Pyridine → 2-(2-(2-Allyloxy-ethoxy)-ethoxy)-1-bromo-ethane

To a stirred solution of alcohol (15) (3.83 g, 20.1 mmol, 1.0 equiv.) and pyridine (0.16 mL, 2.00 mmol, 0.1 equiv.) in Et2O (20 mL) was added dropwise phosphorus tribromide (0.74 mL, 7.60 mmol, 0.36 equiv.) at 0° C. After 30 min, the reaction was allowed to warm to room temperature. As the reaction was not completed after 12 h, pyridine (1.60 mL, 20.0 mmol, 1.0 equiv.) and sodium bromide (4.14 g, 40.2 mmol, 2.0 equiv.) were successively added. After 12 h of reflux, the resulting solution was submitted to a EtOAc/NH4Cl-saturated aqueous solution extraction. The combined organic phases were dried over anhydrous Na2SO4, filtered then evaporated under reduced pressure. Purification was achieved by column chromatography (Hexanes/EtOAc gradient) to afford bromide (16) (0.90 g, 18%) as a yellow oil; 1H NMR (300 MHz, CDCl3) δ 5.93 (ddt, J=17.3, 10.5, 5.7 Hz, 1H), 5.28 (dq, J=17.3, 1.5 Hz, 1H), 5.19 (dq, J=10.5, 1.5 Hz, 1H), 4.03 (dt, J=5.7, 1.5 Hz, 2H), 3.82 (t, J=6.3 Hz, 2H), 3.71-3.65 (m, 6H), 3.64-3.59 (m, 2H), 3.48 (t, J=6.3 Hz, 2H); 13C NMR (75 MHz, CDCl3) δ 134.9, 117.4, 72.5, 71.4, 70.9, 70.8, 70.7, 69.6, 30.5.

1. waitAs the reaction was not completed after 12 h
2. temperatureAfter 12 h of reflux
3. extractionthe resulting solution was submitted to a EtOAc/NH4Cl-saturated aqueous solution extraction
4. dry with materialThe combined organic phases were dried over anhydrous Na2SO4
5. filtrationfiltered
6. customthen evaporated under reduced pressure
7. customPurification

ORD-Eintrag

ord-751bd9425d6649c2bef188ec13410e81

Quelldatensatz

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08491958B2