Tetramethyltin → HCID 178472766, compound

HRID 1746205Notes

Reaction equation

[CH2:1]([O:3][C:4](=[O:23])[CH2:5][NH:6][C:7]([C:9]1[C:10](=[O:22])[S:11][C:12]2[C:17]([C:18]=1[OH:19])=[CH:16][C:15]([Cl:20])=[CH:14][C:13]=2Br)=[O:8])[CH3:2].[CH3:24][Sn](C)(C)C>CN(C)C=O.C(OCC)(=O)C>[CH2:1]([O:3][C:4](=[O:23])[CH2:5][NH:6][C:7]([C:9]1[C:10](=[O:22])[S:11][C:12]2[C:17]([C:18]=1[OH:19])=[CH:16][C:15]([Cl:20])=[CH:14][C:13]=2[CH3:24])=[O:8])[CH3:2]

Participants

Conditions

Temperature: 120 °C

Procedure

[(8-Bromo-6-chloro-4-hydroxy-2-oxo-2H-thiochromene-3-carbonyl)-amino]-acetic acid ethyl ester (500 mg, 1.19 mmol) was dissolved in anhydrous N,N-dimethylformamide (4 mL). Tetramethyl tin (247 μL, 1.783 mmol), dichloro(bis-triphenylphosphino) palladium (125 mg, 0.18 mmol), and 4 angstrom molecular sieves were added sequentially to the reaction. The reaction was sealed and heated to 120° C. in an oil bath for 45 min. The reaction was cooled, diluted with ethyl acetate, and partitioned with water. The organic phase was washed with water, brine, and dried over sodium sulfate. The crude material was purified by silica gel chromatography (15%-45% ethyl acetate in hexanes) to provide [(6-chloro-4-hydroxy-8-methyl-2-oxo-2H-thiochromene-3-carbonyl)-amino]-acetic acid ethyl ester (400 mg, 95%). MS ESI(−) m/e: 354.223 (M−1).

Workup

customThe reaction was sealed
temperatureThe reaction was cooled
custompartitioned with water
washThe organic phase was washed with water, brine
dry with materialdried over sodium sulfate
customThe crude material was purified by silica gel chromatography (15%-45% ethyl acetate in hexanes)

Sources & evidence

ORD record: ord-ed4790391ac945b690f7a764dd84f7cd
Source dataset: uspto-grants-2015_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09149476B2

Reaction notes

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