Methyl iodide → Tert-butyl 2-methyl-1-oxo-4-phenyl-2,8-diazaspiro[4.6]undecane-8-carboxylate

HRID 1036707Notes

Reaction equation

[O:1]=[C:2]1[C:6]2([CH2:12][CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:8][CH2:7]2)[CH:5]([C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH2:4][NH:3]1.[Li+].[CH3:27][Si]([N-][Si](C)(C)C)(C)C.IC>C1COCC1>[CH3:27][N:3]1[CH2:4][CH:5]([C:20]2[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=2)[C:6]2([CH2:12][CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:18])([CH3:19])[CH3:17])=[O:14])[CH2:8][CH2:7]2)[C:2]1=[O:1]

Participants

Conditions

Temperature: 0 °C

Procedure

A diastereomeric mixture. of tert-butyl 1-oxo-4-phenyl-2,8-diazaspiro[4.6]undecane-8-carboxylate (step 4) (669.5 mg; 1.944 mmol) in THF (19.5 ml) under nitrogen was cooled in an ice/brine bath. 1M LHMDS (2.5 ml, 2.53 mmol) was added and the mixture was stirred at 0° C. for 40 minutes. Iodomethane (182 ul, 2.92 mmol) was added and the mixture was allowed to warm slowly to RT overnight. The reaction was quenched with saturated ammonium chloride solution and extracted with EtOAc. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated in vacuo. Purification by chromatography on silica eluting with EtOAc afforded the title compound;

Workup

temperatureto warm slowly to RT overnight
customThe reaction was quenched with saturated ammonium chloride solution
extractionextracted with EtOAc
washThe combined organic extracts were washed with brine
dry with materialdried (MgSO4)
concentrationconcentrated in vacuo
customPurification by chromatography on silica eluting with EtOAc

Sources & evidence

ORD record: ord-0d34bff90dd24ab1b48433a9faf67dd4
Source dataset: uspto-grants-2013_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08546416B2

Reaction notes

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