Diethyl Carbonate → Ethyl 2-(6-chloropyridin-2-yl)acetate

To a solution of n-BuLi (100 mL, 250 mmol of a 2.5 M solution in hexanes) in THF (200 mL) was added DIA (36 mL, 255 mmol) at 0° C. After stirring for 45 min, 6-methyl-2-chloropyridine (14.2 g, 111 mmol) was added slowly, maintaining the temperature <5° C. After 30 min, diethyl carbonate (30 mL, 250 mmol) was added dropwise maintaining the temperature below 10° C. The solution was stirred at 0° C. for 1 h, then water was slowly added, followed by the addition of a saturated solution of NH4Cl. The organic phase was dried (Na2SO4), filtered, and then concentrated under reduced pressure. The residue was purified through a pad of silica gel to give the product (13.3 g, 66.6 mmol) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 1.27 (t, 3H), 2.04 (s, 2H), 4.19 (q, 2H), 7.23 (dd, 2H), 7.62 (t, 1H).

1. temperaturemaintaining the temperature <5° C
2. waitAfter 30 min
3. temperaturemaintaining the temperature below 10° C
4. stirringThe solution was stirred at 0° C. for 1 h
5. dry with materialThe organic phase was dried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified through a pad of silica gel

ORD 기록

ord-dbdb2b9439a9430ba5b65ea88cf25336

출처 데이터셋

uspto-grants-2011_03

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US07906653B2