Dimethylformamide → 4-[(2S)-4-[(1R)-1-phenylethyl]morpholin-2-yl]benzaldehyde

Participants

Reaction Conditions

Reaction Steps

To a solution of (2S)-2 (4-bromophenyl)-4 ((1R)-1-phenylethyl)morpholine (intermediate 1a, 63.3 g, 183 mmol) in tetrahydrofuran (450 ml) was added n-butyllithium (1.57 M in hexane solution, 175 ml, 275 mmol) at −78° C. and the mixture was stirred for 20 minutes. N,N-dimethylformamide (28.3 ml 365 mmol) was added and the mixture was stirred for 2 hours at −78° C. and then allowed to be warmed to −10° C. The reaction was quenched with aqueous ammonium chloride, and the resulting solution was partitioned between water and ethyl acetate. The organic layer was washed with water and brine and dried over sodium sulfate. The solvent was evaporated under reduced pressure to afford crude 4-((2S)-4 ((1R)-1-phenylethyl) morpholin-2-yl)benzaldehyde (intermediate 14, 55.1 g). This compound was used without further purification.

Provenance & Evidence