Triphosgene → HCID 136338031, compound

Participants

Reaction Steps

5-Amino-4-(1H-pyrazol-5-yl)thiophene-2-carbaldehyde (12 mg, 0.06 mmol) and bis(trichloromethyl)carbonate (55 mg, 0.19 mmol) were dissolved in toluene (3 mL) and THF (0.5 mL), and the reaction heated in a sealed tube at 100° C. for 3 h. The reaction was cooled to room temperature, hexanes (10 mL) added, suspension stirred at room temperature for 30 min, precipitate washed with additional hexanes (10 mL), dried under reduced pressure to yield 5-oxo-4,5-dihydropyrazolo[1,5-c]thieno[3,2-e]pyrimidine-2-carbaldehyde as a powder (11 mg, 81%). 1H NMR (400 MHZ, DMSO-d6) δ 6.99 (s, 1H), 8.12 (s, 1H), 8.45 (s, 1H), 9.93 (s, 1H), 13.06 (s, 1H).

Provenance & Evidence