(E)-2,3-dichloroprop-2-enal

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

Procedure: Chloromalondialdehyde (19 grams, 0.178 mol) was suspended in methylene chloride (100 ml) with dry dimethylformamide (DMF) (2.5 ml). This was mechanically stirred under a nitrogen atmosphere while a solution of oxalyl chloride (23.7 grams/16.3 ml, 0.185 mol) in methylene chloride (50 ml) was added dropwise over 20 minutes. The reaction mixture at first started to warm from 22° to 28°, but as the evolution of gases increased the temperature fell to 18°. The reaction was stirred at room temperature and was followed by thin layer chromatography (ethyl acetate/hexanes, 1:1) until conversion to 2,3-dichloroacrolein was complete. A solution of 1-amino-cyclohexen-3-one (19.85 grams, 0.18 mol) in DMF (125 ml) was added dropwise and the reaction was heated to 70° C. overnight. The reaction mixture was cooled to room temperature, diluted with saturated NaHCO3, and twice extracted with ethyl acetate (400 ml and 200 ml). The combined organic layers were washed with water (3×) and brine (1×). The organic solution was stirred with MgSO4 and decolorizing carbon (Darco (trademark)); then filtered through Super Cel (trademark)) and concentrated to a brown solid. Yield 21 grams (65%); mp 90°-91° C. NMR (CDCl3, 300 MHz) δ8.6 (d, 1), 8.24 (d, 1), 3.1 (t, 2), 2.7 (m, 2), 2.15 (m, 2). was added dropwise over 20 minutes to warm from 22° to 28° as the evolution of gases increased the temperature fell to 18° the reaction was heated to 70° C. overnight The reaction mixture was cooled to room temperature twice extracted with ethyl acetate (400 ml and 200 ml) The combined organic layers were washed with water (3×) and brine (1×) The organic solution was stirred with MgSO4 then filtered through Super Cel (trademark)) and concentrated to a brown solid

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

Procedure: In reaction 3 of Scheme 1, a solution of oxalyl chloride in methylene chloride is added dropwise to a solution of chloromalondialdehyde III in methyene chloride and a phase transfer catalyst, such as dimethylformamide, under inert reaction conditions. The reaction mixture is stirred at room temperature until conversion to the corresponding 2,3-dichloroacrolein is complete. In reaction 4 of Scheme 1, a solution of 1-amino-cyclohexan-3-one VI in dimethylformamide is added dropwise to the above acrolein to form the corresponding 3-chloro-5,6,7,8-tetrahydroquinolin-5-one VII. The reaction, generally carried out overnight, will be in the temperature range between about 60° C. to about 80° C., preferably about 70° C. In reaction 3 of Scheme 1 In reaction 4 of Scheme 1