(S)-(-)-N,alpha-Dimethylbenzylamine → (S)-methyl 3-methyl-6-(methyl (1-phenylethyl)amino)-[1,2,4]triazolo[4,3-b]pyridazine-8-carboxylate

HRID 521567

Reaction equation

Cl[C:2]1[CH:3]=[C:4]([C:12]([O:14][CH3:15])=[O:13])[C:5]2[N:6]([C:8]([CH3:11])=[N:9][N:10]=2)[N:7]=1.[CH3:16][NH:17][C@H:18]([C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)[CH3:19]>CS(C)=O.CC(=O)OCC>[CH3:11][C:8]1[N:6]2[N:7]=[C:2]([N:17]([CH3:16])[C@H:18]([C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[CH3:19])[CH:3]=[C:4]([C:12]([O:14][CH3:15])=[O:13])[C:5]2=[N:10][N:9]=1

Participants

Conditions

Temperature: 130 °C

Procedure

A mixture of compound methyl 6-chloro-3-methyl-[1,2,4]triazolo[4,3-b]pyridazine-8-carboxylate (2.0 g, 8.85 mmol) and (S)-N-methyl-1-phenylethanamine (2.39 g, 17.7 mmol) in anhydrous DMSO (20 mL) was stirred for 30 min at 130° C. under microwave condition. After cooled to room temperature, the mixture was diluted with EA (100 mL) and washed with H2O (100 mL*3). The organic layer was dried over Na2SO4, concentrated in vacuum and purified by flash column chromatography (silica-gel, DCM: MeOH=10:1) to give product (S)-methyl 3-methyl-6-(methyl (1-phenylethyl)amino)-[1,2,4]triazolo[4,3-b]pyridazine-8-carboxylate as a yellow oil (400 mg, 14.5%). LRMS (M+H+) m/z: calcd 326; found 326.

Workup

temperatureAfter cooled to room temperature
washwashed with H2O (100 mL*3)
dry with materialThe organic layer was dried over Na2SO4
concentrationconcentrated in vacuum
custompurified by flash column chromatography (silica-gel, DCM: MeOH=10:1)

Sources & evidence

ORD record: ord-a7b5c4f4c95f444e86c1cf4bcb686957
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09328117B2

Linked notes

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