Lithium diisopropylamide → 3-(2-Bromo-3-oxocyclohex-1-enyl)-1-propyl-2-piperidone

Participants

Reaction Steps

A solution of 1-propyl-2-piperidone (50 mM) in benzene (40 ml) was added dropwise to a solution of lithium di-isopropylamide [ex n-butyl lithium in hexane (32.3 ml, 50 mM), di-isopropylamine (7 ml, 50 mM) and THF (33 ml)]. A solution of 2-bromo-3-methoxycyclohex-2-en-1-one (10.25 g, 50 mM) in THF (40 ml) was added, and after 5 minutes the mixture was quenched by pouring on to excess aqueous hydrochloric acid. Ether extraction followed by passage through a short silica pad using ethyl acetate as eluant gave the title compound as a colourless oil (10.75 g).

Provenance & Evidence