Tributylvinyltin → Methyl 5-ethenylpyridine-2-carboxylate

The title compound was prepared by following general procedure 2. Methyl 5-bromopyridine-2-carboxylate (4.0 g, 18.5 mmol) was dissolved in 160 mL dioxane. Vinyltributyltin (11.7 g, 37 mmol) was added to this solution at 25° C., followed by addition of dichlorobis(triphenylphosphine)palladium (1.5 g, mmol). The reaction mixture was degassed and purged with nitrogen for 5 min. and then heated at 100° C. for 2 h. The reaction mixture was evaporated under reduced pressure and the residue was purified by SiO2 chromatography (100-200 mesh, eluent: hexane-50% ethyl acetate-hexane gradient). The requisite fractions were concentrated below 40° C. under reduced pressure to obtain 2 g of methyl 5-vinylpyridine-2-carboxylate as a pale yellow oil (solid at −20° C.). TLC Rf 0.3 in 40% Ethyl acetate:Hexane.

1. customThe title compound was prepared
2. customThe reaction mixture was degassed
3. custompurged with nitrogen for 5 min.
4. customThe reaction mixture was evaporated under reduced pressure
5. customthe residue was purified by SiO2 chromatography (100-200 mesh, eluent: hexane-50% ethyl acetate-hexane gradient)
6. concentrationThe requisite fractions were concentrated below 40° C. under reduced pressure

ORD record

ord-7f9c8f6ea5c84d1b928d26cf891a4e6f

Source dataset

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09409910B2