Patent ID: 6037468
Filing Date: 2000-03-14
Classification: C07C,C07D

Abstract:
A process for the stereoselective preparation of pyranosylated indolocarbazoles of the formula ##STR26## by ring expansion of the corresponding furanosylated indolocarbazole of the formula ##STR27## in the presence of a Bronsted acid or a Lewis acid, wherein R is selected from the group consisting ofa) a C.sub.3-10 branched or unbranched alkyl, optionally partially or fully halogenated, hydroxy, C.sub.1-3 alkyloxy, amino, alkylamino,b) an aryl optionally substituted with one to five groups consisting of halo, hydroxy, C.sub.1-3 alkyloxy;c) a hydrogen;d) a halogen; ande) mixtures of any of these.