Potassium Phosphate, Tribasic → 2-Cyclopropyl-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carbaldehyde

HRID 446930Notes

Reaction equation

Br[C:2]1[N:3]=[C:4]2[C:10]([CH:11]=[O:12])=[CH:9][N:8]([CH2:13][O:14][CH2:15][CH2:16][Si:17]([CH3:20])([CH3:19])[CH3:18])[C:5]2=[N:6][CH:7]=1.[CH:21]1(B(O)O)[CH2:23][CH2:22]1.C1(P(C2CCCCC2)C2CCCCC2)CCCCC1.[O-]P([O-])([O-])=O.[K+].[K+].[K+]>C1(C)C=CC=CC=1.O.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH:21]1([C:2]2[N:3]=[C:4]3[C:10]([CH:11]=[O:12])=[CH:9][N:8]([CH2:13][O:14][CH2:15][CH2:16][Si:17]([CH3:20])([CH3:19])[CH3:18])[C:5]3=[N:6][CH:7]=2)[CH2:23][CH2:22]1

Participants

Conditions

Temperature: 100 °C

Procedure

A mixture of 2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carbaldehyde (0.33 g, 0.93 mmol), cyclopropyl boronic acid (0.12 g, 1.39 mmol), tricyclohexyl phosphine (0.026 g, 0.09 mmol), palladium(II) acetate (0.01 g, 0.046 mmol) and potassium phosphate tribasic (0.63 g, 2.97 mmol) in 4 mL of toluene and 0.5 mL of water was flushed with Argon for 5 min then heated at 100° C. for 18 h. The cooled mixture was filtered through a pad of Celite, washed with EtOAc, and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 10% EtOAc/hexanes to afford 0.24 g (81%) of 2-cyclopropyl-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carbaldehyde as a yellow powder.

Workup

customwas flushed with Argon for 5 min
filtrationThe cooled mixture was filtered through a pad of Celite
washwashed with EtOAc
concentrationconcentrated under reduced pressure
customThe residue was purified by silica gel chromatography
washeluting with 10% EtOAc/hexanes

Sources & evidence

ORD record: ord-6ab087523c3d496fbe50bb13963a798e
Source dataset: uspto-grants-2013_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08481541B2

Reaction notes

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