Ammonium Chloride → HCID 69211802, Verbindung

Temperatur

-40 °C

To a solution of LDA (2M, 9.1 mL, 18.17 mmol) at −70° C. was added HMPA(10 mL) followed by the drop wise addition of a solution of the compound of example 27 (6.12 g, 15.14 mmol) in anhydrous THF (10 mL). The reaction mixture was allowed to warm up to −40° C. and was stirred for another 30 minutes, after which, a solution of tert-butyl bromoacetate (2.5 mL, 16.65 mmol) in anhydrous THF (10 mL) was added. The reaction mixture was stirred for 1 h at the same temperature and then allowed to warm up to room temperature followed by stirring for 24 h. The reaction mixture was portioned between ether and saturated ammonium chloride. The water phase was extracted several times with ether. The recombined organic layer was washed with brine, dried, filtered and evaporated. Silica gel chromatography using 5% ethyl acetate in hexanes provided the product as a light yellow oil. 1H-NMR(CDCl3, 400 MH: 1.24(t, J=7.1 Hz, 3H); 1.43(s, 9H); 1.40–1.57(m, 4H); 2.15(m, 2H); 2.24(m, 1H); 2.58(m, 2H); 4.12(q, J=7.1 Hz, 2H), 7.19–7.23, 7.26–7.30, 7.41(m, 15H).

1. stirringThe reaction mixture was stirred for 1 h at the same temperature
2. temperatureto warm up to room temperature
3. stirringby stirring for 24 h
4. extractionThe water phase was extracted several times with ether
5. washThe recombined organic layer was washed with brine
6. customdried
7. filtrationfiltered
8. customevaporated

ORD-Eintrag

ord-9e075e6494f64081b985da2f0e4f6994

Quelldatensatz

uspto-grants-2006_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07105539B2