Formaldehyde → HCID 25160582, compound

HRID 914021Notes

Reaction equation

HRID 914021 reaction equation
[CH:1]1([CH2:4][N:5]2[C:13]3[C:8](=[CH:9][C:10]([CH3:38])=[CH:11][C:12]=3[CH:14]([O:16][CH2:17][C:18]3([C:31]4[CH:36]=[CH:35][C:34]([F:37])=[CH:33][CH:32]=4)[CH2:23][CH2:22][N:21]([C:24](OC(C)(C)C)=O)[CH2:20][CH2:19]3)[CH3:15])[CH:7]=[N:6]2)[CH2:3][CH2:2]1.C([BH3-])#N.[Na+].C=O>FC(F)(F)C(O)=O.C(O)(=O)C>[CH:1]1([CH2:4][N:5]2[C:13]3[C:8](=[CH:9][C:10]([CH3:38])=[CH:11][C:12]=3[CH:14]([O:16][CH2:17][C:18]3([C:31]4[CH:32]=[CH:33][C:34]([F:37])=[CH:35][CH:36]=4)[CH2:19][CH2:20][N:21]([CH3:24])[CH2:22][CH2:23]3)[CH3:15])[CH:7]=[N:6]2)[CH2:2][CH2:3]1

Participants

6

Reactant 3

HCID 712FormaldehydeHCID 5003444Sodium cyanoborohydrideHCID 57546242HCID 57546242, compound

Product 1

HCID 25160582HCID 25160582, compound

Reagents, catalysts & solvents 2

HCID 176Acetic AcidCatalystHCID 6422Trifluoroacetic acidSolvent

Procedure

(±)-tert-Butyl 4-((1-(1-(cyclopropylmethyl)-5-methyl-1H-indazol-7-yl)ethoxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate (7 mg, 0.01 mmol) was dissolved in trifluoroacetic acid (50% in dichloromethane, 1 mL) and stirred at room temperature for 1 h. The reaction was concentrated, loaded onto a strong cation exchange cartridge in methanol, and flushed with several volumes of methanol which were discarded. The crude secondary amine was eluted in 2 M ammonia in methanol and concentrated. The resulting residue was dissolved in acetonitrile (1 mL), cooled to 0° C., and treated with sodium cyanoborohydride (4.2 mg, 0.07 mmol) and formalin (37 μL). After 5 min, the reaction was treated with a few drops of acetic acid. The ice bath was removed and stirring continued for 1 h. The reaction was concentrated and purified by flash chromatography on silica gel (10% methanolic ammonia/methylene chloride) to afford 4 mg (68%). LC/MS (HPLC method 1): tR=2.49 min, 436.59(MH)+.

Workup

  1. concentrationThe reaction was concentrated
  2. customflushed with several volumes of methanol which
  3. washThe crude secondary amine was eluted in 2 M ammonia in methanol
  4. concentrationconcentrated
  5. dissolutionThe resulting residue was dissolved in acetonitrile (1 mL)
  6. temperaturecooled to 0° C.
  7. waitAfter 5 min
  8. customThe ice bath was removed
  9. stirringstirring
  10. waitcontinued for 1 h
  11. concentrationThe reaction was concentrated
  12. custompurified by flash chromatography on silica gel (10% methanolic ammonia/methylene chloride)
  13. customto afford 4 mg (68%)

Sources & evidence

ORD record
ord-b32d400a24004e72bc132008eba7d816
Source dataset
uspto-grants-2011_09
Patent number
US08026257B2

Reaction notes

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