反应详情

温度

50 °C

(2S)-N-(cyanomethyl)-2-hydroxy-4-methylpentanamide from example 67 step 1 (22.5 g, 0.132 mol) and (1R)-(-1-10-camphorsulfonic acid (2.85 g, 0.012 mol, 0.1 eg) were added to 1,2-dichloroethane (135 mL) and the suspension was heated to 50° C. (4-bromophenyl)(phenyl)methyl 2,2,2-trichloroethanimidoate (50 g, 0.123 mol, 0.93 eg) was added portionwise over 15 min. then reaction mixture was stirred at 50° C. for 10 min. The reaction was repeated with 2×50 g and 1×69 g of (4-bromophenyl)(phenyl)methyl 2,2,2 trichloroethanimidoate, using same proportions of other reagents. All the batches were combined and evaporated to give a dark red oil (320 g). The latter was dissolved in toluene (600 mL); insoluble material was filtered off and the filtrate was charged on a chromatography column, eluted with 5% EtOAc/toluene to give the title compound.

1. additionwas added portionwise over 15 min.
2. customreaction mixture
3. customevaporated