Ethanol → Tert-butyl (1,3-dioxoisoindolin-2-yl)(ethyl)carbamate

関与物質

反応手順

Diisopropyl azodicarboxylate (2.92 mL, 15.00 mmol) was added in one portion to a solution of tert-butyl 1,3-dioxoisoindolin-2-ylcarbamate (2.62 g, 10 mmol, prepared following the procedure described by Nicolas Brosse et al. in Eur. J. Org. Chem. 4757-4764, 2003), triphenylphosphine (3.93 g, 15.00 mmol) and ethanol (0.691 g, 15.00 mmol) in THF (20 mL) at 0° C. and the reaction solution was stirred at room temperature for 1 h (monitored by TLC until completion). Solvent was evaporated and the residue was purified by flash chromatography on silica gel using an automated ISCO system (80 g column, eluting with 5-35% ethyl acetate/hexanes) to provide tert-butyl 1,3-dioxoisoindolin-2-yl(ethyl)carbamate (2.6 g, 90% yield) as a white solid which was used as it in the next step

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