2-Chlorophenol → (E)-3-(2-chloro-phenoxy)-but-2-enoic acid ethyl ester

온도

14.5 °C

To a solution of 2-chlorophenol (3186 g, 24.78 mol) in tetrahydrofuran (14000 mL) at 12° C. was added a 20% potassium t-butoxide solution in tetrahydrofuran (8150 mL, 13.48 mol) over 45 min maintaining an internal temperature between 12-17° C. The solution was warmed to 22° C. and stirred for 1 h before ethyl 2-butynoate (1400 g, 12.48 mol) was added in one portion. The resulting mixture was warmed to 40° C., and stirred for 19.75 h. The reaction mixture was transferred to an extractor and was diluted with methyl t-butyl ether (21 L) and an aqueous 1N aqueous sodium hydroxide solution (14 L). The mixture was stirred and separated and the organic phase washed with an 1N aqueous sodium hydroxide solution (14 L). The aqueous phases were combined and extracted with methyl t-butyl ether (10 L). The organic layer was washed with an 1N aqueous sodium hydroxide solution (7 L). The combined organic phases were washed with a 20% sodium chloride solution (14 L). The solution was evaporated to give (E)-3-(2-chloro-phenoxy)-but-2-enoic acid ethyl ester (96.9% pure by HPLC, 3134 g, 101%) as a light yellow oil.

1. temperatureThe solution was warmed to 22° C.
2. additionwas added in one portion
3. temperatureThe resulting mixture was warmed to 40° C.
4. stirringThe mixture was stirred
5. customseparated
6. washthe organic phase washed with an 1N aqueous sodium hydroxide solution (14 L)
7. extractionextracted with methyl t-butyl ether (10 L)
8. washThe organic layer was washed with an 1N aqueous sodium hydroxide solution (7 L)
9. washThe combined organic phases were washed with a 20% sodium chloride solution (14 L)
10. customThe solution was evaporated

ORD 기록

ord-4fcb37e176b84ebd9332ed816cd4025a

출처 데이터셋

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US07741327B2