Water → (2-(3-(Benzyloxy)-6-chloropyridin-2-yl)pyrazolo[1,5-a]pyridin-3-yl)methanol

HRID 1776899Notes

Reaction equation

[CH2:1]([O:8][C:9]1[C:10]([C:16]#[C:17][CH2:18][OH:19])=[N:11][C:12]([Cl:15])=[CH:13][CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[I-].[NH2:21][N+:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1.C1CCN2C(=NCCC2)CC1.O>CC#N>[CH2:1]([O:8][C:9]1[C:10]([C:16]2[C:17]([CH2:18][OH:19])=[C:23]3[CH:24]=[CH:25][CH:26]=[CH:27][N:22]3[N:21]=2)=[N:11][C:12]([Cl:15])=[CH:13][CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of compound 3-(3-(benzyloxy)-6-chloropyridin-2-yl)prop-2-yn-1-ol (1.9 g, 6.9 mmol), 1-aminopyridinium iodide (2.3 g, 10.4 mmol) and DBU (2.2 g, 14 mmol) in MeCN (15 mL) was stirred at 80° C. for 2 hours. Water (15 mL) was added and the mixture was extracted with ethyl acetate. The organic layer was washed with brine and dried over Na2SO4. After concentrated, the resulting residue was purified using column chromatography (petroleum ether:ethyl acetate=1:1) to provide the product of compound (2-(3-(benzyloxy)-6-chloropyridin-2-yl)pyrazolo[1,5-a]pyridin-3-yl)methanol (1.2 g, yield: 47%). 1H-NMR (CDCl3, 400 MHz) δ 8.42 (d, J=8.0 Hz, 1H), 7.58 (d, J=8.0 Hz, 1H), 7.37 (d, J=8.0 Hz, 1H), 7.29˜7.22 (m, 3H), 7.21˜7.17 (m, 3H), 7.02 (t, J=8.0 Hz, 1H), 6.76 (dt, J=1.6, 8.0 Hz, 1H), 5.09 (s, 2H), 4.77 (d, J=6.4 Hz, 2H). MS (M+H)+: 366/368.

Workup

extractionthe mixture was extracted with ethyl acetate
washThe organic layer was washed with brine
dry with materialdried over Na2SO4
concentrationAfter concentrated
customthe resulting residue was purified

Sources & evidence

ORD record: ord-2bb5ea1660db457b8d0a60b4efec4b75
Source dataset: uspto-grants-2016_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09265773B2

Reaction notes

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