Dibenzyl carbonate → HCID 70925639, compound

Participants

Reaction Conditions

Reaction Steps

In a flame-dried 50 ml three necked flask under argon atmosphere were dissolved 1.27 g (10.0 mmol) of 5,5-dimethylpyrrolidin-2-one in 10 ml of dry THF. After cooling to −75° C., a 2 M solution of lithium diisopropylamide in THF (10.5 ml, 10.5 mmol) was added dropwise maintaining the temperature below −73° C. The solution was stirred for 1 h at −75° C. Then a solution of dibenzyl carbonate (2.72 g, 11.0 mmol) in 5 ml of THF was added dropwise at −75° C., allowed to warm up to r.t. and stirred for 1 h. The reaction was quenched by addition of 5 ml of saturated ammonium chloride solution. After extraction with ethyl acetate/water, drying over sodium sulfate and concentration; the residue was loaded onto a 50 g prepacked flash chromatography column. After elution with a 10% to 70% ethyl acetate in heptane gradient, the fractions containing the desired product were collected to yield 1.07 g (41%) of the title compound as a light yellow oil, MS: m/e=262.2 (M+H+).

Provenance & Evidence