Cesium carbonate → 1-[2-[[(1,1-Dimethylethyl)dimethylsilyl]oxy]ethyl]-4-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]piperidine

HRID 2090442Notes

Reaction equation

Cl.[CH3:2][C:3]1([CH3:21])[C:7]([CH3:9])([CH3:8])[O:6][B:5]([C:10]2[CH:11]=[N:12][N:13]([CH:15]3[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]3)[CH:14]=2)[O:4]1.Br[CH2:23][CH2:24][O:25][Si:26]([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:28])[CH3:27].C(=O)([O-])[O-].[Cs+].[Cs+]>C(#N)C.C(OCC)(=O)C>[Si:26]([O:25][CH2:24][CH2:23][N:18]1[CH2:19][CH2:20][CH:15]([N:13]2[CH:14]=[C:10]([B:5]3[O:6][C:7]([CH3:8])([CH3:9])[C:3]([CH3:21])([CH3:2])[O:4]3)[CH:11]=[N:12]2)[CH2:16][CH2:17]1)([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:28])[CH3:27]

Participants

Conditions

Temperature: 90 °C

Procedure

A mixture of 4-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]piperidine HCl salt (0.040 g, 0.13 mmol), (2-bromoethoxy)(tert-butyl)dimethylsilane (55 uL, 0.26 mmol), and cesium carbonate (120 mg, 0.38 mmol) in acetonitrile (1 mL) was stirred at 90° C. overnight. After cooling it was diluted with ethyl acetate. Then the organic solution was washed with water, brine; dried over Na2SO4. After filtration the filtrate was concentrated to yield 50 mg of the product which was directly used in the next step reaction without further purification.

Workup

temperatureAfter cooling it
washThen the organic solution was washed with water, brine
dry with materialdried over Na2SO4
filtrationAfter filtration the filtrate
concentrationwas concentrated

Sources & evidence

ORD record: ord-7cebece401204713a3b75399ba5c72a9
Source dataset: uspto-grants-2013_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08436008B2

Reaction notes

Loading…