Lithium Hydroxide → HCID 18506878, compound

Participants

Reaction Conditions

Reaction Steps

To a flame dried round bottom flask previously flushed with argon was added N-(5-bromo-thiazol-2-yl)-N-pyridin-2-yl-acetamide (5-5) (50 mg, 1.7 mmol, o-tolylboronic acid (2.6 mmol), potassium phosphate tribasic (108 mg, 5.1 mmol), palladium tetrakistriphenyl phosphine (20 mg, 0.2 mmol), and 3 mL of anhydrous dioxane. The vessel was flushed twice with argon and was heated to 100° C. under Argon. After 20 h workup was performed as follows: The reaction was cooled to ambient temperature and the dioxane was removed via rotary evaporation. The crude mixture was diluted in 1.5 mL CH2Cl2 and 2 mL water, and the resulting biphasic mixture was transferred to a Whatman 12 mL 1PS filter tube. The layers were mixed and the organic layer was drained into a collection tube; the extraction was repeated with an additional 2 mL of CH2Cl2. The organic layer was concentrated and the resulting solid was dissolved in DMSO. Purification was performed via Gilson reverse phase automated column chromatography. Only pure desired fractions were combined into a reaction vessel, contaminated fractions were discarded. An equal portion of methanol was added corresponding to the volume of acetonitrile/water present in the combined samples. LiOH monohydrate (5.0 eq.) was added to the stirred solution. The reaction was complete via MS within 10 min or less after the addition of the LiOH. The reaction was concentrated to almost complete dryness. The product was obtained as a precipitate which was filtered, washed with water, and dried. 1H NMR (CDCl3): δ 8.38 (d, 1H, J=4.2 Hz), 7.68 (t, 1H, J=7.5 Hz), 7.42 (d, 1H, J=9.7 Hz), 7.33 (s, 1H), 7.27-7.31 (m, 3H), 7.08 (d, 1H, J=8.2 Hz), 6.97 (t, 1H, J=4.9 Hz), 2.46 (s, 3H). Mp: 155-160° C. MS [M+H]+=268.0.

Provenance & Evidence