1-Hydroxybenzotriazole → HCID 178454208, compound

Participants

Reaction Steps

To an ice cooled solution of cis-4-(2-benzyloxy-ethylamino)-cyclohexanecarboxylic acid benzyl ester (3 g, 8.2 mmol), 4-tert-butoxycarbonylamino-4-(S)-tetrahydro-pyran-4-yl-butyric acid (2.4 g, 8.4 mmol) (prepared as in Example 35) and HOBT (2.4 g, 10.5 mmol) in CH2Cl2 (100 mL) was added TEA (2.3 mL), followed by addition of 1,3-dimethylamino propyl-3-ethylcarbodiimide (EDC, 2.0 g, 10 mmol). The reaction mixture was allowed to warm to room temperature and then was stirred overnight. EtOAc (200 mL) was added and the resulting mixture washed with citric acid solution, NaHCO3 solution, and aq. NaCl solution. The organic layer was dried with MgSO4. The EtOAc was evaporated to yield a colorless oil. The colorless oil (crude product) was purified by column chromatography (1:1 EtOAc/Hexane) to yield 4-{(2-benzyloxy-ethyl)-[4-tert-butoxycarbonylamino-4-(S)-(tetrahydro-pyran-4-yl)-butyryl]-amino}-cis-cyclohexanecarboxylic acid benzyl ester as a residue.

Provenance & Evidence