Sodium Bicarbonate → 3-methyl-7-((6-phenyl-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methyl)quinoxalin-2(1H)-one

HRID 40389Notes

Reaction equation

[CH3:1][C:2]1[C:11](=[O:12])[NH:10][C:9]2[C:4](=[CH:5][CH:6]=[C:7]([CH2:13][C:14](OC(C)(C)C)=O)[CH:8]=2)[N:3]=1.CC1C(=O)NC2C(N=1)=CC(CC(OC(C)(C)C)=O)=CC=2.[C:41]1([C:47]2[N:52]=[N:51][C:50]([NH:53][NH2:54])=[CH:49][CH:48]=2)[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=1.O.C1(C)C=CC(S(O)(=O)=O)=CC=1.C([O-])(O)=O.[Na+]>O1CCOCC1.CCOC(C)=O>[CH3:1][C:2]1[C:11](=[O:12])[NH:10][C:9]2[C:4]([N:3]=1)=[CH:5][CH:6]=[C:7]([CH2:13][C:14]1[N:51]3[N:52]=[C:47]([C:41]4[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=4)[CH:48]=[CH:49][C:50]3=[N:53][N:54]=1)[CH:8]=2

Participants

Conditions

Temperature: 150 °C

Procedure

A mixture of tert-butyl 2-(2-methyl-3-oxo-3,4-dihydroquinoxalin-6-yl)acetate (0.10 g, 0.36 mmol), tert-butyl 2-(3-methyl-2-oxo-1,2-dihydroquinoxalin-6-yl)acetate (0.10 g, 0.36 mmol), 1-(6-phenylpyridazin-3-yl)hydrazine (0.081 g, 0.44 mmol) and p-toluenesulfonic acid monohydrate (0.069 g, 0.36 mmol) in 3 mL of dioxane was heated with microwave at 150° C. for 1 hour. The mixture was diluted with 70 mL of EtOAc and 40 mL of satd. NaHCO3 solution. The organic phase was separated and was washed with 40 mL of brine, dried over Na2SO4 and concentrated in vacuo. The residue was purified by prep-HPLC to resolve the regiostereomers as example compounds 494 and 495. For each regiosteroemer MS (ESI pos. ion) m/z: 369 (MH+). Calc'd exact mass for C21H16N6O: 368.

Workup

customThe organic phase was separated
washwas washed with 40 mL of brine
dry with materialdried over Na2SO4
concentrationconcentrated in vacuo
customThe residue was purified by prep-HPLC

Sources & evidence

ORD record: ord-9dd956c324774b6395452e42afc276c7
Source dataset: uspto-grants-2013_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08524900B2

Reaction notes

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