5-(2-piperazin-1-ylethyl)-3H-2-benzofuran-1-one

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

Procedure: To a solution of [3-fluoro-4-(1H-tetrazol-1-yl)phenyl]acetic acid (0.68 mmol) in 10 mL of anhydrous DCM was added 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one (191 mg, 0.68 mmol), EDC (200 mg, 1.01 mmol), HOBt (136 mg, 1.01 mmol), TEA (341 mg, 3.38 mmol) was stirred at ambient temperature overnight. The mixture was added DCM, washed with brine, the organic layer was dried over anhydrous Na2SO4 and concentrated. The residue was purified via prep-TLC to give the title compound. 1H-NMR (400 MHz, CDCl3) δ ppm 8.84 (s, 1H), 7.82 (d, J=7.8 Hz, 1H), 7.31˜737 (m, 3H), 7.11˜7.19 (m, 2H), 5.29 (s, 2H), 3.59 (s, 2H), 3.49˜3.52 (m, 2H), 3.37˜3.4 (m, 2H), 2.89˜2.93 (m, 2H), 2.64˜2.68 (m, 2H), 2.4˜2.45 (m, 4H). washed with brine the organic layer was dried over anhydrous Na2SO4 concentrated The residue was purified via prep-TLC

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

Procedure: A mixture of 5-[2-(piperazin-1-yl)ethyl]-2-benzofuran-1(3H)-one (50 mg, 0.20 mmol), 4-(2-Oxoethyl)benzonitrile (30 mg, 0.20 mmol), Sodium Cyanoborohydride (13 mg, 0.20 mmol), and a drop of HOAc was stirred together in Methanol for 2 hours. LC showed formation of the desired product. The crude was diluted with EtOAc, washed with water, adsorbed onto silica gel, and purified by silica gel chromatography. LC-MS (IE, m/z): 376 [M+1]+. (0.30 μM)

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

Procedure: A solution of crude 2-(cyclopropyloxy)-4-(2-oxoethyl)benzonitrile (80 mg, 0.4 mmol), 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one (150 mg, 0.6 mmol) and NaBH(OAc)3 (400 mg, 2 mmol) in 10 mL of anhydrous DCM was stirred at ambient temperature overnight. The reaction mixture was added 50 mL of DCM and washed with brine. The organic layer was dried over anhydrous sodium sulfate and concentrated. The residue was purified with prep-TLC to afford 2-(cyclopropyloxy)-4-(2-{4-[2-(1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)benzonitrile. 1H-NMR (400 MHz, CDCl3) δ ppm 7.77 (d, J=7.8 Hz, 1H), 7.37 (d, J=7.8 Hz, 1H), 7.31 (d, J=7.8 Hz, 1H), 7.27 (s, 1H), 7.11 (s, 1H), 6.78˜6.80 (m, 1H), 5.22 (s, 2H), 2.42˜2.93 (m, 17H), 0.77˜0.80 (m, 4H). (0.28 μM) washed with brine The organic layer was dried over anhydrous sodium sulfate concentrated The residue was purified with prep-TLC

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

Procedure: To a mixture of 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one (90 mg, 0.190 mmol) and NaBH3CN (24 mg, 0.380 mmol) in 20 mL DCM was added 5-chloro-2-methoxy-4-(2-oxoethyl)benzonitrile (40 mg, 0.190 mmol) and the mixture was stirred at RT overnight. Concentrated, and the residue was purified by prep-TLC to give 5-chloro-2-methoxy-4-(2-{4-[2-(1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)benzonitrile. 1H-NMR (400 MHz, MeOD) δ ppm 7.82 (d, J=7.8 Hz, 1H), 7.67 (s, 1H), 7.50˜7.53 (m, 2H), 7.20 (s, 1H), 5.35 (s, 2H), 3.95 (s, 3H), 3.23˜3.26 (m, 6H), 3.10˜3.16 (m, 8H), 3.00˜3.03 (m, 2H). MS m/e 441 (M+1)+. (0.094 μM) Concentrated the residue was purified by prep-TLC

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

Procedure: To a mixture of 5-[2-(piperazin-1-yl)ethyl]-2-benzofuran-1(3H)-one (95 mg, 0.27 mmol) and 5-fluoro-2-methoxy-4-(2-oxoethyl)benzonitrile (40 mg, 0.23 mmol) in methanol (1.0 mL) at 0° C. was added sodium cyanoborohydride (20 mg, 0.32 mmol) and the mixture was stirred at room temperature for 12 hours. The reaction mixture was concentrated and purified by mass-directed HPLC to provide 5-fluoro-2-methoxy-4-(2-{4-[2-(4-methyl-1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)benzonitrile. LC-MS (IE, m/z): 438.4 [M+1]+. (0.034 μM) The reaction mixture was concentrated purified by mass-directed HPLC

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

Procedure: To a mixture of 5-[2-(piperazin-1-yl)ethyl]-2-benzofuran-1(3H)-one (94 mg, 0.33 mmol) and 5-fluoro-2-methoxy-4-(2-oxoethyl)benzonitrile (58 mg, 0.30 mmol) in methanol (3.0 mL) at 0° C. was added sodium cyanoborohydride (29 mg, 0.47 mmol) and the mixture was stirred at room temperature for 12 hours. The reaction mixture was concentrated and purified by mass-directed HPLC to provide 5-fluoro-2-methoxy-4-(2-{4-[2-(1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)benzonitrile. LC-MS (IE, m/z): 424.3 [M+1]+. (0.068 μM) The reaction mixture was concentrated purified by mass-directed HPLC

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

Procedure: To a 12 mL reaction vial was added 4-formyl-3,4-dihydro-2H-chromene-7-carbonitrile (50 mg, 0.27 mmol), 5-[2-(piperazin-1-yl)ethyl]-2-benzofuran-1(3H)-one (66 mg, 0.27 mmol) and dichloromethane (3 mL). The solution was stirred at RT under N2 for 10 min. To above solution was added sodium tris(acetoxy) borohydride (224 mg, 1.1 mmol). The reaction was stirred at RT for 18 hours under N2, extracted with DCM, washed with brine and water. The organic phase was dried over MgSO4, filtered and purified by flash column chromatography. LC-MS (IE, m/z): 418.1 [M+1]+. 1H NMR (500 MHz, CDCl3, δ in ppm): 7.84 (1H, d, J=7.8 Hz), 7.38 (1H, d, J=7.8 Hz), 7.32 (2H, m), 7.11 (1H, dxd, J=8.0 Hz, J=1.6 Hz), 7.08 (1H, d, J=1.6 Hz), 5.60 (2H, s), 4.4 (2H, m), 3.0 (4H, m), 2.4-2.8 (10H, m), 2.0 (2H, m). (0.092 μM) To a 12 mL reaction The reaction was stirred at RT for 18 hours under N2 extracted with DCM washed with brine and water The organic phase was dried over MgSO4 filtered purified by flash column chromatography

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

Procedure: 5-fluoro-4-(1-hydroxy-2-{4-[2-(1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)-2-(methyloxy)benzonitrile was prepared in a similar fashion to that described for the synthesis of EXAMPLE 12 starting from 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one and 5-fluoro-2-(methyloxy)-4-oxiran-2-ylbenzonitrile.

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

Procedure: 4-(1-Hydroxy-2-{4-[2-(1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)-2-(methyloxy)benzonitrile was prepared in a similar fashion to that described for the synthesis of EXAMPLE 12 starting from 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one and 2-(methyloxy)-4-oxiran-2-ylbenzonitrile.

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

Procedure: 5-(1-Hydroxy-2-{4-[2-(1-oxo-1,3-dihydro-2-benzo furan-5-yl)ethyl]piperazin-1-yl}ethyl)-4-methyl-2-benzofuran-1(3H)-one was prepared in a similar fashion to that described for the synthesis of EXAMPLE 12 starting from 4-methyl-5-oxiran-2-yl-2-benzofuran-1(3H)-one and 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one.

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

Procedure: 5-fluoro-4-(1-hydroxy-2-{4-[2-(1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)-2-(methyloxy)benzonitrile was prepared in a similar fashion to that described for the synthesis of EXAMPLE 12 starting from 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one and 5-fluoro-2-(methyloxy)-4-oxiran-2-ylbenzonitrile.

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

Procedure: 4-(1-Hydroxy-2-{4-[2-(1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)-2-(methyloxy)benzonitrile was prepared in a similar fashion to that described for the synthesis of EXAMPLE 12 starting from 5-(2-piperazin-1-ylethyl)-2-benzofuran-1(3H)-one and 2-(methyloxy)-4-oxiran-2-ylbenzonitrile.