Allyl bromide → HCID 66762615, compound

Participants

Reaction Conditions

Reaction Steps

At 0° C., isobutylmagnesium bromide (2.0 M ether solution, 1.2 eq.) and n-butyl lithium (2.5 M hexane solution, 2.4 eq.) were added to anhydrous THF (0.3 M). After stirring at 0° C. for 30 min, the reaction mixture was cooled to −40° C. and tert-butyl 5-bromo-2-chlorobenzoate from the previous step (1 eq.) was added over 15 min. The now red solution was stirred at −40° C. for 1 h before copper (I) cyanide (30% loading) was added. The resulting suspension was stirred at −40° C. for 15 min and then added allyl bromide (3 eq.). After stirring at −40° C. for another 2 h, the reaction mixture was quenched with sat. aq. NH4Cl and warmed to RT. The biphasic mixture was poured into more sat. aq. NH4Cl and extracted with ether. The combined organic extracts were washed with brine, dried over MgSO4 and filtered. Concentration of the filtrate in vacuo afforded a brown oil. Purification of the crude product thus obtained by way of flash chromatography (SiO2, Hex→19:1 (v/v) Hex:ether) afforded the title compound as a light yellow oil.

Provenance & Evidence