Sodium Chloride → 5-Methoxy-3-pyridinecarboxaldehyde

Temperature

-60 °C

To a solution of 3-Bromo-5-methoxypyridine (2.5 g, 13.3 mmol) in anhydrous diethyl ether cooled to −100° C. was added n-butyllithium (2.5M soln in hexanes: 5.85 mL, 14.6 mmol) dropwise whilst maintaining an internal temperature <−94° C. After subsequent stirring for 30 minutes, anhydrous DMF (1.34 mL, 17.3 mmol) was added and the reaction mixture allowed to warm to −60° C.. The solution was then poured into sat'd. aq. NaCl soln. and extracted with diethyl ether (3×100 mL), the ethereal phase dried (K2CO3), filtered and evaporated in vacuo. The residue was purified on silica gel eluting with a gradient of 0 to 30% EtOAc in hexanes to afford the title material as an oil.

1. temperature5.85 mL, 14.6 mmol) dropwise whilst maintaining an internal temperature <−94° C
2. additionThe solution was then poured into sat'd
3. extractionand extracted with diethyl ether (3×100 mL)
4. dry with materialthe ethereal phase dried (K2CO3)
5. filtrationfiltered
6. customevaporated in vacuo
7. customThe residue was purified on silica gel eluting with a gradient of 0 to 30% EtOAc in hexanes

ORD record

ord-3cf95453dab6431dba644fcd21ce2bba

Source dataset

uspto-grants-2008_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07405302B2