Sodium borohydride → (1-Boc-6-fluoro-5-indazolyl)methanol

HRID 1098660Notes

Reaction equation

HRID 1098660 reaction equation
[F:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[N:7][N:8]2[C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])=[CH:4][C:3]=1[CH:18]=[O:19].[BH4-].[Na+]>CO.O.CCOC(C)=O>[OH:19][CH2:18][C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][C:2]=1[F:1])[N:8]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[N:7]=[CH:6]2

Participants

6

Reactant 2

HCID 4311764Sodium borohydrideHCID 59490926HCID 59490926, compound

Product 1

HCID 59490881(1-Boc-6-fluoro-5-indazolyl)methanolYield 84.1%

Reagents, catalysts & solvents 3

HCID 887MethanolSolventHCID 962WaterSolventHCID 8857Ethyl AcetateSolvent

Procedure

A solution of tert-butyl 6-fluoro-5-formyl-1H-indazole-1-carboxylate (29E, 3.55 g, 13.4 mmol) in methanol (50.00 mL) was treated with NaBH4 (1.02 g, 26.9 mmol) at 0° C. and allowed to stir for 1 h. The reaction mixture was diluted with water and EtOAc (500 mL). The organic layer was separated and washed with aq. HCl (1M, 200 mL), aq. NaOH (1M, 200 mL) brine (200 mL) dried (MgSO4), filtered, concentrated in vacuo and residue was purified using chromatography (SiO2, EtOAc/hexanes) to provide tert-butyl 5-(hydroxymethyl)-6-fluoro-1H-indazole-1-carboxylate (29F, 3.00 g; Yield=83.9%) as a colorless solid.

Workup

  1. customThe organic layer was separated
  2. washwashed with aq. HCl (1M, 200 mL), aq. NaOH (1M, 200 mL) brine (200 mL)
  3. dry with materialdried (MgSO4)
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo and residue
  6. customwas purified

Sources & evidence

ORD record
ord-2abe2bf6acc147c3b09af3833993ea40
Source dataset
uspto-grants-2012_03
Patent number
US08143305B2

Reaction notes

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