反应详情

To a solution of (S)-tert-butyl (1-(2-benzoylhydrazinyl)-1-oxopropan-2-yl)carbamate (155 mg, 0.5 mmol, 1.0 equv. in 5 ml of THF) was added Lawesson's reagent (36.4 mg, 0.5 mmol, 1.0 equv.) the reaction mixture was stirred at reflux for 3 hours, the reaction mixture was filtered and the solvent was removed to yield the crude product. Silica gel column chromatography (ethyl acetate in heptane 10 to 50%) to provide (S)-tert-butyl (1-(5-phenyl-1,3,4-thiadiazol-2-yl)ethyl)carbamate (114.6 mg, white solid) in 70.7% yield. 1H NMR (400 MHz, CD2Cl2) δ 7.94-7.72 (m, 2H), 7.52-7.26 (m, 3H), 5.59 (b, 1H), 5.11 (b, 1H), 1.57 (d, J=7.0 Hz, 3H), 1.34 (s, 9H).

1. temperatureat reflux for 3 hours
2. filtrationthe reaction mixture was filtered
3. customthe solvent was removed
4. customto yield the crude product