Trifluoroacetic acid → 3-Amino-1-(4-methoxy-benzenesulfonyl)-2,3,4,7-tetrahydro-1H-azepine-2-carboxylic acid tert-butyl ester

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Reaction Steps

1-(4-Methoxy-benzenesulfonyl)-3-(4-methoxybenzyloxy carbonyl-amino)-2,3,4,7-tetrahydro-1H-azepine-2-carboxylic acid tert-butyl ester (370 mg, 0.71 mMol) is dissolved in Dichloromethane (15 ml) containing 3% Trifluoroacetic Acid. The reaction is stirred for 1 h at room temperature. The solvents are evaporated and the remaining oil is co-evaporated twice with Toluene. Flash-chromatography Dichloromethane/Methanol (7:1) to afford the free amine: Cal. 546.6 found (M)+=547.

Provenance & Evidence