Allyl bromide → Ethyl 2-allylindane-2-carboxylate

To a solution of ethyl indane-2-carboxylate [Schaaf et al., J. Med. Chem. 1983, 26, 328-334] (6.87 g, 36.1 mmol) in THF (100 mL) at −78° C. was added sodium bis(trimethylsilyl)amide (1.0 M in THF, 39.7 mL, 39.7 mmol) dropwise over 20 min. The resulting yellow solution was stirred for 1 h, and then allyl bromide (3.75 mL, 43.3 mmol) was added over 5 min. Stirring was continued for 1.5 h at −78° C., and then the reaction was quenched by the addition of saturated NH4Cl and warmed to ambient temperature. The reaction mixture was partitioned between saturated NH4Cl (100 mL) and EtOAc (100 mL). The aqueous phase was further extracted with EtOAc (2×50 mL), and the combined organic layers were dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with a gradient of hexane:EtOAc—100:0 to 75:25, to give the title compound. MS: m/z=231 (M+1).

1. stirringStirring
2. waitwas continued for 1.5 h at −78° C.
3. customthe reaction was quenched by the addition of saturated NH4Cl
4. customThe reaction mixture was partitioned between saturated NH4Cl (100 mL) and EtOAc (100 mL)
5. extractionThe aqueous phase was further extracted with EtOAc (2×50 mL)
6. dry with materialthe combined organic layers were dried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe crude product was purified by silica gel chromatography
10. washeluting with a gradient of hexane

ORD record

ord-3932af8670264d87a6cad3c1289f4438

Source dataset

uspto-grants-2010_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07851464B2