tert-butyl N-(2-oxoethyl)-N-(2-phenylethyl)carbamate

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dissolve N-t-butoxycarbonyl-N-allyl-2-phenyl-ethylamine (7.88 g, 21.44 mmol) in dichloromethane (200 mL) and methanol (5 mL). Cool to -78° C. Pass ozonized oxygen through the solution until a persistent light blue color is obtained. Pass nitrogen through the solution until the blue color dissipates. Add dimethyl sulfide (20 mL). Allow the reaction mixture to warm to ambient temperature and stir for 5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo to give the title compound. is obtained to warm to ambient temperature Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.10 g, 19.16 mmol) and (S)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((S)-tryptophan methyl ester hydrochloride salt) (4.90 g, 19.23 mmol) in methanol (50 mL) and stir for 10 minutes. Add sodium cyanoborohydride in solution (19.0 mL, 1M in THF, 19.0 mmol) and stir under an inert atmosphere for 18 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.03 g, 19.0 mmol) and (R)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((R)-tryptophan methyl ester hydrochloride salt) (4.9 g, 19.42 mmol) in methanol (50 mL) and stir for 30 minutes. Add sodium cyanoborohydride in solution (15.0 mL, 1M in THF, 15.0 mmol) and stir under an inert atmosphere for 16.5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dissolve N-t-butoxycarbonyl-N-allyl-2-phenyl-ethylamine (7.88 g, 21.44 mmol) in dichloromethane (200 mL) and methanol (5 mL). Cool to -78° C. Pass ozonized oxygen through the solution until a persistent light blue color is obtained. Pass nitrogen through the solution until the blue color dissipates. Add dimethyl sulfide (20 mL). Allow the reaction mixture to warm to ambient temperature and stir for 5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo to give the title compound. is obtained to warm to ambient temperature Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.10 g, 19.16 mmol) and (S)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((S)-tryptophan methyl ester hydrochloride salt) (4.90 g, 19.23 mmol) in methanol (50 mL) and stir for 10 minutes. Add sodium cyanoborohydride in solution (19.0 mL, 1M in THF, 19.0 mmol) and stir under an inert atmosphere for 18 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.03 g, 19.0 mmol) and (R)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((R)-tryptophan methyl ester hydrochloride salt) (4.9 g, 19.42 mmol) in methanol (50 mL) and stir for 30 minutes. Add sodium cyanoborohydride in solution (15.0 mL, 1M in THF, 15.0 mmol) and stir under an inert atmosphere for 16.5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dissolve N-t-butoxycarbonyl-N-allyl-2-phenyl-ethylamine (7.88 g, 21.44 mmol) in dichloromethane (200 mL) and methanol (5 mL). Cool to -78° C. Pass ozonized oxygen through the solution until a persistent light blue color is obtained. Pass nitrogen through the solution until the blue color dissipates. Add dimethyl sulfide (20 mL). Allow the reaction mixture to warm to ambient temperature and stir for 5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo to give the title compound. is obtained to warm to ambient temperature Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.10 g, 19.16 mmol) and (S)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((S)-tryptophan methyl ester hydrochloride salt) (4.90 g, 19.23 mmol) in methanol (50 mL) and stir for 10 minutes. Add sodium cyanoborohydride in solution (19.0 mL, 1M in THF, 19.0 mmol) and stir under an inert atmosphere for 18 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.03 g, 19.0 mmol) and (R)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((R)-tryptophan methyl ester hydrochloride salt) (4.9 g, 19.42 mmol) in methanol (50 mL) and stir for 30 minutes. Add sodium cyanoborohydride in solution (15.0 mL, 1M in THF, 15.0 mmol) and stir under an inert atmosphere for 16.5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.03 g, 19.0 mmol) and (R)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((R)-tryptophan methyl ester hydrochloride salt) (4.9 g, 19.42 mmol) in methanol (50 mL) and stir for 30 minutes. Add sodium cyanoborohydride in solution (15.0 mL, 1M in THF, 15.0 mmol) and stir under an inert atmosphere for 16.5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Dissolve N-t-butoxycarbonyl-N-allyl-2-phenyl-ethylamine (7.88 g, 21.44 mmol) in dichloromethane (200 mL) and methanol (5 mL). Cool to -78° C. Pass ozonized oxygen through the solution until a persistent light blue color is obtained. Pass nitrogen through the solution until the blue color dissipates. Add dimethyl sulfide (20 mL). Allow the reaction mixture to warm to ambient temperature and stir for 5 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo to give the title compound. is obtained to warm to ambient temperature Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo

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

Procedure: Combine N-t-butoxycarbonyl-N-(2-oxo-ethyl)-2-phenyl-ethylamine (5.10 g, 19.16 mmol) and (S)-2-(1H-indol-3-yl)-1-carboxymethyl-ethylamine hydrochloride salt ((S)-tryptophan methyl ester hydrochloride salt) (4.90 g, 19.23 mmol) in methanol (50 mL) and stir for 10 minutes. Add sodium cyanoborohydride in solution (19.0 mL, 1M in THF, 19.0 mmol) and stir under an inert atmosphere for 18 hours. Concentrate in vacuo to obtain a residue. Dilute the residue with ethyl acetate and extract with water. Separate the layers, dry the organic layer over MgSO4, filter, and evaporate in vacuo. Chromatograph on silica gel eluting with 50% ethyl acetate/hexane to give the title compound. Concentrate in vacuo to obtain a residue extract with water Separate the layers dry the organic layer over MgSO4 filter evaporate in vacuo