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0 °C

Compound 25 (1.00 g, 6.84 mmol) and Et3N (1.4 mL, 10.26 mmol) were dissolved in MeOH and cooled to 0° C. Propionyl chloride (633 mg, 6.84 mmol) was added dropwise and the reaction was stirred at room temperature for 4 hours. The volatiles were removed and the residue was taken up in CH2Cl2 (40 mL), washed with 10% citric acid (20 mL), satd. NaHCO3 (20 mL) and brine (20 mL). The organic layer was dried with Na2SO4, filtered and the volatiles were removed to yield 1.33 g of a white, crystalline solid (1.33 g, 96% yield). An analytical sample was recrystallized from EtOAc/hexanes. m.p.=91-92° C. 1H NMR (CDCl3) δ 8.80 (br s, 1H, NH), 7.62 (d, 1H, ArH, J=7.85 Hz), 7.38 (d, 1H, ArH, J=7.2 Hz), 7.20 (3H, ArH), 5.80 (br s, 1H, NH), 4.60 (d, 2H, ArCH2, J=5.1 Hz), 2.20 (q, 2H, COCH2CH3, J=7.6 Hz), 1.14 (t, 3H, COCH2CH3, J=7.6 Hz). 13C NMR (CDCl3) δ 173.6, 136.5, 126.6, 123.3, 122.5, 119.9, 118.8, 112.8, 111.4, 35.2, 29.7, 9.9. IR (KBr) vmax cm−1: 3405, 1891, 1634, 1532, 1097.

1. customThe volatiles were removed
2. washwashed with 10% citric acid (20 mL)
3. dry with materialThe organic layer was dried with Na2SO4
4. filtrationfiltered
5. customthe volatiles were removed