Lawesson's reagent → 4-isopropoxycarbonyl-3-(R,S)-phenyl-3,4-dihydro-1,4,5-triazanaphthalene-2(1H)-thione

Participants

Reaction Steps

200 mg (0.64 mmol) of 4-isopropoxycarbonyl-3-(R,S)-phenyl-3,4-dihydro-1,4,5-triazanaphthalen-2(1H)-one were reacted with 400 mg of Lawesson's reagent in analogy to Example 20 (reaction conditions: 10 hours at 80° C. The crude product was concentrated and chromatographed on silica gel (ethyl acetate/n-heptane=1:2). 130 mg (62%) of 4-isopropoxycarbonyl-3-(R,S)-phenyl-3,4-dihydro-1,4,5-triazanaphthalene-2(1H)-thione, of melting point 188°-189° C., were obtained.

Provenance & Evidence