Trifluoroacetic acid → (2R)-(4'-Chlorobiphenyl-4-sulfonylamino)-5-(1,3-dioxo-1,3-dihydroisoindol-2-yl)pentanoic acid hydroxyamide

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Reaction Steps

A solution of the title A compound, (2R)-(4′-chlorobiphenyl-4-sulfonylamino)-5-(1,3-dioxo-1,3-dihydroisoindol-2-yl)pentanoic acid O-tritylhydroxyamide (288 mg, 0.374 mmol) in 3 mL of dichloromethane is treated sequentially with triethylsilane (0.119 mL, 0.745 mmol) and trifluoroacetic acid (0.225 mL, 2.92 mmol) at 0° C. After 10 min, the solution is concentrated at 0° C. in a stream of nitrogen, and the residue is triturated from 5 mL of diethyl ether. The product is collected by vacuum filtration and dried to give 162.3 mg (82%) of (2R)-(4′-chlorobiphenyl-4-sulfonylamino)-5-(1,3-dioxo-1,3-dihydroisoindol-2-yl)pentanoic acid hydroxyamide as a white solid: m.p. 204-206° C. (dec); NMR(DMSO-d6) 1.24-1.33 (br m, 1H), 1.37-1.50 (br m, 3H), 3.39-3.47 (m, 2H), 3.52-3.62 (m, 1H), 7.53 (d, 2H, J=8.3), 7.70 (d, 2H, J=8.3), 7.80 (br s, 8H), 8.12 (d, 1H, J=8.5), 8.82 (br s, 1H), 10.56 (s, 1H); IR 1772, 1341, 1159; ESI-MS 528 (M++1).

Provenance & Evidence