Dimethylformamide → (+/-)Tert-butyl 7-formyl-8-azaspiro[4.5]decane-8-carboxylate

Participants

Reaction Conditions

Reaction Steps

tert-butyl 8-azaspiro[4.5]decane-8-carboxylate (Intermediate 71, 6 g, 25.07 mmol) dissolved in 150 ml of Et2O was cooled to −78° C., then N,N,N′,N′-tetramethyl ethylendiamine (9.08 ml, 60.16 mmol) and secBuLi 1.4M in hexane (42.95 ml, 60.16 mmol) were added. After 10 minutes at −60° C., the temperature was raised to −20° C. for 60 minutes, then the reaction was cooled to −78° C. and dimethylformamide (4.47 ml, 60.16 mmol, dissolved in 5 ml of Et2O) was added. After 30 minutes a saturated aqueous solution of NH4Cl (30 ml) was slowly added, then reaction was allowed to reach room temperature. Reaction was extracted with Et2O (3×100 ml), the organic solvent was dried (Na2SO4) and evaporated to obtain 4 g of the title compound as yellow oil.

Provenance & Evidence