Veliparib

Veliparib is a potent PARP inhibitor, inhibiting PARP1 and PARP2 with Kis of 5.2 and 2.9 nM, respectively.

(2-methylpyrrolidin-2-yl) -1H-benzimidazole-4-carboxamide (0.0246 mol) was detected and found to contain 70percent 2 - ((R) -2-methylpyrrole Alkyl-2-yl) -lH-benzimidazole-4-carboxamide, Add anhydrous methanol 80ml, Stirring and heating to dissolve, Cooling to about 40 , A solution of 13.5 g (0.0, 345 mol) of (-)-di-p-toluoyl-L-tartaric acid(anhydrous) was added to 100 ml of anhydrous methanol, Soon precipitation of white products, Stirring for about 2 hours, filter, The filter cake was washed with anhydrous methanol, Filter cake without drying, Added to 80 ml of water, Stir, With alkali neutralization, Began to clear, And then precipitating the solid product, After stirring for 4 hours, Filter, Filter cake washed three times, Vacuum drying, (R) -2- (2-methylpyrrolidin-2-yl) -1H-benzimidazole-4-carboxamide, 3.6 g of HPLC, 99.7percent by HPLC and 99.8percent of chiral purity.Yield 85.7percent.(2-methylpyrrolidin-2-yl) -1H-benzimidazole-4-carboxamide (0.0246 mol) was detected and found to contain 70% 2 - ((R) -2-methylpyrrole Alkyl-2-yl) -lH-benzimidazole-4-carboxamide, Add anhydrous methanol 80ml, Stirring and heating to dissolve, Cooling to about 40 , A solution of 13.5 g (0.0, 345 mol) of (-)-di-p-toluoyl-L-tartaric acid(anhydrous) was added to 100 ml of anhydrous methanol, Soon precipitation of white products, Stirring for about 2 hours, filter, The filter cake was washed with anhydrous methanol, Filter cake without drying, Added to 80 ml of water, Stir, With alkali neutralization, Began to clear, And then precipitating the solid product, After stirring for 4 hours, Filter, Filter cake washed three times, Vacuum drying, (R) -2- (2-methylpyrrolidin-2-yl) -1H-benzimidazole-4-carboxamide, 3.6 g of HPLC, 99.7% by HPLC and 99.8% of chiral purity.Yield 85.7%.6.0 g (R) - tert-butyl-2- (2-amino-3-formyl-phenyl-carbamoyl) -2-methyl-pyrrolidine-1-carboxylate (0.016mol), Add 80% acetic acid 60ml, Heated to reflux for about 6 hours, Detecting the completion of the reaction material, The solvent was evaporated under vacuum, Add water 30ml dissolved, While stirring with alkaline solution (ammonia or 4N sodium hydroxide) to pH greater than 8, precipitation of white products, Stirring for about 2 hours, filter, Filter cake washed with water, Ethyl acetate, Vacuum drying, Product 25ml anhydrous methanol refining, (R) -2- (2-methylpyrrolidin-2-yl) -1H-benzimidazole-4-carboxamide, 3.1g of HPLC 99.7%, chiral purity 99.8%. Yield 77.5%.A mixture of ABT-888 dihydrochloride (10 g) was stirred in saturated potassium bicarbonate (50 mL) and n-butanol (50 mL) until the ABT-888 dihydrochloride completely dissolved. The aqueous layer was extracted with a second portion of n-butanol then discarded. The extracts were combined, washed with 15% sodium chloride solution (50 mL) and concentrated. The concentrate was chase distilled three times with heptane (50 mL), dissolved in refluxing 2-propanol (45 mL) and filtered hot. The filtrate was cooled to ambient temperature with stirring over 18 hours, cooled to 0-5 C., stirred for 1 hour, and filtered. The filtrant was washed with 2-propanol and dried in a vacuum oven at 45-50 C. with a slight nitrogen purgeStep 1: 2-(2-methyl-2-pyrrolidino)-benzimidazole-4-carboxamide 2 HCl (15) is dissolved in water (3.5 kg/kg 15) at 20+/-5 C. Dissolution of 15 in water results in a solution of pH 0-1.Step 2: The reaction is run at 20-25 C. One equivalent of sodium hydroxide is added, raising the pH to 2-3 with only a mild exotherm (10 C. observed with rapid addition of 1.0 equiv.). This generates a solution that remains clear for several days even when seeded with free base crystals. 3N NaOH (1.0 equiv., 1.25 kg/kg 15) is charged and the solution polish filtered into the crystallizer/reactor.Step 3: 5% Na2CO3 (1.5 equiv., 10.08 kg/kg 15) is then filtered into the crystallizer over 2 hours. Nucleation occurs after approximately th of the Na2CO3 solution is added (-0.25 equiv.)Step 4: The slurry is mixed for NLT 15 min before sampling (typically 1 to 4 hours (2.5 mg/mL product in the supernatant)). The slurry is filtered at 20 C. and washed with 6 portions of water (1.0 kg/kg 15 each). Each wash was applied to the top of the cake and then pressured through. No mixing of the wetcake was done.Step 5: The solids are then dried. Drying was performed at 50 C. keeping the Cogeim under vacuum while applying a slight nitrogen bleed. The agitator blade was left in the cake to improve heat transfer to the cake. It was rotated and lifted out of the cake once per hour of drying to speed the drying process while minimizing potential crystal attrition that occurs with continuous agitator use.A mixture of ABT-888 dihydrochloride (10 g) was stirred in saturated potassium bicarbonate (50 mL) and n-butanol (50 mL) until the ABT-888 dihydrochloride completely dissolved. The aqueous layer was extracted with a second portion of n-butanol then discarded. The extracts were combined, washed with 15% sodium chloride solution (50 mL) and concentrated. The concentrate was chase distilled three times with heptane (50 mL), dissolved in refluxing 2-propanol (45 mL) and filtered hot. The filtrate was cooled to ambient temperature with stirring over 18 hours, cooled to 0-5 C., stirred for 1 hour, and filtered. The filtrant was washed with 2-propanol and dried in a vacuum oven at 45-50 C. with a slight nitrogen purgeEXAMPLE 3B;

ABT-888 is a potent, orally bioavailable PARP-1/-2 inhibitor shown to potentiate DNA damaging agents. The ability to potentiate temozolomide (TMZ) and develop a biological marker for PARP inhibition was evaluated in vivo.