Ammonia → t-butyl 2-((2R,4R)-4-(2-aminoethyl)-1,5-dioxaspiro[5.5]undecan-2-yl)acetate

HRID 2372134Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2372134
[C:1]([CH2:3][C@H:4]1[O:9][C:8]2([CH2:14][CH2:13][CH2:12][CH2:11][CH2:10]2)[O:7][C@@H:6]([CH2:15][C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:5]1)#[N:2].N.[H][H]>CO.O>[NH2:2][CH2:1][CH2:3][C@H:4]1[O:9][C:8]2([CH2:14][CH2:13][CH2:12][CH2:11][CH2:10]2)[O:7][C@@H:6]([CH2:15][C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:5]1

Komponenten

6

Edukt 3

HCID 222AmmoniaHCID 15045166(+/-)-cis-1,1-Dimethylethyl 4-(cyanomethyl)-1,5-dioxaspiro[5.5]undecane-2acetateHCID 178418361HCID 178418361, Verbindung

Produkt 1

HCID 15045168t-butyl 2-((2R,4R)-4-(2-aminoethyl)-1,5-dioxaspiro[5.5]undecan-2-yl)acetateAusbeute 97,9 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962WaterKatalysatorHCID 887MethanolLösungsmittel

Versuchsvorschrift

A solution of 1.19 g of (±)-cis-1,1-dimethylethyl 4-(cyanomethyl)-1,5-dioxaspiro[5.5]undecane-2-acetate in 30 mL of methanol saturated with gaseous ammonia is treated with 0.3 g of Raney nickel #30 and hydrogen gas in a shaker at 50 pounds per square inch gage (psig) and 40° C. After 22 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 silica gel flash chromatography (30:20:1; ethyl acetate:methanol:ammonium hydroxide) to give 1.18 g of (±)-cis-1,1-dimethylethyl 4-(2-aminoethyl)- 1,5-dioxaspiro[5.5]undecane-2-acetate as a clear oil which solidifies upon standing.

Aufarbeitung

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

Quellen und Nachweise

ORD-Eintrag
ord-61416b044f204b2bbd176bba356361a4
Quelldatensatz
uspto-grants-1992_03
Patentnummer
US05097045

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