Pentane → HCID 101043406, compound

To a solution of 2-chloro-6-methoxypyridine (100 g, 696 mmol) in anhydrous THF (1.0 L) was added a solution of tert-BuLi in pentane (1.3 M, 640 mL, 836 mmol) at −68° C. dropwise. The reaction mixture was stirred for 30 min at this temperature. To the reaction mixture was added a solution of ethyl glyoxalate (109 g, 940 mmol) in THF (400 mL) was added dropwise below −60° C. over 1.5 h, and the resulting mixture was stirred at this temperature for 1 h. The reaction mixture was poured into ice water (10 L), extracted with EtOAc (10 L), dried over Na2SO4, and concentrated. The crude product was purified by silica gel column chromatography (petroleum ether→petroleum ether EtOAc=5:1) to afford ethyl 2-(6-chloro-2-methoxypyridin-3-yl)-2-hydroxypropanoate (360 g, 50%) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 1.20 (t, 3H), 1.75 (s, 3H), 3.95 (s, 3H), 4.20 (q, 2H), 6.95 (d, 1H), 7.67 (d, 1H).

1. additionwas added dropwise below −60° C. over 1.5 h
2. stirringthe resulting mixture was stirred at this temperature for 1 h
3. extractionextracted with EtOAc (10 L)
4. dry with materialdried over Na2SO4
5. concentrationconcentrated
6. customThe crude product was purified by silica gel column chromatography (petroleum ether→petroleum ether EtOAc=5:1)

ORD record

ord-6912ff8a7a59499fa97784a83b2416ec

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09278953B2