Dichloromethane → 4-methyl-2-((4-nitro-3-vinyl-1H-indazol-1-yl)methyl)thiazole

HRID 79471Notes

Reaction equation

I[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][C:9]=2[N+:11]([O-:13])=[O:12])[N:4]([CH2:14][C:15]2[S:16][CH:17]=[C:18]([CH3:20])[N:19]=2)[N:3]=1.[CH2:21](N(CC)CC)[CH3:22].[B-](F)(F)(F)C=C.[K+].ClCCl>CC(O)C.C1COCC1>[CH3:20][C:18]1[N:19]=[C:15]([CH2:14][N:4]2[C:5]3[C:10](=[C:9]([N+:11]([O-:13])=[O:12])[CH:8]=[CH:7][CH:6]=3)[C:2]([CH:21]=[CH2:22])=[N:3]2)[S:16][CH:17]=1

Participants

Conditions

Temperature: 90 °C

Procedure

A suspension of 2-((3-iodo-4-nitro-1H-indazol-1-yl)methyl)-4-methylthiazole (0.414 g, 1.03 mmol) in IPA/THF (4:1; 15 mL) was degassed with argon, treated with triethylamine (0.433 mL, 3.10 mmol), potassium trifluoro(vinyl)borate (0.416 g, 3.10 mmol) and 1,1′-bis(diphenylphosphino)ferrocene palladium (II) chloride complex with dichloromethane (0.0845 g, 0.103 mmol). The mixture was heated at 90° C. for 14 hours under argon. The mixture was filtered through glass fiber filter paper, concentrated under reduced pressure and purified by silica gel chromatography (10-75% EtOAc in hexanes) to provide 4-methyl-2-((4-nitro-3-vinyl-1H-indazol-1-yl)methyl)thiazole (0.249 g, 80% yield) as an amber gum.

Workup

customwas degassed with argon
filtrationThe mixture was filtered through glass fiber
filtrationfilter paper
concentrationconcentrated under reduced pressure
custompurified by silica gel chromatography (10-75% EtOAc in hexanes)

Sources & evidence

ORD record: ord-a31ab11f0afc4773a5372ba13f582d0a
Source dataset: uspto-grants-2014_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08841455B2

Reaction notes

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