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iPr2EtN (4.72 mL, 27.1 mmol) was added to a solution of (4-benzyl-1,4-oxazepan-2-ylmethyl) phenyl amine (80) (27.1 mmol) in CH2Cl2. The solution was cooled to 0° C. in an ice bath, then propionyl chloride (5.17 mL, 59.6 mmol) was added dropwise. The reaction was allowed to warm slowly to room temperature, with stirring, overnight. CH2Cl2 and 10% aqueous NaOH was added. The organic layer was removed and the aqueous layer extracted with CH2Cl2 (2×). The organic extracts were dried with sodium sulfate, filtered and concentrated in vacuo. The resulting oily residue was purified by silica gel chromatography (97:1:2::Hexanes:CH2Cl2:2N NH3 in EtOH) to obtain 4-benzyl-1,4-oxazepan-2-ylmethyl)-N-phenylpropionamide (81) as a pale yellow oil. 1H NMR (CDCl3, ppm) 7.36-7.19 (8H, m), 6.94 (2H, broad d, J=6.5 Hz), 3.89-3.38 (5H, m), 3.65 (1H, d, J=13.3 Hz), 3.54 (1H, d, J=13.3 Hz), 2.88-2.75 (2H, m), 2.55 (1H, ddd, J=12.5, 8.9, 4.2 Hz), 2.34 (1H, dd, J=13.5, 8.9 Hz), 1.98-1.68 (4H, m), 0.98 (3H, t, J=7.5 Hz). 13C NMR (CDCl3) 174.05, 143.19, 139.64, 129.60, 129.15, 128.46, 128.35, 127.79, 127.10, 76.80, 67.25, 62.61, 59.05, 54.43, 51.64, 30.42, 27.91, 9.70 ppm. LRMS: 352.72.

1. temperatureto warm slowly to room temperature
2. customThe organic layer was removed
3. extractionthe aqueous layer extracted with CH2Cl2 (2×)
4. dry with materialThe organic extracts were dried with sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe resulting oily residue was purified by silica gel chromatography (97:1:2::Hexanes:CH2Cl2:2N NH3 in EtOH)