Diisopropylamine → 1-tert-Butyl 4-ethyl 4-(prop-2-en-1-yl)piperidine-1,4-dicarboxylate

Participants

Reaction Conditions

Reaction Steps

In a 250 mL round bottom flask was weighed 6.1 g (60 mmol) of diisopropylamine and dissolved in THF (100 mL). This solution was cooled to −78° C. (dry ice/acetone bath). To this solution was added 24 mL of 2.5 M (60 mmol) of butyllithium in hexane and stirred for 15 min, warmed up to 0° C. for 20 min, re-cooled to −78° C. To this mixture was added piperidine-1,4-dicarboxylic acid 1-tert-butyl ester 4-ethyl ester (12.87 g, 50 mmol) in THF (10 mL). There was almost no color change. This was stirred at −78° C. for 45 min. Then, a mixture of 5 g of HMPA and 10.92 g of allyl iodide was added via cannula. The solution was still clear, light yellow color. This mixture was stirred at −78° C. for 20 min, then the dry ice bath was removed and the stirring was continued to allow the reaction mixture warm to r.t. over 40 min. The reaction mixture was poured into ice (˜50 g), saturated NH4Cl aq. (50 mL) and ether (50 mL). The two layers were separated; the aqueous layer was extracted with ether (3×50 mL). The combined organic layers were washed with brine, dried (K2CO3), filtered, and concentrated in vacuo to obtain 15 g (100%) of the title compound as a yellow liquid,

Provenance & Evidence