Carbon Dioxide → 2-(1,3-Dioxolan-2-yl)-1,3-thiazole-5-carboxylic acid

Temperature

-78 °C

To a solution of 2-(1,3-dioxolan-2-yl)thiazole (65 g, 0.41 mol) in THF (900 mL) under nitrogen was slowly added n-BuLi (180 mL, 2.5 M in hexanes) at −78° C. The mixture was stirred at −78° C. for 2 h, and then solid dry ice was added. The solution was then warmed to rt and stirred overnight. Hydrochloric acid (2 N) was added to the solution until pH<4. The mixture was then extracted with ether (5×300 mL). Combined organic phases were washed with water (200 mL), brine (200 mL), dried (Na2SO4), and concentrated to give a yellow solid. This solid was then rinsed with petroleum ether to give 2-(1,3-dioxolan-2-yl)thiazole-5-carboxylic acid (72.5 g, 87%). 1H NMR (dmso-d6, 400 MHz) δ 13.70 (s, 1H), 8.36 (s, 1H), 6.10 (s, 1H), 4.06 (m, 4H).

1. customat −78° C
2. temperatureThe solution was then warmed to rt
3. stirringstirred overnight
4. extractionThe mixture was then extracted with ether (5×300 mL)
5. washCombined organic phases were washed with water (200 mL), brine (200 mL)
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated
8. customto give a yellow solid
9. washThis solid was then rinsed with petroleum ether

ORD record

ord-73d3db55fcc341fe94748cf4e10ff4a3

Source dataset

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09227951B2