Chloromethyl Methyl Ether → 1-Tert-butyl 4-ethyl 4-(methoxymethyl)piperidine-1,4-dicarboxylate

HRID 216058Notes

Reaction equation

[N:1]1([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:6][CH2:5][CH:4]([C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH2:3][CH2:2]1.[Li+].CC([N-]C(C)C)C.[CH3:27][O:28][CH2:29]Cl.C(OCC)(=O)C>C1COCC1>[CH3:27][O:28][CH2:29][C:4]1([C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH2:3][CH2:2][N:1]([C:12]([O:14][C:15]([CH3:17])([CH3:16])[CH3:18])=[O:13])[CH2:6][CH2:5]1

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 1-tert-butyl 4-ethyl piperidine-1,4-dicarboxylate (1.0 g, 4.07 mmol) in THF (20 mL) at −78° C. under nitrogen was added dropwise LDA (1.5 M in THF, 4.0 mL, 6.10 mmol). This solution was stirred for 1 hour at −78° C., after which methoxymethyl chloride (0.8 mL, 10.5 mmol) was added. The system was allowed to warm slowly to room temperature over 2 hours. The reaction was quenched with aqueous NH4Cl and extracted with ethyl acetate (3×50 mL). The organic layer was dried over a pad of silica gel, and the solvent removed under vacuum. The title compound was isolated by silica gel chromatography (5-10% ethyl acetate:hexanes) as a clear oil (830 mg, 69% yield). MS (ES+) [M+H]+=302.4.

Workup

temperatureto warm slowly to room temperature over 2 hours
customThe reaction was quenched with aqueous NH4Cl
extractionextracted with ethyl acetate (3×50 mL)
customThe organic layer was dried over a pad of silica gel
customthe solvent removed under vacuum

Sources & evidence

ORD record: ord-64630828c7a74486bf767ed83a3bde62
Source dataset: uspto-grants-2012_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08193202B2

Reaction notes

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