Diisopropylethylamine → 5-Chloro-4-[4-(5-methyl-isoxazol-3-ylmethyl)-piperazin-1-yl]-3-nitro-pyridin-2-ylamine

Temperature

45 °C

A solution of 4-(5-methyl-isoxazol-3-ylmethyl)-piperazine-1-carboxylic acid tert-butyl ester (0.126 g, 0.45 mmol) in dichloromethane (3.7 ml) and TFA (5 ml) was stirred at room temperature for 1.5 h then concentrated in vacuo, and the resulting residue was dried in vacuo. Part of this material (estimated 0.15 mmol) was dissolved in isopropanol (3 ml) and to this solution 2-amino-4,5-dichloro-3-nitropyridine (0.031 g, 0.15 mmol) was added followed by diisopropylethylamine (0.15 ml, 0.80 mmol). The reaction mixture was stirred at 45° C. for 20 h, then allowed to cool to room temperature and diluted with isopropanol (3 ml). The resulting yellow precipitate was collected by filtration, washed with isopropanol (2×3 ml), diethyl ether (2×3 ml), and dried (0.038 g, 73%); 1H-NMR (500 MHz, DMSO-d6) 2.38 (s, 3H, isoxazole 5-CH3), 2.52 (br s 4H, piperazine N(CH2)2), 3.06 (br t, J=4.1 Hz, 4H, piperazine N(CH2)2), 3.56 (s, 2H, NCH2 isoxale), 6.21 (s, 1H, isoxazole 4-H), 6.96 (s, 2H, NH2), 8.06 (s, 1H, pyridine 6-H);

1. concentrationthen concentrated in vacuo
2. customthe resulting residue was dried in vacuo
3. additionwas added
4. temperatureto cool to room temperature
5. filtrationThe resulting yellow precipitate was collected by filtration
6. washwashed with isopropanol (2×3 ml), diethyl ether (2×3 ml)
7. customdried (0.038 g, 73%)

ORD record

ord-18283aca5b754ad8beb306ac47341f71

Source dataset

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08088761B2