1,4-Dioxane → [6-[2-[Methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]propanoylamino]-2-[2-tri(propan-2-yl)silylethynyl]pyridin-3-yl]boronic acid

HRID 535394Notes

Reaction equation

[C:1]([O:5][C:6](=[O:33])[N:7]([CH:9]([CH3:32])[C:10]([NH:12][C:13]1[CH:18]=[CH:17][C:16](Br)=[C:15]([C:20]#[C:21][Si:22]([CH:29]([CH3:31])[CH3:30])([CH:26]([CH3:28])[CH3:27])[CH:23]([CH3:25])[CH3:24])[N:14]=1)=[O:11])[CH3:8])([CH3:4])([CH3:3])[CH3:2].[B:34]1(B2OCC(C)(C)CO2)[O:39]CC(C)(C)C[O:35]1.CC([O-])=O.[K+].O1CCOCC1>C(Cl)Cl.C1(P(C2C=CC=CC=2)[C-]2C=CC=C2)C=CC=CC=1.[C-]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=C1.[Fe+2].Cl[Pd]Cl>[CH3:8][N:7]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:33])[CH:9]([CH3:32])[C:10]([NH:12][C:13]1[N:14]=[C:15]([C:20]#[C:21][Si:22]([CH:29]([CH3:31])[CH3:30])([CH:26]([CH3:28])[CH3:27])[CH:23]([CH3:25])[CH3:24])[C:16]([B:34]([OH:39])[OH:35])=[CH:17][CH:18]=1)=[O:11]

Participants

Conditions

Temperature: 50 °C

Procedure

A mixture of tert-butyl-N-[1-[[5-bromo-6-[2-tri(propan-2-yl)silylethynyl]pyridin-2-yl]-amino]-1-oxopropan-2-yl]-N-methylcarbamate C1a (51 g, 90 mmol), bis(neopentyl glycolato)diboron (40.5 g, 179 mmol), KOAc (26.4 g, 269 mmol), 1,1′-Bis(diphenyl-phosphino)ferrocene]dichloropalladium(II) (3.3 g, 4.5 mmol) and dioxane (400 ml) is stirred under argon atmosphere for 17 h at 50° C. The mixture is diluted with DCM and extracted with a saturated aqueous solution of NaHCO3. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by NP chromatography. Yield: 21.9 g (48%). HPLC-MS: M+H=504; tR=2.17 min (*Method—4).

Workup

extractionextracted with a saturated aqueous solution of NaHCO3
dry with materialThe combined organic layers are dried over MgSO4
concentrationconcentrated in vacuo
customThe product is purified by NP chromatography

Sources & evidence

ORD record: ord-f5bf572391fd483a8da230d5a5d9f996
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08859541B2

Reaction notes

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