(2S)-1-[(2-methylpropan-2-yl)oxycarbonyl]azepane-2-carboxylic acid

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (S)-(−)-1-(tert-Butoxycarbonyl)-2-azepanecarboxylic acid (prepared as described in Tetrahedron Letters (1994), 35(2), 237–240) (1.00 g; 4.11 mmol) is dissolved in methylene chloride (20 mL) at ambient temperature. n-Octylamine (0.584 g; 4.52 mmol), N,N-diisopropylethylamine (1.17 g; 9.04 mmol) and PyBOP (2.35 g; 4.52 mmol) are added sequentially. The reaction is stirred for 24 hours at room temperature, then concentrated under reduced pressure. The residue is purified via silca gel chromatography affording the desired product (2). concentrated under reduced pressure The residue is purified via silca gel chromatography