反应详情

tert-Butyldimethylsilyl triflate (1.44 ml) was added to a stirred solution of 1-tert-butyl 2-methyl (2R,4S)-4-hydroxypyrrolidine-1,2-dicarboxylate (1.03 g) and triethylamine (1.76 ml) in DCM (50 ml) at room temperature, under an atmosphere of nitrogen. The reaction mixture was stirred for 2 hours and then the mixture was washed with saturated aqueous potassium hydrogensulfate, dried (Na2SO4), and concentrated in vacuo to give a clear oil. Purification by column chromatography, using 0-30% ethyl acetate in hexane as eluent, gave 1-tert-butyl 2-methyl (2R,4S)-4-{[tert-butyl(dimethyl)silyl]oxy}pyrrolidine-1,2-dicarboxylate as a clear oil (891 mg, 59%); NMR spectrum (CDCl3) 4.43-4.32 (m, 2H), 3.75-3.72 (m, 2H), 3.65-3.56 (m, 1H), 3.43-3.31 (m, 1H), 2.21-2.15 (m, 1H), 2.07-1.98 (m, 1H), 1.47 (s, 3H), 1.42 (s, 6H), 0.88 (s, 9H), 0.07 (s, 6H).

1. washthe mixture was washed with saturated aqueous potassium hydrogensulfate
2. dry with materialdried (Na2SO4)
3. concentrationconcentrated in vacuo
4. customto give a clear oil
5. customPurification by column chromatography