Ammonia → (4R,6R)-tert-Butyl-6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxane-4-acetate

HRID 1029834Notes

Reaction equation

HRID 1029834 reaction equation
[C:1]([CH2:3][C@H:4]1[O:9][C:8]([CH3:11])([CH3:10])[O:7][C@@H:6]([CH2:12][C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:5]1)#[N:2].N.[H][H]>CO.[Ni]>[NH2:2][CH2:1][CH2:3][C@H:4]1[O:9][C:8]([CH3:11])([CH3:10])[O:7][C@@H:6]([CH2:12][C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:5]1

Participants

6

Reactant 3

HCID 222AmmoniaHCID 27342871,1-Dimethylethyl (4R,6R)-6-(cyanomethyl)-2,2-dimethyl-1,3-dioxane-4-acetateHCID 178418361HCID 178418361, compound

Product 1

HCID 2734288(4R,6R)-tert-Butyl-6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxane-4-acetate

Reagents, catalysts & solvents 2

HCID 935NickelCatalystHCID 887MethanolSolvent

Procedure

A solution of (4R-cis)-1,1-dimethylethyl 6-cyanomethyl-2,2-dimethyl-1,3-dioxane-4-acetate, (Example 1) 5.63 g (0.048 mol), in 100 mL of methanol saturated with gaseous ammonia is treated with 0.5 g of Raney nickel 190 30 and hydrogen gas in a shaker at 50 pounds per square inch (psi) and 40° C. After 16 hours, thin layer chromatography indicates no starting nitrile present. The suspension is cooled, filtered through filter aid, and concentrated to an oil. This crude oil is purified by flash chromatography on silica gel with 30:20:1 (ethyl acetate:methanol:ammonium hydroxide) as eluant to give 4.93 g of (4R-cis)-1,1-dimethylethyl 6-(2-aminoethyl)- 2,2-dimethyl-1,3-dioxane-4-acetate (98.2 area %) as a clear oil.

Workup

  1. temperatureThe suspension is cooled
  2. filtrationfiltered
  3. filtrationthrough filter aid
  4. concentrationconcentrated to an oil
  5. customThis crude oil is purified by flash chromatography on silica gel with 30:20:1 (ethyl acetate:methanol:ammonium hydroxide) as eluant

Sources & evidence

ORD record
ord-81a4780d5cbf44669b5240ab4a89aa1d
Source dataset
uspto-grants-1992_04
Patent number
US05103024

Reaction notes

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