Cesium carbonate → 2-[3-(2-Fluorobenzyl)-1H-pyrazolo[4,3-b]pyridin-1-yl]-5-nitropyrimidine-4,6-diamine

HRID 1875447Notes

Reaction equation

[F:1][C:2]1[CH:17]=[CH:16][CH:15]=[CH:14][C:3]=1[CH2:4][C:5]1[C:9]2=[N:10][CH:11]=[CH:12][CH:13]=[C:8]2[NH:7][N:6]=1.Cl[C:19]1[N:24]=[C:23]([NH2:25])[C:22]([N+:26]([O-:28])=[O:27])=[C:21]([NH2:29])[N:20]=1.C1(P(C2CCCCC2)C2C=CC=CC=2C2C(C(C)C)=CC(C(C)C)=CC=2C(C)C)CCCCC1.C(=O)([O-])[O-].[Cs+].[Cs+]>C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].CN(C=O)C.C1(C)C=CC=CC=1>[F:1][C:2]1[CH:17]=[CH:16][CH:15]=[CH:14][C:3]=1[CH2:4][C:5]1[C:9]2=[N:10][CH:11]=[CH:12][CH:13]=[C:8]2[N:7]([C:19]2[N:20]=[C:21]([NH2:29])[C:22]([N+:26]([O-:28])=[O:27])=[C:23]([NH2:25])[N:24]=2)[N:6]=1

Participants

Conditions

Temperature: 90 °C

Procedure

A solution of 600 mg (2.64 mmol) of 3-(2-fluorobenzyl)-1H-pyrazolo[4,3-b]pyridine from example 4A, 501 mg (2.64 mmol) of 2-chloro-5-nitropyrimidine-4,6-diamine [Bitterli et al., Helv. Chim. Acta 1951, 34, 835], 48.4 mg (0.053 mmol) of tris(dibenzylideneacetone)dipalladium, 75.5 mg (0.158 mmol) of dicyclohexyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine (XPHOS) and 1.20 g (3.70 mmol) of cesium carbonate in a degassed mixture of 10 ml of toluene and 10 ml of DMF is heated at 90° C. for 4 h. Cooling to room temperature is followed by filtration with suction and washing with THF. The solid is stirred with 100 ml of water and again filtered off with suction. 572 mg (57% of theory) of the desired compound are obtained.

Workup

temperatureCooling to room temperature
filtrationis followed by filtration with suction
washwashing with THF
filtrationagain filtered off with suction

Sources & evidence

ORD record: ord-93104f7e0b9c4c899b6843c9df33bdd6
Source dataset: uspto-grants-2012_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08309551B2

Reaction notes

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