2-(tert-butylamino)acetic acid

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: In a 5 L RB flask dissolved t-butyl glycine (74 g, 0.56 mol, 1.02 eq.) in saturated sodium bicarbonate (11 vol). Cyclopentyl 2,5-dioxopyrrolidin-1-yl carbonate (126 g, 0.55 mol, 1 eq.) was dissolved in acetone (5.5 vol) and the solution slowly added via addition funnel at room temperature to the solution of the glycine. The reaction mixture was stirred at room temperature until complete (approximately 4 hours). The acetone was removed under reduced pressure and the remaining aqueous solution was extracted with 30% ethyl acetate in hexanes (thrice, 5.5 vol each). The organic layers were discarded. The pH of the aqueous layer was adjusted to 2 with 2 N HCl and then extracted with ethyl acetate (thrice, 5.5 vol). The combined organic layers were dried (Na2SO4), filtered, and the solvent removed under reduced pressure to provide a clear oil the slowly crystallized. The crude product was crystallized from hexanes/ethyl acetate to provide (S)-2-(cyclopentyloxycarbonylamino)-3,3-dimethylbutanoic acid as a white solid (82 g). The mother liquid was stripped and a second crop of crystals obtained (combined yield 105.54 g). The acetone was removed under reduced pressure the remaining aqueous solution was extracted with 30% ethyl acetate in hexanes (thrice, 5.5 vol each) extracted with ethyl acetate (thrice, 5.5 vol) The combined organic layers were dried (Na2SO4) filtered the solvent removed under reduced pressure to provide a clear oil the slowly crystallized The crude product was crystallized from hexanes/ethyl acetate

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Gaertner, U.S. Pat. No. 3,927,080, describes the production of glyphosate by acid hydrolysis and dealkylation of N-t-butyl-N-phosphonomethylglycine or its esters. Tertiary butyl amine is reacted with a bromoacetate ester to produce an ester of N-t-butylglycine, which is in turn reacted with formaldehyde and phosphorous acid to produce the N-t-butyl-N-phosphonomethylglycine precursor.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of tert-Butylamino-acetic acid methyl ester (Maybridge), 122 mg (0.84 mmol) in 10 mL of dioxane was added a solution of 60 mg (2.52 mmol) of lithium hydroxide in 10 mL of water. The reaction mixture was stirred for two hours, acidified to pH=1 with 5 N HCl and concentrated to dryness to yield the crude desired product which was carried on without further purification. MS (IS) 132.1 (M+1). concentrated to dryness

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Gaertner, U.S. Pat. No. 3,927,080, describes the production of N-phosphonomethylglycine by acid-catalyzed dealkylation of N-t-butyl-N-phosphonomethylglycine or its esters. Tertiary butylamine is reacted with a bromoacetate ester to produce an ester of N-t-butylglycine which is in turn reacted with formaldehyde and phosphorous acid to produce the N-t-butyl-N-phosphonomethylglycine precursor.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: In a 5 L R flask dissolved t-butyl glycine (74 g, 0.56 mol, 1.02 eq.) in saturated sodium bicarbonate (11 vol). Cyclopentyl 2,5-dioxopyrrolidin-1-yl carbonate (126 g, 0.55 mol, 1 eq.) was dissolved in acetone (5.5 vol) and the solution slowly added via addition funnel at room temperature to the solution of the glycine. The reaction mixture was stirred at room temperature until complete (approximately 4 hours). The acetone was removed under reduced pressure and the remaining aqueous solution was extracted with 30% ethyl acetate in hexanes (thrice, 5.5 vol each). The organic layers were discarded. The pH of the aqueous layer was adjusted to 2 with 2 N HCl and then extracted with ethyl acetate (thrice, 5.5 vol). The combined organic layers were dried (Na2SO4), filtered, and the solvent removed under reduced pressure to provide a clear oil the slowly crystallized. The crude product was crystallized from hexanes/ethyl acetate to provide (S)-2-(cyclopentyloxycarbonylamino)-3,3-dimethylbutanoic acid as a white solid (82 g). The mother liquid was stripped and a second crop of crystals obtained (combined yield 105.54 g, 79% yield). The acetone was removed under reduced pressure the remaining aqueous solution was extracted with 30% ethyl acetate in hexanes (thrice, 5.5 vol each) extracted with ethyl acetate (thrice, 5.5 vol) The combined organic layers were dried (Na2SO4) filtered the solvent removed under reduced pressure to provide a clear oil the slowly crystallized The crude product was crystallized from hexanes/ethyl acetate

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: In a 5 L R flask dissolved t-butyl glycine (74 g, 0.56 mol, 1.02 eq.) in saturated sodium bicarbonate (11 vol). Cyclopentyl 2,5-dioxopyrrolidin-1-yl carbonate (126 g, 0.55 mol, 1 eq.) was dissolved in acetone (5.5 vol) and the solution slowly added via addition funnel at room temperature to the solution of the glycine. The reaction mixture was stirred at room temperature until complete (approximately 4 hours). The acetone was removed under reduced pressure and the remaining aqueous solution was extracted with 30% ethyl acetate in hexanes (thrice, 5.5 vol each). The organic layers were discarded. The pH of the aqueous layer was adjusted to 2 with 2 N HCl and then extracted with ethyl acetate (thrice, 5.5 vol). The combined organic layers were dried (Na2SO4), filtered, and the solvent removed under reduced pressure to provide a clear oil the slowly crystallized. The crude product was crystallized from hexanes/ethyl acetate to provide (S)-2-(cyclopentyloxycarbonylamino)-3,3-dimethylbutanoic acid as a white solid (82 g). The mother liquid was stripped and a second crop of crystals obtained (combined yield 105.54 g, 79% yield). The acetone was removed under reduced pressure the remaining aqueous solution was extracted with 30% ethyl acetate in hexanes (thrice, 5.5 vol each) extracted with ethyl acetate (thrice, 5.5 vol) The combined organic layers were dried (Na2SO4) filtered the solvent removed under reduced pressure to provide a clear oil the slowly crystallized The crude product was crystallized from hexanes/ethyl acetate

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Gaertner, U.S. Pat. No. 3,927,080, describes the production of glyphosate by the acid hydrolysis of N-t-butyl-N-phosphonomethylglycine or its esters. Tertiary butylamine is reacted with a bromoacetate ester to produce an ester of N-t-butylglycine which is in turn reacted with formaldehyde and phosphorous acid to produce the N-t-butyl-N-phosphonomethylglycine precursor.