Reaktion #1511324

Reaktionsgleichung

T3P

4-tert-butyl-1,2-diaminobenzene

N-Boc-L-threonine

triethylamine

→

tert-butyl [(1R,2R)-1-(5-tert-butyl-1H-benzimidazol-2-yl)-2-hydroxypropyl]carbamate

Lösungsmittel

dioxane

dioxane

EtOAc

sodium bicarbonate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturby heating to 100° C. for 18 hours
2. 2
   TemperaturThe reaction was cooled
3. 3
   SonstigeThe organic layer was collected
4. 4
   Waschenwashed with brine
5. 5
   Trocknendried over MgSO4
6. 6
   Einengenconcentrated in vacuo
7. 7
   SonstigeThe residue was purified
8. 8
   Wascheneluting with 15-100% TBME in heptanes

Vorschrift

To a stirred solution of 4-tert-butyl-1,2-diaminobenzene (375 mg, 2.28 mmol) in dioxane (4 mL) was added a solution of N-Boc-L-threonine (500 mg, 2.28 mmol) in dioxane (4 mL) followed by triethylamine (636 μL, 456 mmol) and T3P (1520 mg, 2.40 mmol). The reaction was stirred at room temperature for 10 minutes followed by heating to 100° C. for 18 hours. The reaction was cooled and diluted with EtOAc (50 mL) and saturated aqueous sodium bicarbonate solution (40 mL). The organic layer was collected, washed with brine, dried over MgSO4 and concentrated in vacuo. The residue was purified using silica gel column chromatography eluting with 15-100% TBME in heptanes to afford tert-butyl [(1R,2R)-1-(5-tert-butyl-1H-benzimidazol-2-yl)-2-hydroxypropyl]carbamate.

Quelle