Tacedinaline

CI-994 (Tacedinaline) is an inhibitor of the histone deacetylase (HDAC) with IC50s of 0.9, 0.9, 1.2 μM for recombinant HDAC 1, 2 and 3 respectively.

Tacedinaline is a benzamide obtained by formal condensation of the carboxy group of 4-acetamidobenzoic acid with one of the amino groups of 1,2-phenylenediamine. An oral cytostatic drug with impressive differential activity against leukemic cells and normal stem-cells. Also used in combination therapy for selected tumors including non-smoll cell lung, pancreatic, breast, and colorectal cancers. It has a role as an EC 3.5.1.98 (histone deacetylase) inhibitor and an antineoplastic agent. It is a member of acetamides, a member of benzamides and a substituted aniline. It derives from a 1,2-phenylenediamine.|Tacedinaline has been used in trials studying the treatment of Lung Cancer, Multiple Myeloma, and Pancreatic Cancer.|Tacedinaline is an orally bioavailable substituted benzamide derivative with potential antineoplastic activity. Tacedinaline inhibits histone deacetylation, which may result in histone hyperacetylation, followed by the induction of differentiation, the inhibition of cell proliferation, and apoptosis in susceptible tumor cell populations.

To a 0 °C solution of tert-butyl (2-(4-acetamidobenzamido)phenyl) carbamate 1.5 (3.5 g, 9.5 mmol) in dry dichloromethane (55 mL) was added trifluoroacetic acid (22 mL) dropwise. The mixture was allowed to slowly warm to 23 °C for 2 hours until the reaction was complete. The solvents were removed in vacuo. The reaction mixture was diluted with water and the pH was adjusted to ~8 with a saturated aqueous solution of sodium bicarbonate. The resulting precipitate was filtered, washed with water and ether, and dried under vacuum to afford 4-acetamido-N-(2-aminophenyl)benzamide 1.6 as an off-white solid. Yield 1.6 = 2.4 g (96percent).1H NMR (500 Hz, dTo a 0° C. solution of tert-butyl (2-(4-acetamidobenzamido)phenyl) carbamate 1.5 (3.5 g, 9.5 mmol) in dry dichloromethane (55 mL) was added trifluoroacetic acid (22 mL) dropwise. The mixture was allowed to slowly warm to 23° C. for 2 hours until the reaction was complete. The solvents were removed in vacuo. The reaction mixture was diluted with water and the pH was adjusted to 8 with a saturated aqueous solution of sodium bicarbonate. The resulting precipitate was filtered, washed with water and ether, and dried under vacuum to afford 4-acetamido-N-(2-aminophenyl)benzamide 1.6 as an off-white solid. Yield 1.6=2.4 g (96percent). To a 0 °C solution of Boc protected benzamide 5 (18 g, 48.7mmol) in dry DCM (250 mL) was added TFA (100 mL) portion wise. The mixture was allowed to slowly warm to 23 °C. After stirring for 2 h, TLC showed that the reaction was complete. The TFA was removed in vacuo and the reaction mixture was diluted with water and the pH was adjusted to ~8 with sat. NaHCC>3. The resulting precipitate was filtered, washed with water, ether and dried under vacuum to afford 4-acetamido-N-(2- aminophenyl)benzamide 6 as an off-white solid.Yield: (11.5 g, 84percent). TLC : good, Rf = 0.3 (10percent MeOH in DCM) To the extent possible, the procedure set forth in Thomas, M. et al., Bioorganic & Medicinal Chemistry 2008, 16, 8109-8116, was followed as described herein. To a stirred solution of 4-acetamido benzoic acid 7.4 (2.5 g, 13.95 mmol, 1.0 eq.) in N, N-dimethylformamide (50 mL) was added o-phenyldiamine 7.7 (4.53 g, 41.9 mmol, 3.0 eq.), followed by N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (3.48 g, 18.14 mmol, 1.3 eq.) and catalytic 4-(dimethylamino)pyridine (0.18 g, 1.47 mmol, 0.1 eq.). The reaction mixture was stirred at room temperature for 16 hours. The solvents were removed under reduced pressure at 58° C. The crude residue was diluted with dichloromethane (100 mL) and kept in the refrigerator overnight. The resulting precipitate was filtered, washed with hot dichloromethane (100 mL), and dried under vacuum to afford 4-acetamido-N-(2-aminophenyl)benzamide 7.6 as an off-white solid. Yield 7.6=2.48 g (66percent).The dried solid of 4-acetamido-N-(2-aminophenyl)benzamide trifluoroacetate salt was suspended in a solution of 1 : 1 EtOH:H20 (320mL). Saturated NaHC0

Tacedinaline is a histone deacetylase (HDAC) inhibitor. Tacedinaline is an anti-cancer agent as HDAC inhibitors block angiogenesis, arrest cell growth, and lead to differentiation and apoptosis in tumor cells. Studies show Tacedinaline to be effective against acute myeloid leukemia in vitro and in vivo when used in combination with conventional anti-cancer agents.

Molecular Weight:269.30
XLogP3:1.3
Hydrogen Bond Donor Count:3
Hydrogen Bond Acceptor Count:3
Rotatable Bond Count:3
Exact Mass:269.116426730
Monoisotopic Mass:269.116426730
Topological Polar Surface Area:84.2
Heavy Atom Count:20
Complexity:351
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes