7-Chloro-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine-3-carbaldehyde → 1-[7-Chloro-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridin-3-yl]-2-propyn-1-ol

HRID 1373802Notes

Reaction equation

HRID 1373802 reaction equation
[Cl:1][C:2]1[N:7]2[N:8]=[C:9]([C:13]3[CH:18]=[CH:17][C:16]([F:19])=[CH:15][CH:14]=3)[C:10]([CH:11]=[O:12])=[C:6]2[CH:5]=[CH:4][CH:3]=1.[C:20]([Mg]Br)#[CH:21]>>[Cl:1][C:2]1[N:7]2[N:8]=[C:9]([C:13]3[CH:18]=[CH:17][C:16]([F:19])=[CH:15][CH:14]=3)[C:10]([CH:11]([OH:12])[C:20]#[CH:21])=[C:6]2[CH:5]=[CH:4][CH:3]=1

Participants

3

Reactant 2

HCID 221748437-Chloro-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine-3-carbaldehydeHCID 178418486HCID 178418486, compound

Product 1

HCID 221748491-[7-Chloro-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridin-3-yl]-2-propyn-1-olYield 88.1%

Procedure

In a similar manner as described in Example 7 from 7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridine-3-carbaldehyde (5.49 g, 20.0 mmol) and ethynylmagnesium bromide (100 mL, 0.5 M in tetrahydrofuran, 50.0 mmol) at 0° C., recrystallized from dichloromethane, was obtained 1-[7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridin-3-yl]-2-propyn-1-ol (5.3 g, 88%) as a pale yellow crystalline solid. 1H NMR (CDCl3): δ 8.04 (d, 1H), 7.79 (m, 2H), 7.20 (m, 3H), 7.01 (d, 1H), 5.77 (m, 1H), 2.69 (d, 1H), 2.32 (d, 1H); MS m/z 301 (M+1).

Workup

  1. customrecrystallized from dichloromethane

Sources & evidence

ORD record
ord-e14ab060b4bc4d5ab77389da68faa2b9
Source dataset
uspto-grants-2007_01
Patent number
US07163940B2

Reaction notes

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