3-(Boc-amino)piperidine → HCID 178481773, compound
Reaction equation
Cl[C:2]1[N:12](C(C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[C:5]2[CH:6]=[N:7][N:8]([CH3:11])[C:9](=[O:10])[C:4]=2[N:3]=1.[NH:32]1[CH2:37][CH2:36][CH2:35][CH:34]([NH:38][C:39](=[O:45])[O:40][C:41]([CH3:44])([CH3:43])[CH3:42])[CH2:33]1>>[CH3:11][N:8]1[C:9](=[O:10])[C:4]2[NH:3][C:2]([N:32]3[CH2:37][CH2:36][CH2:35][CH:34]([NH:38][C:39](=[O:45])[O:40][C:41]([CH3:43])([CH3:42])[CH3:44])[CH2:33]3)=[N:12][C:5]=2[CH:6]=[N:7]1Participants
Conditions
- Temperature
- 150 °C
Procedure
0.020 g of 2-chloro-5-methyl-1-trityl-1,5-dihydroimidazo[4,5-d]pyridazine-4-one and 0.040 g of t-butyl piperidin-3-ylcarbamate were combined together, and the mixture was heated under a nitrogen atmosphere at 150° C. for 1 hour. The reaction mixture was purified by silica gel column chromatography. Thus, 0.016 g of t-butyl [1-(6-methyl-7-oxo-6,7-dihydro-1H-imidazo[4,5-d]pyridazin-2-yl)piperidin-3-yl]carbamate was obtained from the fraction eluted with ethyl acetate. 0.0080 g of this compound was dissolved in 0.6 ml of N,N-dimethylformamide, and then 0.0038 g of potassium carbonate and 0.003 ml of 2-butynyl bromide were added thereto. The mixture was stirred at room temperature for 18 hours. The reaction mixture was partitioned between 1 ml of ethyl acetate and 1 ml of water, and the organic layer was concentrated. The residue was dissolved in 0.5 ml of dichloromethane, and then 0.5 ml of trifluoroacetic acid was added thereto. After 1 hour, the reaction solution was concentrated. The residue was purified by reverse-phase high performance liquid chromatography (using an acetonitrile-water mobile phase (containing 0.1% trifluoroacetic acid)) to give 0.0046 g of the title compound.
Workup
- customThe reaction mixture was purified by silica gel column chromatography
Sources & evidence
- ORD record
- ord-fae44867b57b4e62b9df66a0654355fc
- Source dataset
- uspto-grants-2010_08
- Patent number
- US07772226B2
Reaction notes
Loading…