反应详情

29 ml (194 mmol, 1.6 eq) DBU were added to a suspension of 41.4 g (121.4 mmol) (2S,4R)-4-Hydroxy-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid methyl ester in 150 ml acetonitrile at 0° C. To the resulting solution 29.25 g (194 mmol, 1.6 eq) TBDMSCl were added in portions and the reaction was stirred at RT overnight. After concentrating the crude oil was purified by column chromatography with EtOAc/hexane 1:2 on silica gel to give 49.2 g (90%) (2S,4R)-4-(tert-butyl-dimethyl-silanyloxy)-1-(naphthalene-2-sulfonyl)-pyrrolidine-2-carboxylic acid methyl ester.

1. concentrationAfter concentrating the crude oil
2. customwas purified by column chromatography with EtOAc/hexane 1:2 on silica gel