Premium
Synthesis of Pyranthiones
Author(s) -
Van Allan J. A.,
Reynolds G. A.,
Stenberg J. F.
Publication year - 1979
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570160832
Subject(s) - chemistry , isocyanate , yield (engineering) , tosyl , xanthone , sulfide , butylamine , organic chemistry , hydrogen sulfide , amine gas treating , sulfur , polyurethane , materials science , metallurgy
A general method for the preparations of pyranthiones is particularly useful for preparing substituted xanthiones which are unavailable by established procedures. Reaction of a xanthone with p ‐tosyl isocyanate or with trichloroacetyl isocyanate produces the corresponding imino derivatives, which upon treatment with n ‐butylamine followed by hydrogen sulfide gives the desired xanthione in good yield.