3-propan-2-ylpiperazin-2-one

Conditions: temp:130.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: ((2R)-1,4-dibenzyl-2-piperazinyl)methyl methanesulfonate (0.450 g, 1.202 mmol) was combined with 3-isopropylpiperazin-2-one (0.179 g, 1.262 mmol, ChemBridge, San Diego, Calif.) and potassium carbonate (0.498 g, 3.60 mmol, Sigma-Aldrich, St. Louis, Mo.) in acetonitrile (5.46 mL) and heated at 130° C. After 1 h, the mixture was diluted with EtOAc and the solids were removed by filtering through a 0.2 μm millipore Millex-FG filter (Millipore, Billerica, Mass.). After concentration, the crude residue was purified by silica gel chromatography (2.5-8.5% MeOH in CH2Cl2) to give 4-(((2R)-1,4-dibenzyl-2-piperazinyl)methyl)-3-(1-methylethyl)-2-piperazinone (212 mg). the solids were removed by filtering through a 0.2 μm millipore Millex-FG filter (Millipore, Billerica, Mass.) After concentration the crude residue was purified by silica gel chromatography (2.5-8.5% MeOH in CH2Cl2)

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

Procedure: ((2R)-4-(2-thiophenylsulfonyl)-1-(4-(2,2,2-trifluoro-1-hydroxy-1-methylethyl)phenyl)-2-piperazinyl)methyl methanesulfonate (250 mg, 0.473 mmol, Intermediate B), 3-isopropylpiperazin-2-one (67.3 mg, 0.473 mmol, ChemBridge, San Diego, Calif.), and potassium carbonate (196 mg, 1.419 mmol, Sigma-Aldrich, St. Louis, Mo.) in acetonitrile (3.15 mL) was heated to 120° C. for 30 min After the reaction was allowed to cool to room temperature, the mixture was diluted with EtOAc and the solids were removed by filtering through a 0.2 μm millipore Millex-FG filter (Millipore, Billerica, Mass.). After concentration of the filtrate, the crude residue was purified by reverse-phase HPLC, (Phenomenex Gemini-NX 10μ, 110 Å, AXIA packed column, 100×50 mm, 60 mL/min, 10-95% CH3CN/H2O, 0.1% TFA, 10 min gradient), two peaks were collected and each was partitioned between CH2Cl2 and saturated aqueous NaHCO3, the organic layers were dried (Na2SO4), filtered and concentrated to give 4 isomeric products the solids were removed by filtering through a 0.2 μm millipore Millex-FG filter (Millipore, Billerica, Mass.) After concentration of the filtrate, the crude residue was purified by reverse-phase HPLC, (Phenomenex Gemini-NX 10μ, 110 Å, AXIA packed column, 100×50 mm, 60 mL/min, 10-95% CH3CN/H2O, 0.1% TFA, 10 min gradient), two peaks were collected each was partitioned between CH2Cl2 and saturated aqueous NaHCO3 the organic layers were dried (Na2SO4) filtered concentrated to give 4 isomeric products

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

Procedure: Ethyl 2-bromo-3-methylbutanoate (2.2 g, 10.52 mmol) in ethanol (15 mL) was added dropwise over a period of 2.5 hours to a stirred refluxing solution of ethane-1,2-diamine (13.2 mL, 197 mmol) in ethanol (60 mL). The mixture was heated for another 2.5 hours, and sodium ethoxide in ethanol (21% by wt) (4.0 mL, 10.80 mmol) was added and the mixture was heated for another 90 minutes. The reaction was then cooled and concentrated. After trituration with ether, the title compound was used in the next step without further purification. The mixture was heated for another 2.5 hours the mixture was heated for another 90 minutes The reaction was then cooled concentrated After trituration with ether, the title compound was used in the next step without further purification

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

Procedure: A mixture of 2-chloro-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde (212 mg, 0.75 mmol), 3-isopropylpiperazin-2-one (128 mg, 0.90 mmol) and powdered 4 Å molecular sieves in DCE (18 mL) were stirred at RT. After 4 h, sodium triacetoxyborohydride (318 mg, 1.50 mmol) was added and the resulting mixture stirred for a further 17 h. The reaction mixture was filtered through Celite®, loaded onto an Isolute® SCX-2 cartridge, washed with MeOH then the desired product eluted with 2 M NH3/MeOH in DCM. Trituration of the resulting residue with EtOAc gave 4-(2-Chloro-9-methyl-6-morpholin-4-yl-9H-purin-8-ylmethyl)-3-isopropylpiperazin-2-one as a yellow oil (198 mg, 65%). LCMS (Method H): RT=2.82 min, [M+H]+ 408.4 the resulting mixture stirred for a further 17 h The reaction mixture was filtered through Celite® washed with MeOH the desired product eluted with 2 M NH3/MeOH in DCM

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

Procedure: A mixture of 2-chloro-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde (212 mg, 0.75 mmol), 3-isopropylpiperazin-2-one (128 mg, 0.90 mmol) and powdered 4 Å molecular sieves in DCE (18 mL) were stirred at RT. After 4 h, sodium triacetoxyborohydride (318 mg, 1.50 mmol) was added and the resulting mixture stirred for a further 17 h. The reaction mixture was filtered through Celite®, loaded onto an Isolute® SCX-2 cartridge, washed with MeOH then the desired product eluted with 2 M NH3/MeOH in DCM. Trituration of the resulting residue with EtOAc gave 4-(2-Chloro-9-methyl-6-morpholin-4-yl-9H-purin-8-ylmethyl)-3-isopropylpiperazin-2-one as a yellow oil (198 mg, 65%). LCMS (Method H): RT=2.82 min, [M+H]+ 408.4 the resulting mixture stirred for a further 17 h The reaction mixture was filtered through Celite® washed with MeOH the desired product eluted with 2 M NH3/MeOH in DCM