Tributylvinyltin → HCID 21907008, compound

To a mixture of 6-bromooxindole (Procedure D, 0.50 g, 2.4 mmol), vinyltributylstannane (0.95 g, 3.0 mmol), lithium chloride. (03 g, 7.1 mmol), 2,6-di-tert-butyl-4-methylphenol (0.01 g, 0.05 mmol) in acetonitrile (25 ml) stirring at 80° C. was added dichlorobis(triphenylphosphine)palladium (II). The resulting reaction was stirred with heating for 16 h. The reaction was poured into a vigorously stirring mixture of 5M potassium fluoride solution: ethyl acetate/1:1 (250 mL) and stirred for 0.75 h. The resulting biphashic mixture was filtered through a Celite 521 pad and the pad flushed with ethyl acetate (5×200 mL). The combined organic phases were washed with water (200 mL), saturated sodium chloride (200 mL) and filtered through Whatman PS 1 paper and evaporated in vacuo to a golden yellow syrup. The syrup was titurated with diethyl ether to yield several crops of tan solid. Pure samples were combined, slurried with diethyl ether, filtered, and air dried to yield 0.12 g (31%) of 6-vinyloxindole: 1H NMR (DMSO-d6): δ10.36 (s,1H), 7.13 (d,1H, J=7.7 Hz), 6.98 (d,1H, J=7.5 Hz), 6.66 (dd,1H, J=10.9,17.7 Hz), 5.70 (d,1H, J=17.6 Hz), 5.18 (d,1H, J=10.9 Hz), 3.42 (s,2H).

1. customThe resulting reaction
2. temperaturewith heating for 16 h
3. additionThe reaction was poured into
4. stirringa vigorously stirring
5. filtrationThe resulting biphashic mixture was filtered through a Celite 521 pad
6. customthe pad flushed with ethyl acetate (5×200 mL)
7. washThe combined organic phases were washed with water (200 mL), saturated sodium chloride (200 mL)
8. filtrationfiltered through Whatman PS 1 paper
9. customevaporated in vacuo to a golden yellow syrup
10. customto yield several crops of tan solid
11. filtrationfiltered
12. customair dried

ORD record

ord-b6e7fd74e71342d6b7a2afdd40096d74

Source dataset

uspto-grants-2004_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06818632B2