Potassium Carbonate → (5S)-3-bromo-7-(3-pyridinyl)spiro[chromeno[2,3-b]pyridine-5,4'-[1,3]oxazol]-2'-amine

HRID 1970384Notes

Reaction equation

[N:1]1[CH:6]=[CH:5][CH:4]=[C:3](B(O)O)[CH:2]=1.C(=O)([O-])[O-].[K+].[K+].[Br:16][C:17]1[CH:18]=[C:19]2[C@:30]3([CH2:34][O:33][C:32]([NH2:35])=[N:31]3)[C:29]3[C:24](=[CH:25][CH:26]=[C:27](I)[CH:28]=3)[O:23][C:20]2=[N:21][CH:22]=1.O1CCOCC1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O>[Br:16][C:17]1[CH:18]=[C:19]2[C@:30]3([CH2:34][O:33][C:32]([NH2:35])=[N:31]3)[C:29]3[C:24](=[CH:25][CH:26]=[C:27]([C:3]4[CH:2]=[N:1][CH:6]=[CH:5][CH:4]=4)[CH:28]=3)[O:23][C:20]2=[N:21][CH:22]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A vial charged with pyridin-3-ylboronic acid (0.295 g, 2.401 mmol), palladiumtetrakis (0.126 g, 0.109 mmol), potassium carbonate (1.509 g, 10.92 mmol), and (S)-3-bromo-7-iodo-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-oxazol]-2′-amine (1.000 g, 2.183 mmol) was treated with 11 mL dioxane followed by 4.5 mL water. The vial was flushed with argon and was heated to 80° C. for 4 hours. The reaction mixture was diluted with EtOAc and dried over MgSO4. The organics were then concentrated, and the crude residue was purified by column chromatography yielding (S)-3-bromo-7-(pyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-oxazol]-2′-amine.

Workup

customThe vial was flushed with argon
additionThe reaction mixture was diluted with EtOAc
dry with materialdried over MgSO4
concentrationThe organics were then concentrated
customthe crude residue was purified by column chromatography

Sources & evidence

ORD record: ord-afcb04315e6e40669690acfada13943d
Source dataset: uspto-grants-2013_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08426447B2

Reaction notes

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