Water → HCID 9920461, Verbindung

Temperatur

-20 °C

A modified procedure of Falck was used (Alcaraz, L. et al., Tetrahedron Letters 1994, 35, 5449). A suspension of trimethylsulfonium iodide (18.2 g, 89.1 mmol) in anhydrous THF (220 ml) was stirred and cooled to −20° C. 1.6 M n-BuLi (55.7 ml, 89.1 mmol) was added slowly and the reaction stirred at −20° C. for 1 h. A solution of epoxide 63 (4.40 g, 29.7 mmol) in anhydrous THF (50.0 ml) was added slowly. The reaction was stirred at −20° C. for 1 h and then allowed to warm to r.t. slowly. The reaction mixture was poured into water (200 ml) and extracted with Et2O (1×200 ml, 1×100 ml). The combined organic phases were washed with saturated NaCl solution (100 ml) before being dried (MgSO4), filtered, and concentrated to give the crude material. This was purified by column chromatography (130 g silica), eluting with petrol/EtOAc (9:1), to give partially purified material. This was re-purified by column chromatography (50 g silica), eluting with petrol/EtOAc (9:1), to give allylic alcohol 66 (3.19 g, 66%) as a pale yellow liquid. The analytical data matched that described for the racemic material above.

1. stirringthe reaction stirred at −20° C. for 1 h
2. stirringThe reaction was stirred at −20° C. for 1 h
3. temperatureto warm to r.t. slowly
4. extractionextracted with Et2O (1×200 ml, 1×100 ml)
5. washThe combined organic phases were washed with saturated NaCl solution (100 ml)
6. dry with materialbefore being dried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated
9. customto give the crude material
10. customThis was purified by column chromatography (130 g silica)
11. washeluting with petrol/EtOAc (9:1)
12. customto give partially purified material
13. customThis was re-purified by column chromatography (50 g silica)
14. washeluting with petrol/EtOAc (9:1)

ORD-Eintrag

ord-7a5dbc805fd84b7b991e7dc7dc0a5a33

Quelldatensatz

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09242954B2