1-chloroethyl propyl carbonate

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

Procedure: By the procedure of Example 6, piroxicam (3.00 g, 9.1 mmol) and alpha-chloroethyl propyl carbonate (4.52 g, 27.2 mmol) were converted to chromatographed title product, 3.47 g pale yellow foam (7.5 mmol, 83.0%) which gave 3.00 g white crystals from isopropyl alcohol: mp 150°-151° C.; IR (KBr) 1760, 1678 cm-1 : 1H NMR (CDCl3) delta 0.84 (t, J=7 Hz, 3H), 1.46-1.65 (m, 2H), 1.75 (d, J=6 Hz, 3H), 3.11 (s, 3H), 3.97 (t, J=7 Hz, 2H), 6.35 (q, J=6 Hz, 1H), 7.04-7.16 (m, 1H), 7.62-7.97 (m, 5H), 8.30-8.41 (m, 2H), 9.40 (br s, 1H): precise mass calcd for C21H23N3O7S m/e 461.1264, found 461.1260.