1. Preparation of (S)-2-(n-butylsulfonylamino)-3-(4-(4-(pyridin-4-yl) butyl oxygen) phenyl) propionic acid ethyl ester (formula III, R 1 =Et,R 2 = ).
[0033] (S)-3-(4-chlorophenyl)-2-(n-butylsulfonylamino)-propionic acid ethyl ester (139.0g, 0.40mol), 4-pyridinebutanol (181.5g, 1.20mol) , CuI (3.80g, 19.95mmol), K 3 PO 4 (127.4g, 0.60mol) and N 1 ,N 2 - bis(naphthalene-1-ylmethyl) oxalamide (14.8g, 39.96mmol) was added to the reaction flask, followed by nitrogen replacement three times, then anhydrous DMSO (500mL) was added to the reaction flask, and the reaction system was again nitrogen Replace three times. Subsequently, the reaction system was heated to 100° C. for 24 h under stirring. After the reaction was over, the system was naturally cooled to room temperature. The reaction system was diluted with ethyl acetate (1.5 L), then filtered through celite. The filtrate was desolvated under reduced pressure to remove the organic solvent. The residue was add...
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