Sodium Bicarbonate → HCID 178521182, compound

HRID 1638104Notes

Reaction equation

HRID 1638104 reaction equation
[F:1][C:2]1[CH:10]=[C:9]2[C:5]([C:6]([CH:11]3[CH2:16][CH2:15][NH:14][CH2:13][CH2:12]3)=[N:7][NH:8]2)=[CH:4][CH:3]=1.Br[CH2:18][C:19]([N:21]1[CH2:30][CH2:29][C:28]2[C:23](=[CH:24][CH:25]=[CH:26][CH:27]=2)[CH2:22]1)=[O:20].C(=O)(O)[O-].[Na+]>CC#N>[CH2:22]1[C:23]2[C:28](=[CH:27][CH:26]=[CH:25][CH:24]=2)[CH2:29][CH2:30][N:21]1[C:19](=[O:20])[CH2:18][N:14]1[CH2:15][CH2:16][CH:11]([C:6]2[C:5]3[C:9](=[CH:10][C:2]([F:1])=[CH:3][CH:4]=3)[NH:8][N:7]=2)[CH2:12][CH2:13]1

Participants

5

Reactant 3

HCID 516892Sodium BicarbonateHCID 184672392-Bromo-1-(1,2,3,4-tetrahydroisoquinolin-2-yl)ethan-1-oneHCID 178505426HCID 178505426, compound

Product 1

HCID 178521182HCID 178521182, compoundYield 55.3%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a solution of 4-(6-fluoro-1H-indazol-3-yl)piperidine (4.8 g, 18.9 mmol) in CH3CN (200 ml) was added 2-bromo-1-(1,2,3,4-tetrahydroisoquinolin-2-yl)ethanone (4.8 g, 18.9 mmol) and sodium bicarbonate (1.9 g, 22.7 mmol) at room temperature. The reaction mixture was warmed to reflux (4 hours), cooled to room temperature and filtered through a pad of celite. The solids were washed with DCM and the combined filtrates were concentrated. The remaining residue was purified via preparative HPLC (silica gel, 5-10% MeOH/DCM) to give 4.1 g of 1-(1,2,3,4-tetrahydroisoquinolin-2-yl)-2-[4-(6-fluoro-1H-indazol-3-yl)-1-piperidinyl]ethanone which was used without further purification. To a suspension of the latter (3.7 g, 9.4 mmol) in THF (100 ml) was added (dropwise) lithium aluminum hydride (11.3 ml of 1.0 M solution in THF, 11.3 mmol) at room temperature, under nitrogen. The reaction mixture was warned to reflux (5 hours), cooled to room temperature and carefully quenched with water (10 ml). The precipitated salts were removed via filtration and washed with 1:1 EtOAc/DCM. The combined filtrates were concentrated and the remaining oil was purified via flash column chromatography (silica gel, 10% MeOH/DCM) to give 2.2 g of the product. The dimaleate salt was prepared in methanol (30 ml) with maleic acid (3.0 eq.), m.p. 185-187° C.

Workup

  1. temperatureThe reaction mixture was warmed
  2. temperatureto reflux (4 hours)
  3. filtrationfiltered through a pad of celite
  4. washThe solids were washed with DCM
  5. concentrationthe combined filtrates were concentrated
  6. customThe remaining residue was purified via preparative HPLC (silica gel, 5-10% MeOH/DCM)

Sources & evidence

ORD record
ord-95a5d0c4e31b45628f4f2d1897d6c610
Source dataset
uspto-grants-2000_03
Patent number
US06043240

Reaction notes

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