Triethylamine → 3-Ethyl 2-(phenylmethyl) 8-{[(1,1-dimethylethyl)(dimethyl)silyl]oxy}-2-azaspiro[4.5]decane-2,3-dicarboxylate

HRID 535125Notes

Reaction equation

[CH3:1][C:2]([Si:5]([CH3:23])([CH3:22])[O:6][CH:7]1[CH2:21][CH2:20][C:10]2([CH2:14][NH:13][CH:12]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[CH2:11]2)[CH2:9][CH2:8]1)([CH3:4])[CH3:3].C(N(CC)CC)C.[CH:31]1[CH:36]=[CH:35][C:34]([CH2:37][O:38][C:39](Cl)=[O:40])=[CH:33][CH:32]=1>C(Cl)Cl>[CH3:1][C:2]([Si:5]([CH3:23])([CH3:22])[O:6][CH:7]1[CH2:21][CH2:20][C:10]2([CH2:14][N:13]([C:39]([O:38][CH2:37][C:34]3[CH:35]=[CH:36][CH:31]=[CH:32][CH:33]=3)=[O:40])[CH:12]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[CH2:11]2)[CH2:9][CH2:8]1)([CH3:3])[CH3:4]

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of ethyl 8-{[(1,1-dimethylethyl)(dimethyl)silyl]oxy}-2-azaspiro[4.5]decane-3-carboxylate (110) (10.61 g, 31.3 mmol) dissolved in dry DCM, triethylamine was added (10.8 mL, 78 mmol), cooled to 0° C. followed by the addition of Cbz-Cl (6.2 mL, 43.5 mmol), and the reaction stirred at 0° C., for 5 min, rt for 1 h. Reaction diluted with DCM (700 mL), washed with 0.1 N HCl (700 mL), dried (MgSO4) and concentrated in vacuo. The residue was purified by silica gel chromatography eluting with 10-60% hexanes/EtOAc to afford the title compound as a yellow oil (5.73 g, 39% yield).

Workup

customReaction
washwashed with 0.1 N HCl (700 mL)
dry with materialdried (MgSO4)
concentrationconcentrated in vacuo
customThe residue was purified by silica gel chromatography
washeluting with 10-60% hexanes/EtOAc

Sources & evidence

ORD record: ord-58cda8de345745dca77f005be091ab5e
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08853416B2

Reaction notes

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