4-Fluorobenzaldehyde → methyl (1S,2R,3S,4R)-3-[(4-fluorobenzyl)amino]bicyclo[2.2.1]heptane-2-carboxylate

HRID 548304Notes

Reaction equation

HRID 548304 reaction equation
Cl.[NH2:2][C@H:3]1[C@H:8]2[CH2:9][C@H:5]([CH2:6][CH2:7]2)[C@H:4]1[C:10]([O:12][CH3:13])=[O:11].C([O-])(=O)C.[Na+].[F:19][C:20]1[CH:27]=[CH:26][C:23]([CH:24]=O)=[CH:22][CH:21]=1.C([BH3-])#N.[Na+].C(=O)(O)[O-].[Na+]>CO.C(OCC)(=O)C>[F:19][C:20]1[CH:27]=[CH:26][C:23]([CH2:24][NH:2][C@H:3]2[C@H:8]3[CH2:9][C@H:5]([CH2:6][CH2:7]3)[C@H:4]2[C:10]([O:12][CH3:13])=[O:11])=[CH:22][CH:21]=1

Participants

8

Reactant 5

HCID 680234-FluorobenzaldehydeHCID 516892Sodium BicarbonateHCID 517045Sodium AcetateHCID 5003444Sodium cyanoborohydrideHCID 66674231Methyl (1S,2R,3S,4R)-3-aminobicyclo[2.2.1]heptane-2-carboxylate Hydrochloride

Product 1

HCID 66674783methyl (1S,2R,3S,4R)-3-[(4-fluorobenzyl)amino]bicyclo[2.2.1]heptane-2-carboxylateYield 98.4%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
25 °C

Procedure

Methyl (1S,2R,3S,4R)-3-aminobicyclo[2.2.1]heptane-2-carboxylate hydrochloride (prepared as described in Example 6c, 0.5 g, 2.43 mmol) was dissolved in methanol (12 mL). Sodium acetate (0.4 g, 4.86 mmol) was added followed by 4 Å powdered molecular sieves (0.5 g) and 4-fluoro-benzaldehyde (0.302 g, 2.43 mmol). Sodium cyanoborohydride (0.305 g, 4.86 mmol) was added and the mixture was stirred at 25° C. for 16 h. The mixture was poured into a mixture of saturated aqueous sodium bicarbonate solution (200 mL) and ethyl acetate (300 mL). After shaking, both layers were passed through a plug of Celite. The organic layer was further washed with saturated aqueous sodium bicarbonate solution (100 mL), saturated aqueous brine solution (100 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo to afford the crude product, methyl (1S,2R,3S,4R)-3-[(4-fluorobenzyl)amino]bicyclo[2.2.1]heptane-2-carboxylate (0.663 g, 2.39 mmol, 98%), as a clear oil. LC-MS (ESI) calcd for C16H20FNO2 277.15, found 278.2 [M+H+].

Workup

  1. stirringAfter shaking
  2. washThe organic layer was further washed with saturated aqueous sodium bicarbonate solution (100 mL), saturated aqueous brine solution (100 mL)
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-d1ef371d9dcf41c1ae3e8e02c4cfb54b
Source dataset
uspto-grants-2011_05
Patent number
US07939524B2

Reaction notes

Loading…