Water → Tert-butyl 4-(4-ethynyl-1,3-thiazol-2-yl)piperidine-1-carboxylate

HRID 1465438Notes

Reaction equation

Br[C:2](Br)=[CH:3][C:4]1[N:5]=[C:6]([CH:9]2[CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:11][CH2:10]2)[S:7][CH:8]=1.Cl.C(O)C.O>O1CCCC1>[C:3]([C:4]1[N:5]=[C:6]([CH:9]2[CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:11][CH2:10]2)[S:7][CH:8]=1)#[CH:2]

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of tert-butyl 4-[4-(2,2-dibromovinyl)-1,3-thiazol-2-yl]piperidine-1-carboxylate (1.26 g, 2.79 mmol) in anhydrous tetrahydrofuran (25 ml) was added dropwise at −78° C. a mixture of 1.6M-n-butyllithium-hexane solution (5.2 ml, 8.4 mmol) and anhydrous tetrahydrofuran (10 ml). After stirring at −78° C. for 2 hrs, 1.25M hydrogen chloride-ethanol solution (6.7 ml, 8.4 mmol) was added dropwise to the reaction mixture. The mixture was warmed to room temperature, water was added, and the mixture was extracted with ethyl acetate. The extract was concentrated, and the concentrated residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:9→1:4) to give tert-butyl 4-(4-ethynyl-1,3-thiazol-2-yl)piperidine-1-carboxylate (553 mg, yield 68%) as a yellow solid.

Workup

temperatureThe mixture was warmed to room temperature
extractionthe mixture was extracted with ethyl acetate
concentrationThe extract was concentrated
customthe concentrated residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:9→1:4)

Sources & evidence

ORD record: ord-751db0b2a2d64804ba4dac16c9ce75f2
Source dataset: uspto-grants-2015_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08999989B2

Reaction notes

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