N-propyl-1,4-dioxaspiro[4.5]decan-8-amine

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-N-propylamino-cyclohexanone-ethyleneketal 2 (134 g, 0.673 mol) was taken in tetrahydrofuran (268 ml) and cooled to 4-6° C. Concentrated hydrochloric acid (178 ml, 2.01 mol) was diluted with water (2144 ml) and the mixture was cooled to 4° C. This diluted hydrochloric acid was added to the reaction mixture at 4-6° C. in 15 minutes. The reaction was allowed to come to 24-26° C. and stirring was continued for 24 hours. The reaction mass (2750 ml) was concentrated to 1800 ml at 50° C. and 35 mbar pressure. Sodium carbonate (148 g, 1.4 mol) was added to achieve pH 10. The reaction mixture was extracted with dichloromethane (3670 ml). The dichloromethane layers were combined and dried over sodium sulfate (20 g). The dichloromethane layer was concentrated to dryness at 40° C. and 15 mbar pressure. The product 3 was yellow viscous oil. The weight of the product 3 obtained was 52.5 g (52.84%); GC purity 86.07%. the mixture was cooled to 4° C to come to 24-26° C. The reaction mass (2750 ml) was concentrated to 1800 ml at 50° C. The reaction mixture was extracted with dichloromethane (3670 ml) dried over sodium sulfate (20 g) The dichloromethane layer was concentrated to dryness at 40° C.

Conditions: temp:2.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of n-propyl amine (162 ml, 1.474 mol) in methanol (500 ml) was chilled to 0-5° C. To this solution was added methanolic hydrochloric acid (155 ml, 44.47%) dropwise over a period of 30 minutes to achieve a pH of 6-7. Cyclohexandione monoethyleneketal 1 (100 g, 0.641 mol) was charged at 5° C. and the reaction was stirred for 15 minutes. Sodium cyanoborohydride (60 g, 0.952 mol) was added in 15 minutes at 5° C. The pH increased to about 8 and methanolic hydrochloric acid (15 ml, 44.47%) was added to bring the pH to 6-7. The reaction was allowed to come to 24-26° C. Stirring was continued for 2 hours. Methanol was distilled off (450 ml). Sodium carbonate (95 g, 0.896 mol) was dissolved in water (850 ml) and charged to the reaction mass at ambient temperature in one shot. The reaction mass was extracted with dichloromethane (2500 ml). The dichloromethane layers were combined and dried over sodium sulfate (8.5 g). The dichloromethane layer was concentrated to dryness at 40° C. and 15 mbar pressure. The product 2 was light yellow viscous oil. The weight of the product 2 obtained was 135 g (105.8%); GC purity 97.74%. was added to come to 24-26° C Stirring was continued for 2 hours Methanol was distilled off (450 ml) charged to the reaction mass at ambient temperature in one shot The reaction mass was extracted with dichloromethane (2500 ml) dried over sodium sulfate (8.5 g) The dichloromethane layer was concentrated to dryness at 40° C.

Conditions: temp:2.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of n-propyl amine (162 ml, 1.474 mol) in methanol (500 ml) was chilled to 0-5° C. To this solution was added methanolic hydrochloric acid (155 ml, 44.47%) dropwise over a period of 30 minutes to achieve a pH of 6-7. Cyclohexandione monoethyleneketal 1 (100 g, 0.641 mol) was charged at 5° C. and the reaction was stirred for 15 minutes. Sodium cyanoborohydride (60 g, 0.952 mol) was added in 15 minutes at 5° C. The pH increased to about 8 and methanolic hydrochloric acid (15 ml, 44.47%) was added to bring the pH to 6-7. The reaction was allowed to come to 24-26° C. Stirring was continued for 2 hours. Methanol was distilled off (450 ml). Sodium carbonate (95 g, 0.896 mol) was dissolved in water (850 ml) and charged to the reaction mass at ambient temperature in one shot. The reaction mass was extracted with dichloromethane (2500 ml). The dichloromethane layers were combined and dried over sodium sulfate (8.5 g). The dichloromethane layer was concentrated to dryness at 40° C. and 15 mbar pressure. The product 2 was light yellow viscous oil. The weight of the product 2 obtained was 135 g (105.8%); GC purity 97.74%. was added to come to 24-26° C Stirring was continued for 2 hours Methanol was distilled off (450 ml) charged to the reaction mass at ambient temperature in one shot The reaction mass was extracted with dichloromethane (2500 ml) dried over sodium sulfate (8.5 g) The dichloromethane layer was concentrated to dryness at 40° C.

Conditions: temp:5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-N-propylamino-cyclohexanone-ethyleneketal 2 (134 g, 0.673 mol) was taken in tetrahydrofuran (268 ml) and cooled to 4-6° C. Concentrated hydrochloric acid (178 ml, 2.01 mol) was diluted with water (2144 ml) and the mixture was cooled to 4° C. This diluted hydrochloric acid was added to the reaction mixture at 4-6° C. in 15 minutes. The reaction was allowed to come to 24-26° C. and stirring was continued for 24 hours. The reaction mass (2750 ml) was concentrated to 1800 ml at 50° C. and 35 mbar pressure. Sodium carbonate (148 g, 1.4 mol) was added to achieve pH 10. The reaction mixture was extracted with dichloromethane (3670 ml). The dichloromethane layers were combined and dried over sodium sulfate (20 g). The dichloromethane layer was concentrated to dryness at 40° C. and 15 mbar pressure. The product 3 was yellow viscous oil. The weight of the product 3 obtained was 52.5 g (52.84%); GC purity 86.07%. the mixture was cooled to 4° C to come to 24-26° C. The reaction mass (2750 ml) was concentrated to 1800 ml at 50° C. The reaction mixture was extracted with dichloromethane (3670 ml) dried over sodium sulfate (20 g) The dichloromethane layer was concentrated to dryness at 40° C.

Conditions: temp:2.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of n-propyl amine (162 ml, 1.474 mol) in methanol (500 ml) was chilled to 0-5° C. To this solution was added methanolic hydrochloric acid (155 ml, 44.47%) dropwise over a period of 30 minutes to achieve a pH of 6-7. Cyclohexandione monoethyleneketal 1 (100 g, 0.641 mol) was charged at 5° C. and the reaction was stirred for 15 minutes. Sodium cyanoborohydride (60 g, 0.952 mol) was added in 15 minutes at 5° C. The pH increased to about 8 and methanolic hydrochloric acid (15 ml, 44.47%) was added to bring the pH to 6-7. The reaction was allowed to come to 24-26° C. Stirring was continued for 2 hours. Methanol was distilled off (450 ml). Sodium carbonate (95 g, 0.896 mol) was dissolved in water (850 ml) and charged to the reaction mass at ambient temperature in one shot. The reaction mass was extracted with dichloromethane (2500 ml). The dichloromethane layers were combined and dried over sodium sulfate (8.5 g). The dichloromethane layer was concentrated to dryness at 40° C. and 15 mbar pressure. The product 2 was light yellow viscous oil. The weight of the product 2 obtained was 135 g (105.8%); GC purity 97.74%. was added to come to 24-26° C Stirring was continued for 2 hours Methanol was distilled off (450 ml) charged to the reaction mass at ambient temperature in one shot The reaction mass was extracted with dichloromethane (2500 ml) dried over sodium sulfate (8.5 g) The dichloromethane layer was concentrated to dryness at 40° C.

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir: