反应详情

To a solution of THF (200 mL) and MeOH (11 mL) was added LiBH4 (2 M, 89 mL, 0.18 mol). Some gas evolution and a small exotherm were observed. The reaction was aged at room temperature for 30 min before being cooled to −10° C.±benzyl 2-methyl-5-oxopiperidine-1-carboxylate (22.0 g, 0.089 mol) was then added dropwise, keeping the temperature below −5° C. The reaction was then aged at −10° C. for 30 min. The reaction was quenched by adding half-saturated, aqueous NaHCO3, then extracted with EtOAc. The layers were separated and the organics dried with MgSO4. The organics were concentrated to give crude ±benzyl-5-hydroxy-2-methylpiperidine-1-carboxylate as a crude, colorless oil.

1. additionwas then added dropwise
2. customthe temperature below −5° C
3. waitThe reaction was then aged at −10° C. for 30 min
4. customThe reaction was quenched
5. additionby adding half-saturated
6. extractionaqueous NaHCO3, then extracted with EtOAc
7. customThe layers were separated
8. dry with materialthe organics dried with MgSO4
9. concentrationThe organics were concentrated