NSC27893

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

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

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

Procedure: 1-Methyl-3,4-dihydroisoquinoline (4.25 g, 29.3 mmol) was dissolved in ice cold concentrated sulfuric acid (15 ml) and to this was added potassium nitrate (3.25 g, 32.2 mmol) portionwise with cooling. The mixture was stirred overnight, poured over ice, basified with concentrated ammonium hydroxide, and the precipitated solid was collected, washed with water and dried: 4.47 g (80%), MS (M+H)+ 191, 1H NMR (D2O), 8.30 (d, 1H), 8.22 (dd, 1H), 7.39 (d, 1H), 3.80-3.62 (m, 2H), 2.92-2.70 (m, 2H), 2.48 (broad s, 3H). with cooling poured over ice the precipitated solid was collected washed with water dried

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

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

Procedure: In close analogy to the procedure described above, 1-methyl-3,4-dihydro-isoquinoline is reacted with sodium triacetoxyborohydride to provide the title compound.

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

Procedure: In close analogy to the procedure described above, N-phenethyl-acetamide is reacted with phosphorus pentoxide to provide the title compound.

Conditions: temp:-35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a cooled (−35° C.) solution of reducing agent 9 (526 mg, (0.78 mmol) in dichloromethane (3 mL) is added solution of 1-methyl-3,4-dihydroisoquinoline (32 mg, 0.22 mmol) in dichloromethane (3 mL) dropwise over 15 min. The mixture is allowed to warm to −10° C. over 1 h and then kept at 0° C. for 4 h. The solvent is removed in vacuo and the residue is dissolved in methanol (10 mL). After cooling to 0° C., Amberlyst 15 (1 g) is added and the mixture is shaken for 1 h at room temperature. The resin is filtered off and washed with dichloromethane and methanol, then solution of ammonia in methanol (2M, 3 mL) is added and the mixture is shaken overnight, then filtered. The filtrate is evaporated in vacuo to give (R)-1-Methyl-1,2,3,4-tetrahydroisoquinoline (26 mg, 82%, e.e.=74%, determined by chiral HPLC). to warm to −10° C. over 1 h The solvent is removed in vacuo the residue is dissolved in methanol (10 mL) After cooling to 0° C. Amberlyst 15 (1 g) is added The resin is filtered off washed with dichloromethane and methanol solution of ammonia in methanol (2M, 3 mL) is added the mixture is shaken overnight filtered The filtrate is evaporated in vacuo

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

Procedure: A reaction vessel was charged with 2723 ml acetonitrile which was held under a nitrogen blanket. With the reaction vessel cooled in an ice bath, 1888.5 g stannic chloride was added gradually below the surface of the acetonitrile with stirring over a period of 2 hours 20 minutes. During the addition period, the temperature of the reaction mixture varied between 3° C. and 39° C. The mixture was allowed to stand overnight at room temperature. With the reaction mixture at 22° C., 916 g 2-chloroethylbenzene was added in increments to the reaction vessel over a ten-minute period. With the mixture under reduced pressure and heated, 1369.7 g acetonitrile was gradually stripped from the mixture. During the stripping period, the temperature of the mixture varied from 23° C. to 84° C. and the pressure in the reaction vessel varied from 45 mm Hg to about 100 mm Hg. The reaction mixture, milky in color, was heated to reflux. The reaction mixture was maintained at reflux for about 61/2 hours during which period the temperature of the mixture varied from about 109° C. to about 113° C. With the temperature of the reaction mixture at about 75° C., the entire amount of previously-stripped acetonitrile was added back to the reaction mixture. The mixture was allowed to cool, stand overnight and was observed to contain a slurry. About 2 liters of methylene chloride was added to the mixture. Then, this mixture was added with stirring to 4 liters of 10% sodium hydroxide previously cooled to about 10° C. The temperature of the mixture reached 40° C. and the mixture was found to be acidic. About 13 liters more 10% sodium hydroxide was added to make the mixture alkaline. The organic phase was separated and washed with water. The organic phase was dried over sodium sulfate, filtered and stripped on a rotary evaporator at a temperature of 35°-40° C. to provide 749.3 g 1-methyl-3,4-dihyroisoquinoline (79.2% yield based on 2-chloroethylbenzene starting material). An autoclave was charged with a slurry of 300 g 50%-wetted 5% palladium-on-carbon catalyst in 8 liters absolute ethanol. Then, there was added to the slurry a mixture of 2143.2 g 1-methyl-3,4-dihydroisoquinoline along with 82.2 g 2-chloroethylbenzene contaminant (such as prepared by the foregoing procedures). The autoclave was flushed with hydrogen gas. With the reaction mixture being stirred, the autoclave was gradually pressurized with hydrogen over a period of about two hours to a final pressure of about 185 psi (12.5 atm; 12.6×105Pascal) and temperature of about 50° C. The autoclave was maintained in this pressurized condition overnight. The temperature of the autoclave dropped to 9° C. after venting with stirring of the reaction mixture. The mixture was filtered and stripped of ethanol to provide 2100.0 g 1-methyl-1,2,3,4-tetrahydroisoquinoline (96.7% based on 1-methyl-3,4-di-hydroisoquinoline starting material). A reaction vessel was charged with a mixture of 1136 g 1-methyl-1,2,3,4-tetrahydroisoquinoline in 1360 ml toluene. The mixture was cooled to 10° C., stirred and placed under a nitrogen blanket. With the temperature of the mixture at 10° C., 150 ml dichloroacetyl chloride was added to the reaction mixture gradually in a 13-minute period, after which time the temperature reached 70° C. Then, over a two-hour period portions of dichloroacetyl chloride and toluene were added gradually until a total of 780 ml dichloroacetyl chloride and 2100 ml toluene were added. The mixture was heated to reflux over a 21/2 hour period during which time HCl gas evolved from the reaction mixture. The mixture was cooled and 100 g silica gel was added to the mixture. The mixture was filtered and then stripped of toluene and of excess dichloroacetyl chloride to provide 1801.5 g 2-(dichloroacetyl)-1-methyl-1,2,3,4-tetrahydroisoquinoline (97.7% yield based on 1-methyl-1,2,3,4-tetrahydroisoquinoline starting material). Then, there was added to the slurry as prepared by the foregoing procedures) The autoclave was flushed with hydrogen gas pressure of about 185 psi (12.5 atm; 12.6×105Pascal) and temperature of about 50° C The autoclave was maintained in this pressurized condition overnight The temperature of the autoclave dropped to 9° C. with stirring of the reaction mixture The mixture was filtered

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A reaction vessel was charged with 2723 ml acetonitrile which was held under a nitrogen blanket. With the reaction vessel cooled in an ice bath, 1888.5 g stannic chloride was added gradually below the surface of the acetonitrile with stirring over a period of 2 hours 20 minutes. During the addition period, the temperature of the reaction mixture varied between 3° C. and 39° C. The mixture was allowed to stand overnight at room temperature. With the reaction mixture at 22° C., 916 g 2-chloroethylbenzene was added in increments to the reaction vessel over a ten-minute period. With the mixture under reduced pressure and heated, 1369.7 g acetonitrile was gradually stripped from the mixture. During the stripping period, the temperature of the mixture varied from 23° C. to 84° C. and the pressure in the reaction vessel varied from 45 mm Hg to about 100 mm Hg. The reaction mixture, milky in color, was heated to reflux. The reaction mixture was maintained at reflux for about 61/2 hours during which period the temperature of the mixture varied from about 109° C. to about 113° C. With the temperature of the reaction mixture at about 75° C., the entire amount of previously-stripped acetonitrile was added back to the reaction mixture. The mixture was allowed to cool, stand overnight and was observed to contain a slurry. About 2 liters of methylene chloride was added to the mixture. Then, this mixture was added with stirring to 4 liters of 10% sodium hydroxide previously cooled to about 10° C. The temperature of the mixture reached 40° C. and the mixture was found to be acidic. About 13 liters more 10% sodium hydroxide was added to make the mixture alkaline. The organic phase was separated and washed with water. The organic phase was dried over sodium sulfate, filtered and stripped on a rotary evaporator at a temperature of 35°-40° C. to provide 749.3 g 1-methyl-3,4-dihyroisoquinoline (79.2% yield based on 2-chloroethylbenzene starting material). An autoclave was charged with a slurry of 300 g 50%-wetted 5% palladium-on-carbon catalyst in 8 liters absolute ethanol. Then, there was added to the slurry a mixture of 2143.2 g 1-methyl-3,4-dihydroisoquinoline along with 82.2 g 2-chloroethylbenzene contaminant (such as prepared by the foregoing procedures). The autoclave was flushed with hydrogen gas. With the reaction mixture being stirred, the autoclave was gradually pressurized with hydrogen over a period of about two hours to a final pressure of about 185 psi (12.5 atm; 12.6×105Pascal) and temperature of about 50° C. The autoclave was maintained in this pressurized condition overnight. The temperature of the autoclave dropped to 9° C. after venting with stirring of the reaction mixture. The mixture was filtered and stripped of ethanol to provide 2100.0 g 1-methyl-1,2,3,4-tetrahydroisoquinoline (96.7% based on 1-methyl-3,4-di-hydroisoquinoline starting material). A reaction vessel was charged with a mixture of 1136 g 1-methyl-1,2,3,4-tetrahydroisoquinoline in 1360 ml toluene. The mixture was cooled to 10° C., stirred and placed under a nitrogen blanket. With the temperature of the mixture at 10° C., 150 ml dichloroacetyl chloride was added to the reaction mixture gradually in a 13-minute period, after which time the temperature reached 70° C. Then, over a two-hour period portions of dichloroacetyl chloride and toluene were added gradually until a total of 780 ml dichloroacetyl chloride and 2100 ml toluene were added. The mixture was heated to reflux over a 21/2 hour period during which time HCl gas evolved from the reaction mixture. The mixture was cooled and 100 g silica gel was added to the mixture. The mixture was filtered and then stripped of toluene and of excess dichloroacetyl chloride to provide 1801.5 g 2-(dichloroacetyl)-1-methyl-1,2,3,4-tetrahydroisoquinoline (97.7% yield based on 1-methyl-1,2,3,4-tetrahydroisoquinoline starting material). With the reaction vessel cooled in an ice bath During the addition period the temperature of the reaction mixture varied between 3° C. and 39° C to stand overnight at room temperature With the mixture under reduced pressure and heated varied from 23° C. to 84° C. The reaction mixture, milky in color, was heated to reflux The reaction mixture was maintained at reflux for about 61/2 hours during which period the temperature of the mixture varied from about 109° C. to about 113° C to cool stand overnight Then, this mixture was added reached 40° C. The organic phase was separated washed with water The organic phase was dried over sodium sulfate filtered stripped on a rotary evaporator at a temperature of 35°-40° C.

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of (±) 1-methyl-3,4-dihydroisoquinoline (2.57 g, 17.7 mmol) in conc. sulfuric acid (10 ml) was added dropwise to a stirred mixture of potassium nitrate (1.93 g, 19.1 mmol) in conc. sulfuric acid (10 ml) at −5° C. The mixture was allowed to reach room temperature over 2 h and then heated at 60° C. for 4 h. The reaction mixture was poured into ice-water (100 ml) and basified (pH 9) with KOH pellets. Extraction into dichloromethane (3×50 ml), drying over anhydrous sodium sulfate and evaporation in vacuo yielded the crude product. Purification by chromatography through silica gel, eluting with (0.5% 0.88 NH3: 4.5% CH3OH: 95% CH2Cl2) afforded the title compound as a dark brown oil (1.92 g, 57%). Extraction into dichloromethane (3×50 ml) drying over anhydrous sodium sulfate and evaporation in vacuo yielded the crude product Purification by chromatography through silica gel eluting with (0.5% 0.88 NH3: 4.5% CH3OH: 95% CH2Cl2)

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of (±) 1-methyl-3,4-dihydroisoquinoline (2.57 g, 17.7 mmol) in conc. sulfuric acid (10 ml) was added dropwise to a stirred mixture of potassium nitrate (1.93 g, 19.1 mmol) in conc. sulfuric acid (10 ml) at −5° C. The mixture was allowed to reach room temperature over 2 h and then heated at 60° C. for 4 h. The reaction mixture was poured into ice-water (100 ml) and basified (pH 9) with KOH pellets. Extraction into dichloromethane (3×50 ml), drying over anhydrous sodium sulfate and evaporation in vacuo yielded the crude product. Purification by chromatography through silica gel, eluting with (0.5% 0.88 NH3: 4.5% CH3OH: 95% CH2Cl2) afforded the title compound as a dark brown oil (1.92 g, 57%). Extraction into dichloromethane (3×50 ml) drying over anhydrous sodium sulfate and evaporation in vacuo yielded the crude product Purification by chromatography through silica gel eluting with (0.5% 0.88 NH3: 4.5% CH3OH: 95% CH2Cl2)

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

Procedure: 1-Methyl-3,4-dihydroisoquinoline (4.25 g, 29.3 mmol) was dissolved in ice cold concentrated sulfuric acid (15 ml) and to this was added potassium nitrate (3.25 g, 32.2 mmol) portionwise with cooling. The mixture was stirred overnight, poured over ice, basified with concentrated ammonium hydroxide, and the precipitated solid was collected, washed with water and dried: 4.47 g (80%), MS (M+H)+ 191, 1H NMR (D2O), 8.30 (d, 1H), 8.22 (dd, 1H), 7.39 (d, 1H), 3.80-3.62 (m, 2H), 2.92-2.70 (m, 2H), 2.48 (broad s, 3H). with cooling poured over ice the precipitated solid was collected washed with water dried