N-(tert-Butoxycarbonyl)-L-cysteine methyl ester

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

Procedure: Prepared in 60% (333 mg) yield as described in general procedure (D) using trans-3-(5-bromo-thiazol-2-yl)-1-cyclohexyl-1-(4-methyl-cyclohexyl)-urea (400 mg, 1.0 mmol) and N-(tert-butoxycarbonyl)-L-cysteine methyl ester (470 mg, 2.0 mmol). Prepared in 60% (333 mg) yield

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

Procedure: Prepared in 60% (333 mg) yield as described in general procedure (D) using trans-3-(5-bromo-thiazol-2-yl)-1-cyclohexyl-1-(4-methyl-cyclohexyl)-urea (400 mg, 1.0 mmol) and N-(tert-butoxycarbonyl)-L-cysteine methyl ester (470 mg, 2.0 mmol). Prepared in 60% (333 mg) yield

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

Procedure: A mixture of 4′-Bromo-4-bromomethyl-biphenyl, 9.1 g (27.9 mmol), N-(tert-Butoxy-carbonyl)-L-cysteine methyl ester, 5.74 mL (27.9 mmol), cesium carbonate, 18.2 g (55.8 mmol), and 100 mL of N,N-dimethylformamide was stirred at room temperature for 4 h. The mixture was diluted with 200 mL of water and extracted with 2×200 mL of ethyl acetate. The organic layer was washed with 2×200 mL portions of aq. LiCl, sat. aq. NaHCO3, sat. aq. NaCl, and dried (MgSO4). After the solution was concentrated, the residue was purified through a short plug of silica gel (eluted with 20% EtOAc-Heptane) to afford the desired product in 8.8 g (66%) as a white solid. 1H NMR (CDCl3) 7.55 (d, 2H, J=9.3 Hz), 7.50 (d, 2H, J=9.0 Hz), 7.43 (d, 2H, J=9.3 Hz), 7.37 (d, 2H, J=9.0 Hz), 5.31 (d, 1H, J=9.0 Hz), 4.62-4.51 (m, 1H), 3.76 (s, 5H), 2.93 (dd, 1H, 15.7, 5.7 Hz), 2.84 (dd, 1H, 15.7, 6.3 Hz), 1.47 (s, 9H). extracted with 2×200 mL of ethyl acetate The organic layer was washed with 2×200 mL portions of aq. LiCl, sat. aq. NaHCO3, sat. aq. NaCl dried (MgSO4) After the solution was concentrated the residue was purified through a short plug of silica gel (eluted with 20% EtOAc-Heptane)

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

Procedure: A mixture of 4′-Bromo-4-bromomethyl-biphenyl, 9.1 g (27.9 mmol), N-(tert-Butoxy-carbonyl)-L-cysteine methyl ester, 5.74 mL (27.9 mmol), cesium carbonate, 18.2 g (55.8 mmol), and 100 mL of N,N-dimethylformamide was stirred at room temperature for 4 h. The mixture was diluted with 200 mL of water and extracted with 2×200 mL of ethyl acetate. The organic layer was washed with 2×200 mL portions of aq. LiCl, sat. aq. NaHCO3, sat. aq. NaCl, and dried (MgSO4). After the solution was concentrated, the residue was purified through a short plug of silica gel (eluted with 20% EtOAc-Heptane) to afford the desired product in 8.8 g (66%) as a white solid. 1H NMR (CDCl3) 7.55 (d, 2H, J=9.3 Hz), 7.50 (d, 2H, J=9.0 Hz), 7.43 (d, 2H, J=9.3 Hz), 7.37 (d, 2H, J=9.0 Hz), 5.31 (d, 1H, J=9.0 Hz), 4.62-4.51 (m, 1H), 3.76 (s, 5H), 2.93 (dd, 1H, 15.7, 5.7 Hz), 2.84 (dd, 1H, 15.7, 6.3 Hz), 1.47 (s, 9H). extracted with 2×200 mL of ethyl acetate The organic layer was washed with 2×200 mL portions of aq. LiCl, sat. aq. NaHCO3, sat. aq. NaCl dried (MgSO4) After the solution was concentrated the residue was purified through a short plug of silica gel (eluted with 20% EtOAc-Heptane)

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

Procedure: A mixture of Methanesulfonic acid 4-(4,6-diphenylpyrimidin-2-yl)-benzyl ester, 0.15 g (0.36 mmol), N-(tert-Butoxycarbonyl)-L-cysteine methyl ester, 0.08 mL (0.36 mmol), cesium carbonate, 235 mg (0.72 mmol), and 10 mL of N,N-dimethylformamide was stirred at room temperature for 4 h. The mixture was diluted with 10 mL of water and extracted with 2×50 mL of ethyl acetate. The organic layer was washed with 2×50 mL portions of aq. LiCl, sat. aq. NaHCO3, sat. aq. NaCl, and dried (MgSO4). After the solution was concentrated, the residue was purified by column chromatography (eluted with 7% EtOAc-Heptane) to afford the desired product in 0.18 g (90%) as a white solid. 1H NMR (CDCl3) 8.67 (d, 2H, J=9.0 Hz), 8.30-8.27 (m, 4H), 8.02 (s, 1H), 7.61-7.55 (m, 6H), 7.47 (d, 2H, J=9.0 Hz), 5.30 (d, 1H, J=7.7 Hz), 4.63-4.52 (m, 1H), 3.82 (s, 2H), 3.76 (s, 3H), 2.93 (dd, 1H, J=15.7, 6.0 Hz), 2.84 (dd, 1H, J=15.7, 6.7 Hz), 1.47 (s, 9H). extracted with 2×50 mL of ethyl acetate The organic layer was washed with 2×50 mL portions of aq. LiCl, sat. aq. NaHCO3, sat. aq. NaCl dried (MgSO4) After the solution was concentrated the residue was purified by column chromatography (eluted with 7% EtOAc-Heptane)

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

Procedure: N-Boc-L-Cysteine methyl ester (260 mg, 0.23 mL, 1.1 mmol) was added dropwise to a stirred suspension of 2-Benzyl-3-(4′-bromomethylbiphen-4-yl)benzofuran (500 mg, 1.1 mmol) and cesium carbonate (720 mg, 2.21 mmol) in anhydrous dimethylformamide (20 mL). The reaction was stirred at room temperature for 2 hrs (TLC control) and then poured into water (100 mL) and extracted with diethyl ether (3×100 mL). The combined extract was washed with water, brine (3×), dried over anhydrous MgSO4, filtered and concentrated in vacuo. Purification using 30% ethyl acetate in heptane as eluent afforded the title compound as a white solid (620 mg, 92%): 1H NMR (CDCl3, 300 MHz): δ 7.70 (2H, m, Ar—H), 7.64 (2H, m, Ar—H), 7.60 (3H, m, Ar—H), 7.48 (1H, m, Ar—H), 7.42 (2H, m, Ar—H), 7.26-7.36 (7H, m, Ar—H), 5.32 (1H, d, J=8 Hz, NH), 4.58 (1H, m, CHN), 4.26 (2H, PhCH2), 3.79 (2H, s, PhCH2S), 3.76 (3H, s, OMe), 2.95 (1H, dd, J=13, 5 Hz, CHHCHN), 2.84 (1H, dd, J=13, 7 Hz, CHHCHN), 1.46 (9H, s, CMe3); ESI-LCMS e/z calcd for C37H37NO5S 607.760, found 608 (M+H)+, 630 (M+Na)+. extracted with diethyl ether (3×100 mL) The combined extract was washed with water, brine (3×) dried over anhydrous MgSO4 filtered concentrated in vacuo Purification

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

Procedure: A solution of methyl N-(tert-butoxycarbonyl)-L-cysteinate (2.6 g, 11.0 mmol) in THF (10 ml) stirred at 0° C. under N2 was treated with slow addition of a 1M solution of LiAlH4 in THF (20 mL, 20 mmol). The reaction mixture was slowly warmed up to room temperature and further stirred for 2 h, cooled to 0° C. and quenched with slow addition of water, then poured on a 15% solution of K2CO3 in water (25 mL), shaken well and extracted with DCM (3×100 mL), the organic layers were combined and dried over MgSO4, filtered and concentrated to afford the title compound as colorless oil, kept under N2 atmosphere all the times and used fresh without further purification. Assumed quantitative yield. MS: m/z=230.1 (MNa+). cooled to 0° C. quenched with slow addition of water poured on a 15% solution of K2CO3 in water (25 mL) shaken well extracted with DCM (3×100 mL) dried over MgSO4 filtered concentrated

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

Procedure: The compound is synthesized from 2-[(3-bromophenyl)(1-methylpiperidin-4-yloxy)methyl]-1H-benzimidazole (example 72A) and N-Boc-Cysteine methyl ester using the method described in example 150; mixture of diastereomers. 1H NMR: 10.66 and 9.83 (sl, 1H), 7.90-7.70 (m, 2H), 7.50-7.35 (m, 2H), 7.35-7.18 (m, 5H), 5.87 and 5.85 (s, 1H), 5.58-5.30 (m, 1H), 4.65-4.40 (m, 1H), 3.70-3.20 (m, 6H), 2.82-2.62 (m, 2H), 2.28 and 2.26 (s, 3H), 2.22-1.65 (m, 6H), 1.53 and 1.45 (s, 9H). mixture of diastereomers

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: MSH 1 (439 mg, 2.0 mmol) was added to a 10 mL round bottom flask and dissolved in DMF (3 mL). In a separate vial, N-(tert-butoxycarbonyl)-L-cysteine methyl ester 2 (48 mg, 0.20 mmol) was added and dissolved in DMF (3 mL). The vial was cooled to 0° C. and a solution of potassium carbonate (138 mg, 1.0 mmol) in water (3.0 mL) was added. The resulting solution was added dropwise by pipette over a period of 3 min to the stirred MSH solution at room temperature. The vial was rinsed with DMF (2×1 mL) to ensure complete transfer. TLC (petrol:ethyl acetate, 4:1) analysis after completion of the addition revealed a single, UV active product (Rf 0.6). The reaction mixture was transferred to a separatory funnel and diluted with diethyl ether (150 mL) and water (100 mL). After separation, the organic layer was washed successively with water (80 mL) and brine (80 mL) before drying (MgSO4) and filtering. The solvent was removed under reduced pressure and the resulting residue purified by column chromatography to provide methyl 2-[(tert-butoxycarbonyl)amino]acrylate 3 as a clear oil (40 mg, 98%). The resulting solution was added dropwise by pipette over a period of 3 min to the stirred MSH solution at room temperature The vial was rinsed with DMF (2×1 mL) TLC (petrol:ethyl acetate, 4:1) analysis after completion of the addition The reaction mixture was transferred to a separatory funnel diluted with diethyl ether (150 mL) and water (100 mL) After separation the organic layer was washed successively with water (80 mL) and brine (80 mL) before drying (MgSO4) filtering The solvent was removed under reduced pressure the resulting residue purified by column chromatography

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: MSH 1 (439 mg, 2.0 mmol) was added to a 10 mL round bottom flask and dissolved in DMF (3 mL). In a separate vial, N-(tert-butoxycarbonyl)-L-cysteine methyl ester 2 (48 mg, 0.20 mmol) was added and dissolved in DMF (3 mL). The vial was cooled to 0° C. and a solution of potassium carbonate (138 mg, 1.0 mmol) in water (3.0 mL) was added. The resulting solution was added dropwise by pipette over a period of 3 min to the stirred MSH solution at room temperature. The vial was rinsed with DMF (2×1 mL) to ensure complete transfer. TLC (petrol:ethyl acetate, 4:1) analysis after completion of the addition revealed a single, UV active product (Rf 0.6). The reaction mixture was transferred to a separatory funnel and diluted with diethyl ether (150 mL) and water (100 mL). After separation, the organic layer was washed successively with water (80 mL) and brine (80 mL) before drying (MgSO4) and filtering. The solvent was removed under reduced pressure and the resulting residue purified by column chromatography to provide methyl 2-[(tert-butoxycarbonyl)amino]acrylate 3 as a clear oil (40 mg, 98%). The resulting solution was added dropwise by pipette over a period of 3 min to the stirred MSH solution at room temperature The vial was rinsed with DMF (2×1 mL) TLC (petrol:ethyl acetate, 4:1) analysis after completion of the addition The reaction mixture was transferred to a separatory funnel diluted with diethyl ether (150 mL) and water (100 mL) After separation the organic layer was washed successively with water (80 mL) and brine (80 mL) before drying (MgSO4) filtering The solvent was removed under reduced pressure the resulting residue purified by column chromatography

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

Procedure: Prepared in 60% (333 mg) yield as described in general procedure (D) using trans-3-(5-bromo-thiazol-2-yl)-1-cyclohexyl-1-(4-methyl-cyclohexyl)-urea (400 mg, 1.0 mmol) and N-(tert-butoxycarbonyl)-L-cysteine methyl ester (470 mg, 2.0 mmol). Prepared in 60% (333 mg) yield

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

Procedure: N-BOC-cysteine methyl ester (obtained from Sigma-Aldrich, Auckland, New Zealand) (5.00 g, 21.2 mmol) was dissolved in anhydrous DCM (30 mL) under an atmosphere of argon. Triethylamine (3.26 mL, 23.3 mmol) and allyl bromide (2.02 mL, 23.3 mmol) were added. The reaction mixture was stirred at rt for eighteen h before being concentrated in vacuo. The residue was partitioned between EtOAc and 1M hydrochloric acid. The organic phase was washed with brine, dried (MgSO4), filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica using a gradient of EtOAc and (50/70) petroleum ether to yield a white solid, 3.22 g, 55%. Rf=0.19 (1/5 (EtOAc/(50/70) petroleum ether). before being concentrated in vacuo The residue was partitioned between EtOAc and 1M hydrochloric acid The organic phase was washed with brine dried (MgSO4) filtered concentrated in vacuo The crude material was purified by flash chromatography on silica using a gradient of EtOAc and (50/70) petroleum ether to yield a white solid, 3.22 g, 55%