tert-Butyl piperazine-1-carboxylate → tert-butyl 4-(5-(4-(thiazol-2-ylcarbamoyl)-1H-benzo[d]imidazol-2-yl)pyridin-2-yl)piperazine-1-carboxylate

HRID 85099Notes

Reaction equation

Cl[C:2]1[N:7]=[CH:6][C:5]([C:8]2[NH:12][C:11]3[CH:13]=[CH:14][CH:15]=[C:16]([C:17]([NH:19][C:20]4[S:21][CH:22]=[CH:23][N:24]=4)=[O:18])[C:10]=3[N:9]=2)=[CH:4][CH:3]=1.[N:25]1([C:31]([O:33][C:34]([CH3:37])([CH3:36])[CH3:35])=[O:32])[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1>CS(C)=O.O>[S:21]1[CH:22]=[CH:23][N:24]=[C:20]1[NH:19][C:17]([C:16]1[C:10]2[N:9]=[C:8]([C:5]3[CH:4]=[CH:3][C:2]([N:28]4[CH2:27][CH2:26][N:25]([C:31]([O:33][C:34]([CH3:37])([CH3:36])[CH3:35])=[O:32])[CH2:30][CH2:29]4)=[N:7][CH:6]=3)[NH:12][C:11]=2[CH:13]=[CH:14][CH:15]=1)=[O:18]

Participants

Conditions

Temperature: 140 °C

Procedure

A mixture containing 2-(6-chloropyridin-3-yl)-N-(thiazol-2-yl)-1H-benzo[d]imidazole-4-carboxamide (7; 30 mg, 0.084 mmol) and tert-butyl piperazine-1-carboxylate (170; 156.5 mg, 0.84 mmol) in DMSO (1.2 mL) was stirred at 140° C. in a microwave reactor for 25 min. The reaction mixture was cooled to room temperature and diluted with water. The resulting solids were collected by filtration, washed with water and dried under vacuum to afford tert-butyl 4-(5-(4-(thiazol-2-ylcarbamoyl)-1H-benzo[d]imidazol-2-yl)pyridin-2-yl)piperazine-1-carboxylate 8 as a pale yellow solid (20 mg, 71%). MS (ESI) calcd for C25H27N7O3S: 505.19; found: 506 [M+H].

Workup

temperatureThe reaction mixture was cooled to room temperature
filtrationThe resulting solids were collected by filtration
washwashed with water
customdried under vacuum

Sources & evidence

ORD record: ord-b61fc10161cf4f17b7810df374e464d3
Source dataset: uspto-grants-2014_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08846947B2

Reaction notes

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