C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/357.8
C07D 311/86 (2006.01)
Patent
CA 1126282
ABSTRACT OF THE DISCLOSURE: A process for the preparation of xanthone der-ivatives of general formula I: (I) Image wherein R represents a hydrogen atom or an alkyl radical containing from 1 to 9 carbon atoms and R1 represents an alkyl radical containing from 1 to 5 carbon atoms,which comprises cyclising a compound of formula II: Image (II) wherein R and R1 are defined above and R2 and R3, which may be the same or different, each represents an esterifying group, followed, if required, by hydrolysis to the free acid. The compounds obtained thereby possess interesting anti-allergic activity.
322692
Barnes Alan C.
Ramm Peter J.
Robic Robic & Associes/associates
Roussel-Uclaf
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