Thioglycolic Acid → methyl 3-[4-({4-[(3,5-diphenyl-1H-pyrazol-1-yl)methyl]benzyl}amino)phenyl]propanoate

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Reaction Steps

To a solution of methyl 3-(4-{[(2-nitrophenyl)sulfonyl]amino}phenyl)propanoate (180 mg, 0.5 mmol), {4-[(3,5-diphenyl-1H-pyrazol-1-yl)methyl]phenyl}methanol (178 mg, 0.5 mmol) and triphenylphosphine (262 mg, 1.0 mmol) in dichloromethane (5 mL) was added diethyl azodicarboxylate (40% toluene solution, 435 mg, 1.0 mmol) at room temperature, and the mixture was stirred at room temperature for 1 hr. The reaction mixture was purified by silica gel column chromatography (10%-80% ethyl acetate/hexane) to give a yellow oil. To a solution of the yellow oil and mercaptoacetic acid (100 mg, 1.1 mmol) in N,N-dimethylformamide (5 mL) was added lithium hydroxide monohydrate (80 mg, 1.9 mmol), and the mixture was stirred at room temperature for 14 hr. The reaction mixture was poured into 10% aqueous sodium hydrogencarbonate solution, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was dried using a Presep Dehydration tube (manufactured by Wako Pure Chemical Industries, Ltd.), and concentrated. The residue was purified by silica gel column chromatography (10%-80% ethyl acetate/hexane) to give the title compound (120 mg, yield 48%, 2 steps) as a yellow oil.

Provenance & Evidence