Lithium Hydroxide → 2-(4-Methyl-1,1-dioxido-6-(2,4,6-trichlorophenyl)-1,2,6-thiadiazinan-2-yl)acetic acid

Participants

Reaction Steps

To methyl 2-(4-methyl-1,1-dioxido-6-(2,4,6-trichlorophenyl)-1,2,6-thiadiazinan-2-yl)acetate (2.3 g, 5.4 mmol) in THF (12 mL) and MeOH (12 mL), was dropwisely added LiOH (1.1 g, 27.0 mmol) in H2O. The reaction mixture was agitated for 3 hr at room temperature. After the completion of the reaction, the resultant was concentrated and its pH was adjusted down to 3 with 2 N HCl after the addition of water. The resultant was extracted with EtOAc, dried over Na2SO4, filtered and concentrated under reduced pressure, giving the title compound (2.0 g, y=83%, solid). 1H NMR (300 MHz, CDCl3) δ 7.42 (d, J=2.4 Hz, 1H), 7.38 (d, J=2.4 Hz, 1H), 4.53 (d, J=17 Hz, 1H), 4.16-3.88 (m, 4H), 3.40-3.38 (m, 1H), 3.20-3.15 (m, 1H), 2.57-2.11 (m, 1H), 0.93 (d, J=7.1 Hz, 3H).

Provenance & Evidence