tert-Butyl methyl ether → 1-(5-Amino-3-bromo-1,2-thiazol-4-yl)ethan-1-one

Add bromine (195; mL, 3.81; mol) over 10; min to a heated solution of 2-cyano-3-oxo-thiobutyramide (550; g, 3.86; mol) in glacial acetic acid (5.80; L) at 40° C. and stir at room temperature for 15; h. Filter the reaction mixture, wash the collected solid with water and dry overnight under vacuum to give a dark red solid (1151; g). Slurry the solid with stirring in a saturated aqueous solution of sodium bicarbonate (8; L) for 30; min and filter. Wash the collected solid with water and dry overnight under vacuum to give a dark red solid (1022; g). Slurry the solid with stirring with methyl t-butyl ether (5.90; L) over 1 hour, filter and retain the filtrate. Repeat the above methyl t-butyl ether extraction process twice on recovered solid retaining the filtrate after each extraction. Combine the filtrates and concentrate to give the title compound as a yellow solid which is carried on without further purification (598; g, 72%). MS (m/z): 221, 223; (M+1).

1. filtrationFilter the reaction mixture
2. washwash the collected solid with water
3. customdry overnight under vacuum
4. customto give a dark red solid (1151; g)
5. filtrationmin and filter
6. washWash the collected solid with water
7. customdry overnight under vacuum
8. customto give a dark red solid (1022; g)
9. filtrationfilter
10. extractionRepeat the above methyl t-butyl ether extraction process twice
11. customon recovered solid
12. extractionafter each extraction
13. concentrationconcentrate

ORD record

ord-d2713c6507cb400699e1e57218bf0502

Source dataset

uspto-grants-2011_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07932274B2