4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole → 6-(1H-pyrazol-4-yl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazolo[4,3-c]pyridine

HRID 57979Notes

Reaction equation

Cl[C:2]1[N:7]=[CH:6][C:5]2[CH:8]=[N:9][N:10]([CH2:11][O:12][CH2:13][CH2:14][Si:15]([CH3:18])([CH3:17])[CH3:16])[C:4]=2[CH:3]=1.CC1(C)C(C)(C)OB([C:27]2[CH:28]=[N:29][NH:30][CH:31]=2)O1>C([O-])([O-])=O.[Na+].[Na+].O1CCOCC1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[NH:29]1[CH:28]=[C:27]([C:2]2[N:7]=[CH:6][C:5]3[CH:8]=[N:9][N:10]([CH2:11][O:12][CH2:13][CH2:14][Si:15]([CH3:18])([CH3:17])[CH3:16])[C:4]=3[CH:3]=2)[CH:31]=[N:30]1

Participants

Conditions

Temperature: 110 °C

Procedure

A suspension of 6-chloro-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazolo[4,3-c]pyridine (1.30 g, 4.6 mmol), 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (1.16 g, 6 mmol), and Pd(dppf)Cl2 (437 mg, 0.6 mmol) in aq. Na2CO3 (2.0 M, 12 mL) and 1,4-dioxane (20 mL) was heated at 110° C. for 20 hours. The reaction mixture was concentrated under reduced pressure. The residue was purified by silica gel chromatography using ethyl acetate/heptanes 50% to 100% as eluting solvents to afford 6-(1H-pyrazol-4-yl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazolo[4,3-c]pyridine as a yellow oil (670 mg, 46%), and recovered 1 g of the starting material. MS (ESI) m/z: 316 [M+H]+.

Workup

concentrationThe reaction mixture was concentrated under reduced pressure
customThe residue was purified by silica gel chromatography
washas eluting solvents

Sources & evidence

ORD record: ord-d08bd09121604b0c84895928fcefa6cc
Source dataset: uspto-grants-2016_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09434725B2

Reaction notes

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