HOAt → tert-butyl (3s)-3-(n-[(1S)-1-[(4-chlorophenyl)methyl]-2-(4-{2-[(methylsulfonyl)amino]phenyl}piperazinyl)-2-oxoethyl]carbamoyl)-1,2,3,4-tetrahydroisoquinoline-2-carboxylate

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Reaction Steps

tert-Butyl (3S)-3-(N-[(1S)-1-[(4-chlorophenyl)methyl]-2-(4-{2-[(methylsulfonyl)amino]phenyl}piperazinyl)-2-oxoethyl]carbamoyl)-1,2,3,4-tetrahydroisoquinoline-2-carboxylate was prepared from (2S)-2-amino-3-(4-chlorophenyl)-1-(4-{2-[(methylsulfonyl)amino]phenyl}-piperazinyl)propan-1-one (Step 2) (380 mg, 0.87 mmol), according to the procedure for Preparation XIX using Boc-L-Tic-OH (250 mg, 0.91 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide methiodide (540 mg, 1.8 mmol), HOAT (140 mg, 1.0 mmol), and DMF (25 mL). Crude material was obtained in a quantitative yield and used without further purification. MS (ESI, pos. ion) m/z: 696 (M+H), (ESI, neg. ion) m/z: 694 (M−H). Calc'd for C35H42ClN5O6S: 695.25.

Provenance & Evidence