1-(2-chloroethyl)-3-(dicyclopropylmethyl)urea

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

Procedure: 25 g of raw urea obtained by step (a) are suspended in 150 ml of water and heated under reflux for 2 hours. After allowing the temperature of the mixture to return to room temperature, the aqueous solution is extracted with ether. The aqueous phase is separated and made alkaline by adding concentrated ammonia. The resulting precipitate is separated by suction, washed with water and dried. 11.8 g of 2-(dicyclopropylmethylamino) oxazoline are thus recovered, melting at 105°-106° C. A mixture of the latter with N-(dicyclopropylmethyl) N'-(β-chloroethyl) urea gives a decrease of the melting point. heated under reflux for 2 hours to return to room temperature the aqueous solution is extracted with ether The aqueous phase is separated by adding concentrated ammonia The resulting precipitate is separated by suction washed with water dried 11.8 g of 2-(dicyclopropylmethylamino) oxazoline are thus recovered A mixture of the latter with N-(dicyclopropylmethyl) N'-(β-chloroethyl) urea gives a decrease of the melting point

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

Procedure: 25 g of raw urea obtained by step (a) are suspended in 150 ml of water and heated under reflux for 2 hours. After allowing the temperature of the mixture to return to room temperature, the aqueous solution is extracted with ether. The aqueous phase is separated and made alkaline by adding concentrated ammonia. The resulting precipitate is separated by suction, washed with water and dried. 11.8 g of 2-(dicyclopropylmethylamino) oxazoline are thus recovered, melting at 105°-106° C. A mixture of the latter with N-(dicyclopropylmethyl) N'-(β-chloroethyl) urea gives a decrease of the melting point. heated under reflux for 2 hours to return to room temperature the aqueous solution is extracted with ether The aqueous phase is separated by adding concentrated ammonia The resulting precipitate is separated by suction washed with water dried 11.8 g of 2-(dicyclopropylmethylamino) oxazoline are thus recovered A mixture of the latter with N-(dicyclopropylmethyl) N'-(β-chloroethyl) urea gives a decrease of the melting point

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

Procedure: A solution made from 13.4 g of dicyclopropylmethylamine in 30 ml tetrahydrofuran is added dropwise to a solution of 13 g of β-chloroetyl isocyanate in 15 ml tetrahydrofuran while maintaining the inner temperature from 0° to +5° C. Then, the reaction mixture is kept at room temperature for 15 hours. Afterwards, the solution is evaporated to dryness and the dry residue, weighing 26.5 g, is used as such for the next step of the synthesis. For analytical purpose, a sample of the raw urea is recrystallised from acetonitrile. The N-(dicyclopropylmethyl) N-(β-chloroethyl) urea occurs as white crystals melting at 103°-104° C. with decomposition. while maintaining the inner temperature from 0° to +5° C Afterwards, the solution is evaporated to dryness such for the next step of the synthesis For analytical purpose, a sample of the raw urea is recrystallised from acetonitrile

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

Procedure: 25 g of raw urea obtained by step (a) are suspended in 150 ml of water and heated under reflux for 2 hours. After allowing the temperature of the mixture to return to room temperature, the aqueous solution is extracted with ether. The aqueous phase is separated and made alkaline by adding concentrated ammonia. The resulting precipitate is separated by suction, washed with water and dried. 11.8 g of 2-(dicyclopropylmethylamino) oxazoline are thus recovered, melting at 105°-106° C. A mixture of the latter with N-(dicyclopropylmethyl) N'-(β-chloroethyl) urea gives a decrease of the melting point. heated under reflux for 2 hours to return to room temperature the aqueous solution is extracted with ether The aqueous phase is separated by adding concentrated ammonia The resulting precipitate is separated by suction washed with water dried 11.8 g of 2-(dicyclopropylmethylamino) oxazoline are thus recovered A mixture of the latter with N-(dicyclopropylmethyl) N'-(β-chloroethyl) urea gives a decrease of the melting point

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

Procedure: A solution made from 13.4 g of dicyclopropylmethylamine in 30 ml tetrahydrofuran is added dropwise to a solution of 13 g of β-chloroetyl isocyanate in 15 ml tetrahydrofuran while maintaining the inner temperature from 0° to +5° C. Then, the reaction mixture is kept at room temperature for 15 hours. Afterwards, the solution is evaporated to dryness and the dry residue, weighing 26.5 g, is used as such for the next step of the synthesis. For analytical purpose, a sample of the raw urea is recrystallised from acetonitrile. The N-(dicyclopropylmethyl) N-(β-chloroethyl) urea occurs as white crystals melting at 103°-104° C. with decomposition. while maintaining the inner temperature from 0° to +5° C Afterwards, the solution is evaporated to dryness such for the next step of the synthesis For analytical purpose, a sample of the raw urea is recrystallised from acetonitrile