Isobutyl chloroformate → HCID 178462117, compound

Participants

Reaction Conditions

Reaction Steps

Trans-4-tert-butoxycarbonylamino-cyclohexanecarboxylic acid (5 g, 20.5 mmol) was dissolved in THF, to which triethylamine (3 mL) was added. The reaction mixture was cooled to 0° C. and a solution of isobutyl chloroformate (2.8 g, 20.7 mmol) in THF was added dropwise. The resulting white suspension was stirred at room temperature for 30 min, after which a solution of (R)-1-phenylethanamine (2.9 g, 20.5 mmol) in THF was added dropwise. The reaction mixture was then stirred at room temperature for 4 h, after which LC-MS showed one major peak corresponding to desired product. The reaction mixture was concentrated, and the residue was diluted with water (250 mL). The resulting white precipitate was filtered, washing with ether, to afford a dry white solid tert-butyl trans-4-((R)-1-phenylethylcarbamoyl)cyclohexylcarbamate (5.2 g).

Provenance & Evidence