ethyl thiomorpholine-3-carboxylate

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

Procedure: A warm solution of 2-aminoethanethiol (10.0 g, 0.130 mol) and triethylamine (36 mL, 0.260 mol) in chloroform is added over 5 minutes to a solution of ethyl 2,3-dibromopropionate (33.9 g, 0.130 mol) in a chloroform/toluene (1:1.6) solution. The reaction mixture is stirred at room temperature for 2.5 hours, filtered and concentrated in vacuo to obtain an orange liquid. The liquid is vacuum distilled to give the title product as a colorless liquid, bp 121°-124° C. at 3 mm Hg. filtered concentrated in vacuo to obtain an orange liquid distilled

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

Procedure: A warm solution of 2-aminoethanethiol (10.0 g, 0.130 mol) and triethylamine (36 mL, 0.260 mol) in chloroform is added over 5 minutes to a solution of ethyl 2,3-dibromopropionate (33.9 g, 0.130 mol) in a chloroform/toluene (1:1.6) solution. The reaction mixture is stirred at room temperature for 2.5 hours, filtered and concentrated in vacuo to obtain an orange liquid. The liquid is vacuum distilled to give the title product as a colorless liquid, bp 121°-124° C. at 3 mm Hg. filtered concentrated in vacuo to obtain an orange liquid distilled

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

Procedure: A warm solution of 2-aminoethanethiol (10.0 g, 0.130 mol) and triethylamine (36 mL, 0.260 mol) in chloroform is added over 5 minutes to a solution of ethyl 2,3-dibromopropionate (33.9 g, 0.130 mol) in a chloroform/toluene (1:1.6) solution. The reaction mixture is stirred at room temperature for 2.5 hours, filtered and concentrated in vacuo to obtain an orange liquid. The liquid is vacuum distilled to give the title product as a colorless liquid, bp 121°-124° C. at 3 mm Hg. filtered concentrated in vacuo to obtain an orange liquid distilled

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

Procedure: To a solution of thiomorpholin-3-ylcarboxylic acid ethyl ester (5.05 g) in methylene chloride (120 mL) were added dimethylaminopyridine (352 mg), triethylamine (4.9 mL) and 3-nitrobenzoyl chloride (5.62 g) in ice bath and then the mixture was stirred at room temperature overnight. 2N hydrochloric acid was added to the reaction mixture, which was extracted with methylene chloride. The extract was wash with a saturated aqueous sodium hydrogen carbonate solution and brine sequentially, dried over anhydrous magnesium sulfate and concentrated. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=2:1) to give the title compound (5.91 g) having the following physical data. was extracted with methylene chloride The extract was wash with a saturated aqueous sodium hydrogen carbonate solution and brine sequentially dried over anhydrous magnesium sulfate concentrated The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=2:1)

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

Procedure: To a solution of thiomorpholin-3-ylcarboxylic acid ethyl ester (5.05 g) in methylene chloride (120 mL) were added dimethylaminopyridine (352 mg), triethylamine (4.9 mL) and 3-nitrobenzoyl chloride (5.62 g) in ice bath and then the mixture was stirred at room temperature overnight. 2N hydrochloric acid was added to the reaction mixture, which was extracted with methylene chloride. The extract was wash with a saturated aqueous sodium hydrogen carbonate solution and brine sequentially, dried over anhydrous magnesium sulfate and concentrated. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=2:1) to give the title compound (5.91 g) having the following physical data. was extracted with methylene chloride The extract was wash with a saturated aqueous sodium hydrogen carbonate solution and brine sequentially dried over anhydrous magnesium sulfate concentrated The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=2:1)

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

Procedure: A warm solution of 2-aminoethanethiol (10.0 g, 0.130 mol) and triethylamine (36 mL, 0.260 mol) in chloroform is added over 5 minutes to a solution of ethyl 2,3-dibromopropionate (33.9 g, 0.130 mol) in a chloroform/toluene (1:1.6) solution. The reaction mixture is stirred at room temperature for 2.5 hours, filtered and concentrated in vacuo to obtain an orange liquid. The liquid is vacuum distilled to give the title product as a colorless liquid, bp 121°-124° C. at 3 mm Hg. filtered concentrated in vacuo to obtain an orange liquid distilled

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

Procedure: Methyl 6-chloro-5-nitronicotinate (1.1 g, 5.10 mmol) was added to ethyl thiomorpholine-3-carboxylate (2.0 g, 11.41 mmol) neat while stirring at room temperature. The viscous yellow reaction was heated to 90° C. for one hour and then allowed to cool back to room temperature. The reaction was diluted with dichloromethane (20 mL) and purified via column chromatography (220 g SiO2, 20-30% gradient, ethyl acetate in hexanes) to yield the title compound (1.71 g, 95%) as a yellow oil. [M+H] calc'd for C15H18N2O6S, 356. found, 356. The viscous yellow reaction was heated to 90° C. for one hour to cool back to room temperature purified via column chromatography (220 g SiO2, 20-30% gradient, ethyl acetate in hexanes)

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

Procedure: Methyl 6-chloro-5-nitronicotinate (1.1 g, 5.10 mmol) was added to ethyl thiomorpholine-3-carboxylate (2.0 g, 11.41 mmol) neat while stirring at room temperature. The viscous yellow reaction was heated to 90° C. for one hour and then allowed to cool back to room temperature. The reaction was diluted with dichloromethane (20 mL) and purified via column chromatography (220 g SiO2, 20-30% gradient, ethyl acetate in hexanes) to yield the title compound (1.71 g, 95%) as a yellow oil. [M+H] calc'd for C15H18N2O6S, 356. found, 356. The viscous yellow reaction was heated to 90° C. for one hour to cool back to room temperature purified via column chromatography (220 g SiO2, 20-30% gradient, ethyl acetate in hexanes)

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

Procedure: A warm solution of 2-aminoethanethiol (10.0 g, 0.130 mol) and triethylamine (36 mL, 0.260 mol) in chloroform is added over 5 minutes to a solution of ethyl 2,3-dibromopropionate (33.9 g, 0.130 mol) in a chloroform/toluene (1:1.6) solution. The reaction mixture is stirred at room temperature for 2.5 hours, filtered and concentrated in vacuo to obtain an orange liquid. The liquid is vacuum distilled to give the title product as a colorless liquid, bp 121°-124° C. at 3 mm Hg. filtered concentrated in vacuo to obtain an orange liquid distilled

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

Procedure: A warm solution of 2-aminoethanethiol (10.0 g, 0.130 mol) and triethylamine (36 mL, 0.260 mol) in chloroform is added over 5 minutes to a solution of ethyl 2,3-dibromopropionate (33.9 g, 0.130 mol) in a chloroform/toluene (1:1.6) solution. The reaction mixture is stirred at room temperature for 2.5 hours, filtered and concentrated in vacuo to obtain an orange liquid. The liquid is vacuum distilled to give the title product as a colorless liquid, bp 121°-124° C. at 3 mm Hg. filtered concentrated in vacuo to obtain an orange liquid distilled

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

Procedure: A warm solution of 2-aminoethanethiol (10.0 g, 0.130 mol) and triethylamine (36 mL, 0.260 mol) in chloroform is added over 5 minutes to a solution of ethyl 2,3-dibromopropionate (33.9 g, 0.130 mol) in a chloroform/toluene (1:1.6) solution. The reaction mixture is stirred at room temperature for 2.5 hours, filtered and concentrated in vacuo to obtain an orange liquid. The liquid is vacuum distilled to give the title product as a colorless liquid, bp 121°-124° C. at 3 mm Hg. filtered concentrated in vacuo to obtain an orange liquid distilled

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

Procedure: Seven grams of 3-carbethoxythiomorpholine and 6.5 g of 4-chlorophenyl isocyanate were added to 60 ml of hexanes containing 10 drops of triethylamine as a catalyst. A mild exothermic reaction took place as the reactants mixed. After the mixture cooled to room temperature, the precipitate was collected by filtration and recrystallized from a mixture of methylene chloride and ether to give 4 g of 3-carbethoxy-4-(4-chlorophenylaminocarbonyl)thiomorpholine, mp 152.5°-154.5° C. A mild exothermic reaction mixed the precipitate was collected by filtration recrystallized from a mixture of methylene chloride and ether