反应详情

温度

80 °C

2-Chloroethylammonium chloride (Entry 1) was reacted with 4-nitrophenyl isothiocyanate according to Method C1a to give 2-(4-nitrophenyl)-1,3-thiazolidine. The thiazolidine was reacted with 1-bromo-2-methyl-2-propene according to Method D2a to give 2-(4-nitrophenylimino)-3-(2-methylprop-2-en-1-yl)-1,3-thiazolidine. A mixture of 2-(4-nitrophenylimino)-3-(2-methylprop-2-en-1-yl)-1,3-thiazolidine (0.20 g) in poly(phosphoric acid) (0.4 mL) was heated at 80 ° C. for 5 h. The reaction mixture was then dissolved in 0 ° C. water (20 mL) with the aid of sonication. The aqueous mixture was adjusted to pH 12 with a 1N NaOH solution, then extracted with EtOAc (3×25 mL). The combined organic phases were dried (K2CO3) and concentrated under reduced pressure. The residue (0.21 g) was purified by preparative HPLC to afford 2-(4-nitrophenylimino)-3-(2-methylprop-1-en-1-yl)-1,3-thiazolidine.

1. customwith the aid of sonication
2. extractionextracted with EtOAc (3×25 mL)
3. dry with materialThe combined organic phases were dried (K2CO3)
4. concentrationconcentrated under reduced pressure
5. customThe residue (0.21 g) was purified by preparative HPLC