Diisopropylethylamine → 6-Benzyl-3-methyl-1,6-diazaspiro[3.4]octan-5-one

Participants

Reaction Steps

To a solution of an optically-active compound of 2-(2-benzylaminoethyl)-3-methylazetidine-2-dicarboxylic acid 2 hydrochloride (29.1 g) and N,N-diisopropylethylamine (65 ml) in chloroform (290 ml) was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (41.3 g) at room temperature, and the mixture was stirred for 4 hours. To the reaction mixture were added saturated aqueous sodium bicarbonate solution (200 ml) and water (100 ml), and the mixture was extracted with chloroform (200 ml). The organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent: chloroform/methanol=20/1 to 10/1) to give the titled compound (21.3 g).

Provenance & Evidence