tert-butyl N-(4-bromobutyl)carbamate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: A solution of (4-bromobutyl)carbamic acid tert-butyl ester (3.75 g, 90%, 13.38 mmol) in acetone (10 mL) was added to a mixture of piperazine-1-carboxylic acid benzyl ester 15 (2.68 g, 12.16 mmol), sodium iodide (1.82 g, 12.16 mmol), and potassium carbonate (5.04 g, 36.47 mmol) in acetone (100 mL). The reaction mixture was stirred at reflux for 24 h. The mixture was concentrated in vacuo, the resulting residue was diluted with dichloromethane and insoluble inorganics were filtered off. The filtrate was concentrated in vacuo and the resulting residue was purified by Biotage silica gel column chromatography using methanol/dichloromethane (gradient 0% to 5%) to give 4-(4-tert-butoxycarbonylaminobutyl)piperazine-1-carboxylic acid benzyl ester (16) as a viscous, brown oil (3.26 g, 68%): 1H NMR (300 MHz, CDCl3) δ 1.40 (s, 9H), 1.51 (m, 4H), 2.49 (m, 6H), 3.10 (m, 2H), 3.51 (m, 4H), 5.10 (s, 2H), 5.25 (br, 1H), 7.32 (m, 5H); ESI MS m/z 392 [C21H33N3O4+H]+. at reflux for 24 h The mixture was concentrated in vacuo the resulting residue was diluted with dichloromethane and insoluble inorganics were filtered off The filtrate was concentrated in vacuo the resulting residue was purified by Biotage silica gel column chromatography

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

Procedure: To a mixture comprising 3,5-diamino-6-chloro-pyrazine-2-carboxylic acid (2-methylamino-ethyl)-amide (Intermediate E) (0.5 g, 2.0 mmol) and 4-(Boc-amino)butyl bromide (0.8 g, 3.1 mmol) in DMF (5 mL) is added sodium carbonate (0.4 g, 4.0 mmol). The resulting mixture is heated at reflux for 3 h and then allowed to cool to RT, filtered and concentrated in vacuo. The crude product is dissolved in DCM and filtered to remove any undissolved impurities. The filtrate is concentrated in vacuo to yield the title compound which is used in the next step without further purification. The resulting mixture is heated at reflux for 3 h filtered concentrated in vacuo The crude product is dissolved in DCM filtered to remove any undissolved impurities The filtrate is concentrated in vacuo

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

Procedure: To a mixture comprising 3,5-diamino-6-chloro-pyrazine-2-carboxylic acid (2-methylamino-ethyl)-amide (Intermediate E) (0.5 g, 2.0 mmol) and 4-(Boc-amino)butyl bromide (0.8 g, 3.1 mmol) in DMF (5 mL) is added sodium carbonate (0.4 g, 4.0 mmol). The resulting mixture is heated at reflux for 3 h and then allowed to cool to RT, filtered and concentrated in vacuo. The crude product is dissolved in DCM and filtered to remove any undissolved impurities. The filtrate is concentrated in vacuo to yield the title compound which is used in the next step without further purification. The resulting mixture is heated at reflux for 3 h filtered concentrated in vacuo The crude product is dissolved in DCM filtered to remove any undissolved impurities The filtrate is concentrated in vacuo

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

Procedure: To a solution of 9-chloro-3,3a,4,4a-tetrahydro-2H-furo[2′,3′:2,3]cyclobuta[1,2-c]quinolin-5(6H)-one (200 mg, 0.801 mmol) in dimethylformamide (4 ml) at 0° C. was slowly added sodium hydride (19 mg, 0.801 mmol) over 15 minutes. The suspension was allowed to warm to room temperature. The mixture stirred for 45 minutes and 4-(Boc-amino)butyl bromide (202 mg, 0.801 mmol) was added. The solution was stirred for 15 hours, followed by addition of 0.25 mL methanol. Column chromatography provided the title compound. at 0° C. over 15 minutes The solution was stirred for 15 hours