ethoxycarbonyl ethyl carbonate

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

Procedure: The dialkyl pyrocarbonates may be prepared by reacting alkali metal alkyl carbonate, e.g., sodium ethyl carbonate, with alkyl halocarbonate, e.g., ethyl chlorocarbonate (ethyl chloroformate). The alkyl groups of the alkyl carbonate and halocarbonate are chosen to correspond to the alkyl group desired for the pyrocarbonate. For example, sodium ethoxide, which can be prepared by dissolving sodium metal in toluene solution of ethyl alcohol, is carbonated with carbon dioxide to prepare sodium ethyl carbonate. Thereafter, the sodium ethyl carbonate is reacted with ethyl chloroformate to form diethyl pyrocarbonate and sodium chloride. The chloride salt is filtered and the pyrocarbonate recovered by distillation.

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (E)-3-{3-chloro-5-methyl-4-[(5-{[4-(trifluoromethyl)benzyl]-oxy}pyridin-2-yl)oxy]phenyl}prop-2-enoic acid (139 mg) and 4-{2-[4-(piperazin-1-ylmethyl)-phenyl]ethoxy}benzonitrile trifluoroacetate (131 mg) in DMF (6 mL) was added DEPC (0.073 mL) and Et3N (0.165 mL) at 0° C. After stirring at 0° C. for 1 hour, to the reaction mixture was added H2O, and extracted with AcOEt. The organic layer was washed with saturated aqueous NaCl, dried over anhydrous MgSO4, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (AcOEt) to give 4-{2-[4-({4-[(E)-3-{3-chloro-5-methyl-4-[(5-{[4-(trifluoromethyl)benzyl]oxy}pyridin-2-yl)oxy]phenyl}prop-2-enoyl]piperazin-1-yl}methyl)phenyl]ethoxy}benzonitrile as a pale yellow amorphous (195 mg). extracted with AcOEt The organic layer was washed with saturated aqueous NaCl dried over anhydrous MgSO4 concentrated under reduced pressure The residue was purified by silica gel column chromatography (AcOEt)

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

Procedure: TFA (2 ml) was added to tert-butyl (3aR*,4R*,9bR*)-4-(3-thienyl)-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinoline-1-carboxylate (219 mg, 0.61 mmol), and the mixture was stirred at room temperature for 3 min. Ice was added to the reaction solution, and the mixture was basified with 8N aqueous sodium hydroxide solution and extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The obtained residue was dissolved in tetrahydrofuran (3 ml), 2-(benzoylamino)benzoic acid (162 mg, 0.67 mmol) and triethylamine (124 mg, 1.2 mmol) were added. DEPC (99 mg, 0.61 mmol) was added at 0° C. and the mixture was stirred at room temperature for 30 min. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (9:1-3:1, v/v) to give the title compound (126 mg, 43%) as colorless crystals. Ice was added to the reaction solution extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The obtained residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred at room temperature for 30 min the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (9:1-3:1

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

Procedure: TFA (1 ml) was added to tert-butyl (3aR*,4R*,9bR*)-4-(3-thienyl)-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinoline-1-carboxylate (178 mg, 0.5 mmol), and the mixture was stirred at room temperature for 3 min. Ice was added to the reaction solution, the mixture was basified with 8N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The obtained residue was dissolved in tetrahydrofuran (3 ml), and (1S,2R)-2-(benzoylamino)cyclopentanecarboxylic acid (117 mg, 0.5 mmol) and triethylamine (101 mg, 1.0 mmol) were added. DEPC (82 mg, 0.5 mmol) was added at 0° C. and the mixture was stirred at room temperature for 30 min. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (5:1-2:1, v/v) to give the title compound (104 mg, 44%) as a colorless powder. Ice was added to the reaction solution the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The obtained residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred at room temperature for 30 min the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (5:1-2:1

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

Procedure: To a solution of (1R,2S)-2-{[(3aR,4R,9bR)-4-(methoxymethyl)-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinolin-1-yl]carbonyl}cyclohexaneamine hydrochloride (200 mg, 0.480 mmol) in tetrahydrofuran (5 ml) were added triethylamine (0.199 ml, 1.44 mmol), 4-(1H-imidazol-2-yl)benzoic acid (99.0 mg, 0.529 mmol) and DEPC (0.079 ml, 0.529 mmol) under ice-cooling, and the mixture was stirred at room temperature for 1 hr. Water was added to the reaction solution, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous MgSO4 and concentrated under reduced pressure. The obtained residue was subjected to column chromatography using silica gel and eluted with ethyl acetate-methanol (1:0-4:1) to give the title compound (150 mg, 61%) as an amorphous form. cooling the mixture was extracted with ethyl acetate The organic layer was dried over anhydrous MgSO4 concentrated under reduced pressure eluted with ethyl acetate-methanol (1:0-4:1)

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

Procedure: To a solution (5 ml) of (1R,2S)-2-{[(3aR,4R,9bR)-4-(methoxymethyl)-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinolin-1-yl]carbonyl}cyclohexaneamine hydrochloride (200 mg, 0.480 mmol) in THF were added triethylamine (0.199 ml, 1.44 mmol), 1H-1,2,3-benzotriazole-5-carboxylic acid (78.3 mg, 0.480 mmol) and DEPC (0.079 ml, 0.528 mmol) under ice-cooling, and the mixture was stirred at room temperature for 1 hr. Water was added to the reaction solution, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous MgSO4, and concentrated under reduced pressure. The obtained residue was subjected to column chromatography using silica gel and eluted with hexane:ethyl acetate (1:1-1:9) to give the title compound (187 mg, 80%) as an amorphous form. cooling the mixture was extracted with ethyl acetate The organic layer was dried over anhydrous MgSO4 concentrated under reduced pressure eluted with hexane:ethyl acetate (1:1-1:9)

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

Procedure: To a solution (5 ml) of (1R,2S)-2-{[(3aR,4R,9bR)-4-(methoxymethyl)-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinolin-1-yl]carbonyl}cyclohexaneamine hydrochloride (200 mg, 0.480 mmol) in THF were added triethylamine (0.199 ml, 1.44 mmol), 1H-1,2,3-benzotriazole-5-carboxylic acid (78.3 mg, 0.480 mmol) and DEPC (0.079 ml, 0.528 mmol) under ice-cooling, and the mixture was stirred at room temperature for 1 hr. Water was added to the reaction solution, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous MgSO4, and concentrated under reduced pressure. The obtained residue was subjected to column chromatography using silica gel and eluted with hexane:ethyl acetate (1:1-1:9) to give the title compound (187 mg, 80%) as an amorphous form. cooling the mixture was extracted with ethyl acetate The organic layer was dried over anhydrous MgSO4 concentrated under reduced pressure eluted with hexane:ethyl acetate (1:1-1:9)