Dimethylformamide → HCID 58746070, compound

HRID 2378471Notes

Reaction equation

[C:1]([O:5][C:6](=[O:18])[NH:7][C:8]1[C:9]2[N:10]([N:15]=[CH:16][CH:17]=2)[C:11](I)=[CH:12][CH:13]=1)([CH3:4])([CH3:3])[CH3:2].[CH3:19][N:20](C=O)C>[C-]#N.[Zn+2].[C-]#N.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[C:1]([O:5][C:6](=[O:18])[NH:7][C:8]1[C:9]2[N:10]([N:15]=[CH:16][CH:17]=2)[C:11]([C:19]#[N:20])=[CH:12][CH:13]=1)([CH3:4])([CH3:3])[CH3:2]

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of (7-iodo-pyrazolo[1,5-a]pyridin-4-yl)-carbamic acid tert-butyl ester (36 mg, 0.1 mmol), zinc cyanide (24 mg, 0.2 mmol), tetrakis(triphenylphosphine) palladium (0) (23 mg, 0.02 mmol), and anhydrous DMF (1 mL) was degassed with argon. Then, the mixture was stirred at 80° C. for 4.5 h, cooled to rt, mixed with EtOAc (6 mL), and filtered. The filtrate was concentrated under reduced pressure. Purification by silica gel flash chromatography eluting with EtOAc/heptane (gradient from 1:4 to 1:2 ratio) gave compound 777E (24 mg, 93%) as a white solid. HPLC: 93% at 3.64 min (retention time) (YMC S5 ODS-A column 4.6×50 mm eluting with 10-90% aqueous methanol over 4 mincontaining 0.2% phosphoric acid, 4 mL/min, monitoring at 220 nm). MS (ES): m/z 259 [M+H]+.

Workup

customwas degassed with argon
temperaturecooled to rt
additionmixed with EtOAc (6 mL)
filtrationfiltered
concentrationThe filtrate was concentrated under reduced pressure
customPurification by silica gel flash chromatography
washeluting with EtOAc/heptane (gradient from 1:4 to 1:2 ratio)

Sources & evidence

ORD record: ord-28931f286fed4060af5b3f613b5a1472
Source dataset: uspto-grants-2008_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07470797B2

Reaction notes

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