Tert-butyl 4-hydroxy-3-methoxyphenethylcarbamate

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

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

Procedure: 34.6 g (0.23 mol) of 1-chloromethyl-3-fluoro-benzene in 50 ml of dry dimethylformamide were added to a suspension of 55.9 g (0.209 mol) of [2-(4-hydroxy-3-methoxy-phenyl)-ethyl]-carbamic acid tert-butyl ester, 43 g of K2CO3 and 3.4 g of potassium iodide in 400 ml of dry dimethylformamide. The reaction was stirred at room temperature overnight. Solvent was removed, water was added to the residue and the product was extracted with ethyl acetate. The crude oil obtained was triturated with diethyl ether. The solid was filtered and 58.2 g (74% yield) of the title product were obtained. Solvent was removed water was added to the residue the product was extracted with ethyl acetate The crude oil obtained was triturated with diethyl ether The solid was filtered

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

Procedure: 34.6 g (0.23 mol) of 1-chloromethyl-3-fluoro-benzene in 50 ml of dry dimethylformamide were added to a suspension of 55.9 g (0.209 mol) of [2-(4-hydroxy-3-methoxy-phenyl)-ethyl]-carbamic acid tert-butyl ester, 43 g of K2CO3 and 3.4 g of potassium iodide in 400 ml of dry dimethylformamide. The reaction was stirred at room temperature overnight. Solvent was removed, water was added to the residue and the product was extracted with ethyl acetate. The crude oil obtained was triturated with diethyl ether. The solid was filtered and 58.2 g (74% yield) of the title product were obtained. Solvent was removed water was added to the residue the product was extracted with ethyl acetate The crude oil obtained was triturated with diethyl ether The solid was filtered

Conditions: temp:65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 250 mL round bottom flask containing acetonitrile (18.7 mL) was added tert-butyl 4-hydroxy-3-methoxyphenethylcarbamate (1.0 g, 3.74 mmol), 2-bromopropane (0.51 g, 4.11 mmol), and potassium carbonate (1.5 g, 11.22 mmol). The resulting suspension was stirred at 65° C. for 18 hours. A second addition of 2-bromopropane (0.51 g, 4.11 mmol) was performed and heating was continued for another 18 hours. The reaction mixture was concentrated reaction in vacuo. The resulting oil was dissolved in EtOAc and washed with H2O, aqeuous saturated sodium bicarbonate and brine, then dried with sodium sulfate and concentrated in vacuo. The crude product was purified by silica gel chromatography (0-100% EtOAc in Heptane) to afford tert-butyl 4-isopropoxy-3-methoxyphenethylcarbamate (0.81 g). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 6.84 (d, J=8.03 Hz, 1H), 6.67-6.75 (m, 2H), 4.37-4.70 (m, 2H), 3.86 (s, 3H), 3.27-3.46 (m, 2H), 2.68-2.81 (m, 2H), 1.45 (s, 9H), 1.37 (d, J=6.02 Hz, 6H). heating was continued for another 18 hours The reaction mixture was concentrated reaction in vacuo washed with H2O, aqeuous saturated sodium bicarbonate and brine dried with sodium sulfate concentrated in vacuo The crude product was purified by silica gel chromatography (0-100% EtOAc in Heptane)

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

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

Procedure: 34.6 g (0.23 mol) of 1-chloromethyl-3-fluoro-benzene in 50 ml of dry dimethylformamide were added to a suspension of 55.9 g (0.209 mol) of [2-(4-hydroxy-3-methoxy-phenyl)-ethyl]-carbamic acid tert-butyl ester, 43 g of K2CO3 and 3.4 g of potassium iodide in 400 ml of dry dimethylformamide. The reaction was stirred at room temperature overnight. Solvent was removed, water was added to the residue and the product was extracted with ethyl acetate. The crude oil obtained was triturated with diethyl ether. The solid was filtered and 58.2 g (74% yield) of the title product were obtained. Solvent was removed water was added to the residue the product was extracted with ethyl acetate The crude oil obtained was triturated with diethyl ether The solid was filtered

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

Procedure: 34.6 g (0.23 mol) of 1-chloromethyl-3-fluoro-benzene in 50 ml of dry dimethylformamide were added to a suspension of 55.9 g (0.209 mol) of [2-(4-hydroxy-3-methoxy-phenyl)-ethyl]-carbamic acid tert-butyl ester, 43 g of K2CO3 and 3.4 g of potassium iodide in 400 ml of dry dimethylformamide. The reaction was stirred at room temperature overnight. Solvent was removed, water was added to the residue and the product was extracted with ethyl acetate. The crude oil obtained was triturated with diethyl ether. The solid was filtered and 58.2 g (74% yield) of the title product were obtained. Solvent was removed water was added to the residue the product was extracted with ethyl acetate The crude oil obtained was triturated with diethyl ether The solid was filtered

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

Procedure: 34.6 g (0.23 mol) of 1-chloromethyl-3-fluoro-benzene in 50 ml of dry dimethylformamide were added to a suspension of 55.9 g (0.209 mol) of [2-(4-hydroxy-3-methoxy-phenyl)-ethyl]-carbamic acid tert-butyl ester, 43 g of K2CO3 and 3.4 g of potassium iodide in 400 ml of dry dimethylformamide. The reaction was stirred at room temperature overnight. Solvent was removed, water was added to the residue and the product was extracted with ethyl acetate. The crude oil obtained was triturated with diethyl ether. The solid was filtered and 58.2 g (74% yield) of the title product were obtained. Solvent was removed water was added to the residue the product was extracted with ethyl acetate The crude oil obtained was triturated with diethyl ether The solid was filtered

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

Procedure: 34.6 g (0.23 mol) of 1-chloromethyl-3-fluoro-benzene in 50 ml of dry dimethylformamide were added to a suspension of 55.9 g (0.209 mol) of [2-(4-hydroxy-3-methoxy-phenyl)-ethyl]-carbamic acid tert-butyl ester, 43 g of K2CO3 and 3.4 g of potassium iodide in 400 ml of dry dimethylformamide. The reaction was stirred at room temperature overnight. Solvent was removed, water was added to the residue and the product was extracted with ethyl acetate. The crude oil obtained was triturated with diethyl ether. The solid was filtered and 58.2 g (74% yield) of the title product were obtained. Solvent was removed water was added to the residue the product was extracted with ethyl acetate The crude oil obtained was triturated with diethyl ether The solid was filtered

Conditions: temp:65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 250 mL round bottom flask containing acetonitrile (18.7 mL) was added tert-butyl 4-hydroxy-3-methoxyphenethylcarbamate (1.0 g, 3.74 mmol), 2-bromopropane (0.51 g, 4.11 mmol), and potassium carbonate (1.5 g, 11.22 mmol). The resulting suspension was stirred at 65° C. for 18 hours. A second addition of 2-bromopropane (0.51 g, 4.11 mmol) was performed and heating was continued for another 18 hours. The reaction mixture was concentrated reaction in vacuo. The resulting oil was dissolved in EtOAc and washed with H2O, aqeuous saturated sodium bicarbonate and brine, then dried with sodium sulfate and concentrated in vacuo. The crude product was purified by silica gel chromatography (0-100% EtOAc in Heptane) to afford tert-butyl 4-isopropoxy-3-methoxyphenethylcarbamate (0.81 g). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 6.84 (d, J=8.03 Hz, 1H), 6.67-6.75 (m, 2H), 4.37-4.70 (m, 2H), 3.86 (s, 3H), 3.27-3.46 (m, 2H), 2.68-2.81 (m, 2H), 1.45 (s, 9H), 1.37 (d, J=6.02 Hz, 6H). heating was continued for another 18 hours The reaction mixture was concentrated reaction in vacuo washed with H2O, aqeuous saturated sodium bicarbonate and brine dried with sodium sulfate concentrated in vacuo The crude product was purified by silica gel chromatography (0-100% EtOAc in Heptane)