反应详情

A solution of (S)-(−)-1-Boc-2-pyrrolidine methanol (0.267 g, 1.33 mmol), phenol (0.38 g, 4.02 mmol) and triphenylphosphine (0.71 g, 2.71 mmol) in DCM (5 mL) was cooled in an ice-bath and a solution of diisopropyl azodicarboxylate (0.55 g, 2.71 mmol) in toluene (3 mL) was added. The ice-bath was removed and the reaction mixture was stirred at room temperature over the weekend. The mixture was diluted with ether and washed with sodium hydroxide (3 M), then brine, dried over sodium sulfate and evaporated. The resultant solid was suspended in ethyl acetate and cyclohexane and the resultant white crystalline solid was removed by filtration. The filtrate was evaporated and the crude material was purified by column chromatography using a 10 g Si II cartridge eluting with 10% ethyl acetate in cyclohexane to afford (S)-2-phenoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester as a clear oil (0.22 g).

1. customThe ice-bath was removed
2. additionThe mixture was diluted with ether
3. washwashed with sodium hydroxide (3 M)
4. dry with materialbrine, dried over sodium sulfate
5. customevaporated
6. customcyclohexane and the resultant white crystalline solid was removed by filtration
7. customThe filtrate was evaporated
8. customthe crude material was purified by column chromatography
9. washeluting with 10% ethyl acetate in cyclohexane