methyl 2-dimethoxyphosphoryl-2-(phenylmethoxycarbonylamino)acetate

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: A solution of 1,4-dioxaspiro[4.5]decan-8-one (15 g, 96 mmol) in EtOAc (150 mL) was added to a solution of methyl 2-(benzyloxycarbonylamino)-2-(dimethoxyphosphoryl)acetate (21.21 g, 64.0 mmol) in 1,1,3,3-tetramethylguanidine (10.45 mL, 83 mmol) and EtOAc (150 mL). The resulting solution was the stirred at ambient temperature for 72 h and then it was diluted with EtOAc (25 mL). The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL), dried (MgSO4), filtered and concentrated. The residue was purified via BIOTAGE® (5% to 25% EtOAc/Hexanes; 300 g column). The combined fractions containing the product were then concentrated under vacuum and the residue was re-crystallized from hexanes/EtOAc to give white crystals that corresponded to methyl 2-(benzyloxycarbonylamino)-2-(1,4-dioxaspiro[4.5]decan-8-ylidene)acetate (6.2 g) 1H NMR (400 MHz, CDCl3-d) δ ppm 7.30-7.44 (5H, m), 6.02 (1H, br. s.), 5.15 (2H, s), 3.97 (4H, s), 3.76 (3H, br. s.), 2.84-2.92 (2H, m), 2.47 (2H, t, J=6.40 Hz), 1.74-1.83 (4H, m). LC (Cond. OL1): Rt=2.89 min. LC-MS: Anal. Calcd. for [M+Na]+ C19H23NNaO6: 745.21. found: 745.47. The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL) dried (MgSO4) filtered concentrated The residue was purified via BIOTAGE® (5% to 25% EtOAc/Hexanes; 300 g column) The combined fractions containing the product were then concentrated under vacuum the residue was re-crystallized from hexanes/EtOAc

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: A solution of 1,4-dioxaspiro[4.5]decan-8-one (15 g, 96 mmol) in EtOAc (150 mL) was added to a solution of methyl 2-(benzyloxycarbonylamino)-2-(dimethoxyphosphoryl)acetate (21.21 g, 64.0 mmol) in 1,1,3,3-tetramethylguanidine (10.45 mL, 83 mmol) and EtOAc (150 mL). The resulting solution was the stirred at ambient temperature for 72 h and then it was diluted with EtOAc (25 mL). The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL), dried (MgSO4), filtered and concentrated. The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column). The combined fractions containing the product were then concentrated under vacuum and the residue was re-crystallized from hexanes/EtOAc to give white crystals that corresponded to methyl 2-(benzyloxycarbonylamino)-2-(1,4-dioxaspiro[4.5]decan-8-ylidene)acetate (6.2 g) 1H NMR (400 MHz, CDCl3-d) δ ppm 7.30-7.44 (5 H, m), 6.02 (1 H, br. s.), 5.15 (2 H, s), 3.97 (4 H, s), 3.76 (3 H, br. s.), 2.84-2.92 (2 H, m), 2.47 (2 H, t, J=6.40 Hz), 1.74-1.83 (4 H, m). LC (Cond. OL1): Rt=2.89 min. LC/MS: Anal. Calcd. For [M+N]+ C19H23NNaO6: 745.21; found: 745.47. The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL) dried (MgSO4) filtered concentrated The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column) The combined fractions containing the product were then concentrated under vacuum the residue was re-crystallized from hexanes/EtOAc

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

実験手順: A solution of 1,4-dioxaspiro[4.5]decan-8-one (15 g, 96 mmol) in EtOAc (150 mL) was added to a solution of methyl 2-(benzyloxycarbonylamino)-2-(dimethoxyphosphoryl)acetate (21.21 g, 64.0 mmol) in 1,1,3,3-tetramethylguanidine (10.45 mL, 83 mmol) and EtOAc (150 mL). The resulting solution was the stirred at ambient temperature for 72 h and then it was diluted with EtOAc (25 mL). The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL), dried (MgSO4), filtered and concentrated. The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column). The combined fractions containing the product were then concentrated under vacuum and the residue was re-crystallized from hexanes/EtOAc to give white crystals that corresponded to methyl 2-(benzyloxycarbonylamino)-2-(1,4-dioxaspiro[4.5]decan-8-ylidene)acetate (6.2 g) 1H NMR (400 MHz, CDCl3-d) δ ppm 7.30-7.44 (5H, m), 6.02 (1H, br. s.), 5.15 (2H, s), 3.97 (4H, s), 3.76 (3H, br. s.), 2.84-2.92 (2H, m), 2.47 (2H, t, J=6.40 Hz), 1.74-1.83 (4H, m). LC (Cond. OL1): Rt=2.89 min. LC/MS: Anal. Calcd. For [M+Na]+ C19H23NNaO6: 745.21. found: 745.47 The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL) dried (MgSO4) filtered concentrated The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column) The combined fractions containing the product were then concentrated under vacuum the residue was re-crystallized from hexanes/EtOAc

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

実験手順: A solution of 1,4-dioxaspiro[4.5]decan-8-one (15 g, 96 mmol) in EtOAc (150 mL) was added to a solution of methyl 2-(benzyloxycarbonylamino)-2-(dimethoxyphosphoryl)acetate (21.21 g, 64.0 mmol) in 1,1,3,3-tetramethylguanidine (10.45 mL, 83 mmol) and EtOAc (150 mL). The resulting solution was the stirred at ambient temperature for 72 h and then it was diluted with EtOAc (25 mL). The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL), dried (MgSO4), filtered and concentrated. The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column). The combined fractions containing the product were then concentrated under vacuum and the residue was re-crystallized from hexanes/EtOAc to give white crystals that corresponded to methyl 2-(benzyloxycarbonylamino)-2-(1,4-dioxaspiro[4.5]decan-8-ylidene)acetate (6.2 g) 1H NMR (400 MHz, CDCl3-d) δ ppm 7.30-7.44 (5 H, m), 6.02 (1 H, br. s.), 5.15 (2 H, s), 3.97 (4 H, s), 3.76 (3 H, br. s.), 2.84-2.92 (2 H, m), 2.47 (2 H, t, J=6.40 Hz), 1.74-1.83 (4 H, m). LC (Cond, OL1): Rt=2.89 min. LC/MS: Anal. Calcd. For [M+Na]+ C19H23NNaO6: 745.21; found: 745.47. The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL) dried (MgSO4) filtered concentrated The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column) The combined fractions containing the product were then concentrated under vacuum the residue was re-crystallized from hexanes/EtOAc

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

実験手順: A solution of 1,4-dioxaspiro[4.5]decan-8-one (15 g, 96 mmol) in EtOAc (150 mL) was added to a solution of methyl 2-(benzyloxycarbonylamino)-2-(dimethoxyphosphoryl)acetate (21.21 g, 64.0 mmol) in 1,1,3,3-tetramethylguanidine (10.45 mL, 83 mmol) and EtOAc (150 mL). The resulting solution was the stirred at ambient temperature for 72 h and then it was diluted with EtOAc (25 mL). The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL), dried (MgSO4), filtered and concentrated. The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column). The combined fractions containing the product were then concentrated under vacuum and the residue was re-crystallized from hexanes/EtOAc to give white crystals that corresponded to methyl 2-(benzyloxycarbonylamino)-2-(1,4-dioxaspiro[4.5]decan-8-ylidene)acetate (6.2 g) 1H NMR (400 MHz, CDCl3-d) δ ppm 7.30-7.44 (5 H, m), 6.02 (1 H, br. s.), 5.15 (2 H, s), 3.97 (4 H, s), 3.76 (3 H, br. s.), 2.84-2.92 (2 H, m), 2.47 (2 H, t, J=6.40 Hz), 1.74-1.83 (4 H, m). LC (Cond, OL1): Rt=2.89 min. LC/MS: Anal. Calcd. For [M+Na]+ C19H23NNaO6: 745.21; found: 745.47. The organic layer was washed with 1N HCl (75 mL), H2O (100 mL) and brine (100 mL) dried (MgSO4) filtered concentrated The residue was purified via Biotage (5% to 25% EtOAc/Hexanes; 300 g column) The combined fractions containing the product were then concentrated under vacuum the residue was re-crystallized from hexanes/EtOAc

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

実験手順: A well stirred solution of 3,5-difluorobenzaldehyde (1.92 g, 13.5 mmol) and methyl benzyloxycarbonylamino-(dimethoxyphosphoryl)acetate (5.37 g, 16.2 mmol) in dry THF (20 mL), under N2, was cooled to 0° C. and 1,1,3,3-tetramethylgaunidine (1.38 g, 16.2 mmol) added via syringe. The reaction was allowed to warm to rt and stir for 6 h, quenched with saturated ammonium chloride and extracted with ethyl acetate. After concentration, the residue was chromatographed on silica gel (elution with 20% ethyl acetate/heptane) to give methyl (Z)-2-benzyloxycarbonylamino-3-phenyl-acrylate (3.55 g) as a white solid. MS (ESI+) for C18H15F2NO4 m/z 348.2 (M+H)+. quenched with saturated ammonium chloride extracted with ethyl acetate After concentration the residue was chromatographed on silica gel (elution with 20% ethyl acetate/heptane)

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

実験手順: A well stirred solution of 3,5-difluorobenzaldehyde (1.92 g, 13.5 mmol) and methyl benzyloxycarbonylamino-(dimethoxyphosphoryl)acetate (5.37 g, 16.2 mmol) in dry THF (20 mL), under N2, was cooled to 0° C. and 1,1,3,3-tetramethylgaunidine (1.38 g, 16.2 mmol) added via syringe. The reaction was allowed to warm to rt and stir for 6 h, quenched with saturated ammonium chloride and extracted with ethyl acetate. After concentration, the residue was chromatographed on silica gel (elution with 20% ethyl acetate/heptane) to give methyl (Z)-2-benzyloxycarbonylamino-3-phenyl-acrylate (3.55 g) as a white solid. MS (ESI+) for C18H15F2NO4 m/z 348.2 (M+H)+. quenched with saturated ammonium chloride extracted with ethyl acetate After concentration the residue was chromatographed on silica gel (elution with 20% ethyl acetate/heptane)

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

実験手順: N-(Benzyloxycarbonyl)-α-phosphonoglycine trimethyl ester (2 g, 6.0 mmol, 1.0 equiv) was dissolved in dry THF (20 mL). tert-Butylacetaldehyde (0.758 mL, 6.0 mmol, 1.0 equiv) and DBU (0.903 mL, 6.0 mmol, 1.0 equiv) were added and the reaction mixture was stirred for 16 h. The solution was diluted with 100 mL of CH2Cl2 and washed with 1×50 mL water, and 1×50 mL brine. The organic layer was dried over Na2SO4, decanted and concentrated in vacuo to provide 2-benzyloxycarbonylamino-5,5-dimethyl-hex-2-enoic acid methyl ester as a thick oil (1.73 g, 94%) which was used without further purification; MS: 306 (M+1). washed with 1×50 mL water, and 1×50 mL brine The organic layer was dried over Na2SO4 decanted concentrated in vacuo

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

実験手順: N-(Benzyloxycarbonyl)-α-phosphonoglycine trimethyl ester (2 g, 6.0 mmol, 1.0 equiv) was dissolved in dry THF (20 mL). tert-Butylacetaldehyde (0.758 mL, 6.0 mmol, 1.0 equiv) and DBU (0.903 mL, 6.0 mmol, 1.0 equiv) were added and the reaction mixture was stirred for 16 h. The solution was diluted with 100 mL of CH2Cl2 and washed with 1×50 mL water, and 1×50 mL brine. The organic layer was dried over Na2SO4, decanted and concentrated in vacuo to provide 2-benzyloxycarbonylamino-5,5-dimethyl-hex-2-enoic acid methyl ester as a thick oil (1.73 g, 94%) which was used without further purification; MS: 306 (M+1). washed with 1×50 mL water, and 1×50 mL brine The organic layer was dried over Na2SO4 decanted concentrated in vacuo