Tert-butyl acetoacetate → HCID 54272216, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 5,5-bis(4-fluoro-2-methylphenyl)-4-(1-methyl-1H-tetrazol-5-yl)-2,4-pentadienal (1.0 g, 2.5 mmoles) in tetrahydrofuran at -50° C. was added the dianion of t-butyl acetoacetate (2.5 mL of a 1M solution, 2.5 mmoles) prepared by adding t-butyl acetoacetate (4.0 g, 25.0 mmoles) in tetrahydrofuran (4 mL) to a suspension of sodium hydride (1.0 g of 60% dispersion, 25.0 mmoles) in tetrahydrofuran at -5° C. followed by cooling to -30 ° C. and the addition of butyl lithium (11.4 mL of 2.2M solution, 25 mmoles). After stirring for 1.5 hours, analytical TLC indicated starting aldehyde and another 0.5 mL of dianion solution was added. The solution was stirred an additional 0.5 hour and quenched with 1N hydrochloric acid. The mixture was extracted with methylene chloride. The extracts were dried and concentrated in vacuo. The residue was purified by column chromatrography on silica gel eluting with methanol in methylene choride to produce 0.6 g of the title compound; m.p.=65°-72° C.

Provenance & Evidence