tert-butyl N-[(1S)-2-cyclohexyl-1-[(2S)-oxiran-2-yl]ethyl]carbamate

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

Procedure: tert-Butyl (1S)-2-(cyclohexyl)-1-[(2S)-oxiran-2-yl]ethylcarbamate (225 mg, 0.84 mmol) was refluxed with m-bromobenzylamine (380 mg, 2.0 mmol) in 7 mL of isopropanol under nitrogen for 2 h, the solvent was removed in vacuo, and the residue was dissolved in ethyl acetate. It was washed three times with small portions of 10% HCl, and the aqueous phases were back-extracted with ethyl acetate. The combined organic phases were washed with 1 N NaHCO3 and brine, dried over Na2SO4, and concentrated. The resulting oil (356 mg) was dissolved in 3 mL of dichloromethane and 2 mL of TFA and stirred for 1.5 h. It was concentrated, and by weight determined to contain 3 eq. of TFA. To this was added 2 mL of dry dimethylformamide (DMF) and 0.35 mL (3.2 mmol) of 4-methyl morpholine. To this was added a pre-mixed solution of 3-[(dipropylamino)carbonyl]-5-methylbenzoic acid (240 mg, 0.9 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC, 190 mg, 1 mmol), and 1-hydroxybenzotriazole hydrate (HOBT, 135 mg, 1 mmol) in 3 mL of dry DMF, which had been stirring together for 1.5 h. After 3 days the reaction was quenched with 1 N KH2PO4 and dissolved in ethyl acetate. The organic phase was washed with 1 N KH2PO4, 1 N NaHCO3 (2×) and brine, dried over Na2SO4, and concentrated. Chromatography over silica gel, eluting with 5% methanol (containing 1% NH4OH) in dichloromethane afforded 208 mg (0.32 mmol) of N1-[(1S,2R)-3-[(3-bromobenzyl)amino]-1-(cyclohexylmethyl)-2-hydroxypropyl]-5-methyl-N3,N3-dipropylisophthalamide hydrochloride (EXAMPLE SP-257) after formation of the salt with ethereal HCl: CI MS m/z 600 [M+H]+. the solvent was removed in vacuo the residue was dissolved in ethyl acetate It was washed three times with small portions of 10% HCl the aqueous phases were back-extracted with ethyl acetate The combined organic phases were washed with 1 N NaHCO3 and brine dried over Na2SO4 concentrated The resulting oil (356 mg) was dissolved in 3 mL of dichloromethane It was concentrated had been stirring together for 1.5 h After 3 days the reaction was quenched with 1 N KH2PO4 dissolved in ethyl acetate The organic phase was washed with 1 N KH2PO4, 1 N NaHCO3 (2×) and brine dried over Na2SO4 concentrated Chromatography over silica gel, eluting with 5% methanol (containing 1% NH4OH) in dichloromethane

Conditions: temp:-30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: tert-Butyl (1S)-2-(cyclohexyl)-1-[(2S)-oxiran-2-yl]ethylcarbamate (225 mg, 0.84 mmol) was refluxed with m-ethyl benzylamine (254 mg, 1.9 mmol) in 5 mL of isopropanol under nitrogen for 1.5 h, the solvent was removed in vacuo, and the residue was dissolved in ethyl acetate. It was washed three times with small portions of 10% HCl, and the aqueous phases were back-extracted with ethyl acetate. The combined organic phases were washed with 1 N NaHCO3 and brine, dried over Na2SO4, and concentrated. The resulting oil (300 mg) was dissolved in 2 mL of dichloromethane and 2 mL of TFA and stirred for 30 min. It was concentrated, and by weight determined to contain 4 eq. of TFA. This was dissolved in 2 mL of dry THF, and 0.4 mL (3.6 mmol) of 4-methyl morpholine was added. This was cooled to −30° C., and a mixture of 3-[(dipropylamino)carbonyl]-5-methylbenzoic acid (238 mg, 0.9 mmol) and CDI (165 mg, 1 mmol) in 3 mL of dry THF, which had previously been stirred together for 1 h at room temperature, was added. The mixture was allowed to warm to ambient temperature. After 3 days the reaction was quenched with 1 N KH2PO4 and dissolved in ethyl acetate. The organic phase was washed with 1 N KH2PO4, 1 N NaHCO3 (2×) and brine, dried over Na2SO4, and concentrated. Chromatography over silica gel, eluting with 4% to 10% methanol (containing 1% NH4OH) in dichloromethane afforded 124 mg (0.21 mmol) of N1-{(1S,2R)-1-(cyclohexylmethyl)-3-[(3-ethylbenzyl)amino]-2-hydroxypropyl}-5-methyl-N3,N3-dipropylisophthalamide hydrochloride (EXAMPLE SP-256) as a white solid after formation of the salt with ethereal HCl: CI MS m/z 550 [M+H]+. the solvent was removed in vacuo the residue was dissolved in ethyl acetate It was washed three times with small portions of 10% HCl the aqueous phases were back-extracted with ethyl acetate The combined organic phases were washed with 1 N NaHCO3 and brine dried over Na2SO4 concentrated The resulting oil (300 mg) was dissolved in 2 mL of dichloromethane It was concentrated had previously been stirred together for 1 h at room temperature was added to warm to ambient temperature After 3 days the reaction was quenched with 1 N KH2PO4 dissolved in ethyl acetate The organic phase was washed with 1 N KH2PO4, 1 N NaHCO3 (2×) and brine dried over Na2SO4 concentrated Chromatography over silica gel, eluting with 4% to 10% methanol (containing 1% NH4OH) in dichloromethane

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: tert-Butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (492 mg, 1.82 mmol), sodium azide (600 mg, 9.2 mmol), and ammonium chloride (540 mg, 10 mmol) were dissolved in MeOH (26 mL). The reaction was heated to 70° C. for 15 h. The solution was cooled to rt and quenched with water (80 mL). The solution was extracted with EtOAc (3×). The combined organic layers were washed with brine, dried over MgSO4, and the solvent was removed. The crude (2R,3S)-3-amino-1-azido-4-cyclohexylbutan-2-ol (524 mg) was used without further purification. The solution was cooled to rt quenched with water (80 mL) The solution was extracted with EtOAc (3×) The combined organic layers were washed with brine dried over MgSO4 the solvent was removed The crude (2R,3S)-3-amino-1-azido-4-cyclohexylbutan-2-ol (524 mg) was used without further purification

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: tert-Butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (492 mg, 1.82 mmol), sodium azide (600 mg, 9.2 mmol), and ammonium chloride (540 mg, 10 mmol) were dissolved in MeOH (26 mL). The reaction was heated to 70° C. for 15 h. The solution was cooled to rt and quenched with water (80 mL). The solution was extracted with EtOAc (3×). The combined organic layers were washed with brine, dried over MgSO4, and the solvent was removed. The crude (2R,3S)-3-amino-1-azido-4-cyclohexylbutan-2-ol (524 mg) was used without further purification. The solution was cooled to rt quenched with water (80 mL) The solution was extracted with EtOAc (3×) The combined organic layers were washed with brine dried over MgSO4 the solvent was removed The crude (2R,3S)-3-amino-1-azido-4-cyclohexylbutan-2-ol (524 mg) was used without further purification

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

Procedure: To a solution of tert-butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (67.3 mg, 0.25 mmol) in CH3CN (8 mL) was added 4-cyanobenzylamine (39.6 mg, 0.3 mmol) and the mixture was heated under reflux overnight. The solvent was removed in vacuo and the residue was purified by the preparative HPLC to give tert-butyl (2S,3R)-4-(4-cyanobenzylamino)-1-cyclohexyl-3-hydroxybutan-2-ylcarbamate (58 mg, 58%). 1H NMR: 0.82 (m, 1H), 0.95 (m, 1H), 1.10-1.48 (m, 5H), 1.45 (s, 9H), 1.55-1.68 (m, 5H), 1.76 (m, 1H), 2.65 (m, 2H), 3.46 (m, 1H), 3.85 (m, 2H), 4.49 (m, 1H), 7.42 (d, 2H), 7.59 (d, 2H). MS (E/Z): 402 (M+H+). the mixture was heated under reflux overnight The solvent was removed in vacuo the residue was purified by the preparative HPLC

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

Procedure: To a solution of tert-butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (67.3 mg, 0.25 mmol) in CH3CN (8 mL) was added 4-cyanobenzylamine (39.6 mg, 0.3 mmol) and the mixture was heated under reflux overnight. The solvent was removed in vacuo and the residue was purified by the preparative HPLC to give tert-butyl (2S,3R)-4-(4-cyanobenzylamino)-1-cyclohexyl-3-hydroxybutan-2-ylcarbamate (58 mg, 58%). 1H NMR: 0.82 (m, 1H), 0.95 (m, 1H), 1.10-1.48 (m, 5H), 1.45 (s, 9H), 1.55-1.68 (m, 5H), 1.76 (m, 1H), 2.65 (m, 2H), 3.46 (m, 1H), 3.85 (m, 2H), 4.49 (m, 1H), 7.42 (d, 2H), 7.59 (d, 2H). MS (E/Z): 402 (M+H+). the mixture was heated under reflux overnight The solvent was removed in vacuo the residue was purified by the preparative HPLC

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

Procedure: To a solution of tert-butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (67.3 mg, 0.25 mmol) in CH3CN (8 mL) was added 3,5-dimethoxybenzylamine (50 mg, 0.3 mmol) and the mixture was heated under reflux overnight. The solvent was removed in vacuo and the residue was purified by the preparative HPLC to give tert-butyl (2S,3R)-1-cyclohexyl-4-(3,5-dimethoxybenzylamino)-3-hydroxybutan-2-ylcarbamate (66.5 mg, 61%). 1H NMR: 0.82 (m, 1H), 0.95 (m, 1H), 1.10-1.48 (m, 6H), 1.42 (s, 9H), 1.65 (m, 4H), 1.80 (m, 1H), 2.67 (m, 2H), 3.46 (m, 1H), 3.64 (m, 1H), 3.72 (d, 2H), 3.79 (s, 6H), 6.35 (m, 1H). MS (E/Z): 437 (M+H+). the mixture was heated under reflux overnight The solvent was removed in vacuo the residue was purified by the preparative HPLC

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

Procedure: To a solution of tert-butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (67.3 mg, 0.25 mmol) in CH3CN (8 mL) was added 3,5-dimethoxybenzylamine (50 mg, 0.3 mmol) and the mixture was heated under reflux overnight. The solvent was removed in vacuo and the residue was purified by the preparative HPLC to give tert-butyl (2S,3R)-1-cyclohexyl-4-(3,5-dimethoxybenzylamino)-3-hydroxybutan-2-ylcarbamate (66.5 mg, 61%). 1H NMR: 0.82 (m, 1H), 0.95 (m, 1H), 1.10-1.48 (m, 6H), 1.42 (s, 9H), 1.65 (m, 4H), 1.80 (m, 1H), 2.67 (m, 2H), 3.46 (m, 1H), 3.64 (m, 1H), 3.72 (d, 2H), 3.79 (s, 6H), 6.35 (m, 1H). MS (E/Z): 437 (M+H+). the mixture was heated under reflux overnight The solvent was removed in vacuo the residue was purified by the preparative HPLC

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

Procedure: tert-Butyl (2S,3S)-4-chloro-1-cyclohexyl-3-hydroxybutan-2-ylcarbamate (1 g, 3.28 mmol) was dissolved in a solution of 0.71 N NaOH in EtOH (5.6 mL, 3.95 mmol, 1.2 eq). After stirring for 1 h, the mixture was concentrated to give a residue, which was dissolved in water and extracted with EtOAc (3×15 mL). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo to give tert-butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (0.84 g, 95%). 1H NMR: 0.83 (m, 1H), 0.95 (m, 1H), 1.10-1.42 (m, 5H), 1.45 (s, 9H), 1.68 (m, 5H), 1.76 (m, 1H), 2.72 (m, 2H), 2.83 (m, 1H), 3.55 (m, 1H), 4.38 (m, 1H). MS (E/Z): 270 (M+H+). the mixture was concentrated to give a residue, which extracted with EtOAc (3×15 mL) The combined organic layers were washed with brine dried over Na2SO4 filtered concentrated in vacuo

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

Procedure: tert-Butyl (2S,3S)-4-chloro-1-cyclohexyl-3-hydroxybutan-2-ylcarbamate (1 g, 3.28 mmol) was dissolved in a solution of 0.71 N NaOH in EtOH (5.6 mL, 3.95 mmol, 1.2 eq). After stirring for 1 h, the mixture was concentrated to give a residue, which was dissolved in water and extracted with EtOAc (3×15 mL). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo to give tert-butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (0.84 g, 95%). 1H NMR: 0.83 (m, 1H), 0.95 (m, 1H), 1.10-1.42 (m, 5H), 1.45 (s, 9H), 1.68 (m, 5H), 1.76 (m, 1H), 2.72 (m, 2H), 2.83 (m, 1H), 3.55 (m, 1H), 4.38 (m, 1H). MS (E/Z): 270 (M+H+). the mixture was concentrated to give a residue, which extracted with EtOAc (3×15 mL) The combined organic layers were washed with brine dried over Na2SO4 filtered concentrated in vacuo

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

Procedure: To a solution of tert-butyl (S)-2-cyclohexyl-1-((S)-oxiran-2-yl)ethylcarbamate (0.63 g, 2.5 mmol) and triethylamine (0.65 mL, 5 mmol) in methanol (15 mL) was added Pd/C (0.1 g), and the mixture was hydrogenated under 30 psi pressure at rt overnight. The mixture was filtered and the filtrate was concentrated to give tert-butyl (2S,3R)-1-cyclohexyl-3-hydroxybutan-2-ylcarbamate (0.44 g, 70%). 1H NMR (400 MHz, CDCl3): 4.48 (brs, 1H), 3.78 (m, 2H), 2.30 (brs, 1H), 1.82 (m, 1H), 1.66 (m, 4h), 1.45 (s, 9H), 1.40-1.00 (m, 6H), 1.10 (d, J=6.4 Hz, 3H), 1.00-0.70 (m, 2H); MS (E/Z): 272 (M+H+). The mixture was filtered the filtrate was concentrated

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

Procedure: tert-Butyl (1S)-2-(cyclohexyl)-1-[(2S)-oxiran-2-yl]ethylcarbamate (225 mg, 0.84 mmol) was refluxed with m-bromobenzylamine (380 mg, 2.0 mmol) in 7 mL of isopropanol under nitrogen for 2 h, the solvent was removed in vacuo, and the residue was dissolved in ethyl acetate. It was washed three times with small portions of 10% HCl, and the aqueous phases were back-extracted with ethyl acetate. The combined organic phases were washed with 1 N NaHCO3 and brine, dried over Na2SO4, and concentrated. The resulting oil (356 mg) was dissolved in 3 mL of dichloromethane and 2 mL of TFA and stirred for 1.5 h. It was concentrated, and by weight determined to contain 3 eq. of TFA. To this was added 2 mL of dry dimethylformamide (DMF) and 0.35 mL (3.2 mmol) of 4-methyl morpholine. To this was added a pre-mixed solution of 3-[(dipropylamino)carbonyl]-5-methylbenzoic acid (240 mg, 0.9 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC, 190 mg, 1 mmol), and 1-hydroxybenzotriazole hydrate (HOBT, 135 mg, 1 mmol) in 3 mL of dry DMF, which had been stirring together for 1.5 h. After 3 days the reaction was quenched with 1 N KH2PO4 and dissolved in ethyl acetate. The organic phase was washed with 1 N KH2PO4, 1 N NaHCO3 (2×) and brine, dried over Na2SO4, and concentrated. Chromatography over silica gel, eluting with 5% methanol (containing 1% NH4OH) in dichloromethane afforded 208 mg (0.32 mmol) of N1-[(1S,2R)-3-[(3-bromobenzyl)amino]-1-(cyclohexylmethyl)-2-hydroxypropyl]-5-methyl-N3,N3-dipropylisophthalamide hydrochloride (EXAMPLE SP-257) after formation of the salt with ethereal HCl: CI MS m/z 600 [M+H]+. the solvent was removed in vacuo the residue was dissolved in ethyl acetate It was washed three times with small portions of 10% HCl the aqueous phases were back-extracted with ethyl acetate The combined organic phases were washed with 1 N NaHCO3 and brine dried over Na2SO4 concentrated The resulting oil (356 mg) was dissolved in 3 mL of dichloromethane It was concentrated had been stirring together for 1.5 h After 3 days the reaction was quenched with 1 N KH2PO4 dissolved in ethyl acetate The organic phase was washed with 1 N KH2PO4, 1 N NaHCO3 (2×) and brine dried over Na2SO4 concentrated Chromatography over silica gel, eluting with 5% methanol (containing 1% NH4OH) in dichloromethane