Dimethyl Sulfate → HCID 18457671, compound

HRID 853770Notes

Reaction equation

[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([N:14]2[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH3:20]N(CCN(C)C)C.C([Li])(CC)C.COS(OC)(=O)=O>CCOCC>[C:1]([O:5][C:6]([N:8]1[CH2:9][CH2:10][CH:11]([N:14]2[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]2)[CH2:12][CH:13]1[CH3:20])=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 1′-tert-Butoxycarbonyl-[1,4′]-Bipiperidine 1 (5.1 g, 19.0 mmol), TMEDA (19 mL) in dry Et2O (40 ml) at −78° C. is slowly added a solution of sec-butyllithium (19.0 mL, 24.7 mmol, 1.3 M in cyclohexanes) over a period of 30 min. The mixture is stirred at −78° C. for 3 hr, and then is treated with a solution of dimethylsulfate (3.6 g, 28.5 mmol) in Et2O (5 mL). The cooling bath is removed and the reaction mixture is stirred at ambient temperature for 16 hr. After cooling to 0° C., the reaction mixture is quenched with water, extracted with Et2O (5×100 mL), and the combined ether layers is dried over K2CO3. The solvent is removed under vacuum and the residue is purified by silica gel chromatography (eluting with 40% ethyl acetate in hexane) to give 2.51 g of 1′-tert-butoxycarbonyl-2′-methyl-[1,4′]-bipiperidine, 2.

Workup

customThe cooling bath is removed
stirringthe reaction mixture is stirred at ambient temperature for 16 hr
temperatureAfter cooling to 0° C.
customthe reaction mixture is quenched with water
extractionextracted with Et2O (5×100 mL)
dry with materialthe combined ether layers is dried over K2CO3
customThe solvent is removed under vacuum
customthe residue is purified by silica gel chromatography (eluting with 40% ethyl acetate in hexane)

Sources & evidence

ORD record: ord-3a03d8b6a3ca4f48b0325abd282655eb
Source dataset: uspto-grants-2007_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07256186B2

Reaction notes

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