Morpholine → 5,5-Dichloro-1-morpholinopent-4-ene-1,3-dione

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Two separate solutions of 4-Chloro-4-(2,2,2-trichloro-ethyl)-oxetan-2-one (62.5 g, 0.26 mmol) and morpholine (24.0 g, 0.28 mol) in dichloromethane (120 ml) were added simultaneously to a mixture of NaHCO3 (44.0 g, 0.52 mol) in dry dichloromethane (300 ml). The reaction was maintained at 15° C. over 140 min with stirring. The reaction was filtered, washed with dichloromethane (3×100 ml) and the combined organic layers were concentrated in vacuo to a slurry which was then passed through a short silica pad, and further washed with dichloromethane (4×100 ml). The combined organic layers were concentrated in vacuo, suspended in hexane (400 ml) and stirred for 1 h, filtered and dried to give a cream solid. The solid was suspended in tert-butyl methyl ether (100 ml), stirred for 15 min, filtered, washed with butyl methyl ether and dried to give the desired compound as a white powder (47.8 g, 72%). m/z (LC-MS, ESP): 252 (M++1).

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