Aluminum(III) Chloride → HCID 23288871, compound

Participants

Reaction Steps

A suspension of lithium aluminum hydride (1.9 g, 50 mmol) in THF (250 ml) is cooled to -20° under a nitrogen atmosphere. Aluminum chloride (6.7 g, 50 mmol) is added slowly via a powder funnel and the mixture is stirred for 10 min. A mixture of 4-[(indan-1-yl)acetyl]-1-(4-methoxyphenyl)piperazine (CXI, EXAMPLE 68, 8.76 g, 25 mmol) in THF (100 ml) is added dropwise over 10 min. The mixture is allowed to warm to 0°-5° and stirred for 1 hr. The reaction is quenched with sodium hydroxide (20%) and extracted with methylene chloride (2×800 ml). The organic phase is washed with water, saline, dried (magnesium sulfate), filtered and concentrated under reduced pressure. The concentrate is purified by liquid chromatography on silica gel 60 (230-400 mesh, 400 g), eluting with hexane/ethyl acetate (1/2). The appropriate fractions homogeneous by TLC are combined and concentrated under reduced pressure to give the free base of the title compound, which is converted into the hydrochloric acid salt and crystallized from ethyl acetate/methanol to give the title compound, mp 237°-239°; NMR (CDCl3, TMS) 7.80-6.92, 3.84 and 4.82-1.50 δ.

Provenance & Evidence