Reaktion #2254173

Reaktionsgleichung

BnCl

2

((2S,3S,4aR,8R,8aR)-2,3-Dimethoxy-2,3-dimethyloctahydro-[1,4]dioxino[2,3-c]pyridin-8-yl)methanol Hydrochloride

K2CO3

→

title compound

Ausbeute 97.9%

((2S,3S,4aR,8R,8aR)-6-Benzyl-2,3-dimethoxy-2,3-dimethyloctahydro-[1,4]dioxino[2,3-c]pyridin-8-yl)methanol

Ausbeute 97.9%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe reaction was stirred at 40° C. overnight
2. 2
   SonstigeThe solvent was evaporated in vacuo
3. 3
   workup.ADDITIONHCl was added
4. 4
   workup.DISSOLUTIONto dissolve the residue
5. 5
   WaschenThe solution was washed with Et2O
6. 6
   ExtraktionThe solution was extracted with EtOAc (2×)
7. 7
   Waschenthe combined extracts were washed with water
8. 8
   Trocknenbrine and then dried over MgSO4
9. 9
   FiltrationThe solution was filtered
10. 10
    Sonstigethe filtrate evaporated in vacuo

Vorschrift

To a solution of 2 (14.85 g, 50.0 mmol) in DMF (200 mL) was added K2CO3 (17.25 g, 125 mmol) and the mixture was stirred at 40° C. for about 4 hrs. At this point, BnCl (5.7 mL, 50.0 mmol) was added in one portion and the reaction was stirred at 40° C. overnight. The solvent was evaporated in vacuo and the residue was suspended in water (600 mL) and HCl was added to dissolve the residue. The solution was washed with Et2O and then basified with Na2CO3. The solution was extracted with EtOAc (2×) and the combined extracts were washed with water and then brine and then dried over MgSO4. The solution was filtered and the filtrate evaporated in vacuo to give the title compound (17.2 g, >95%) as a colorless to very pale yellow viscous oil which was used without further purification. 1H NMR (CDCl3) 7.3 (m, 5H), 3.6-3.8 (m, 2H), 3.5 (s, 3H), 3.4 (t, 1H), 3.26 (s, 3H), 3.268 (s, 3H), 2.9 (m, 2H), 2.2 (br s, 1H), 2.05 (m, 1H), 1.85 (t, 1H), 1.28 (s, 3H), 1.26 (s, 3H).

Quelle