Synthesis of betulin derivatives with solid supported reagents
Betulin–allobetulin transformation is effected with ferric nitrate or ferric chloride adsorbed
onto silica gel or alumina, in excellent yields. In addition, allobetulin can be converted to
allobetulone with silica adsorbed ferric nitrate or to 19β, 28-epoxy-A-neo-18α-olean-3 (5)-
ene and 19β, 28-epoxy-A-neo-5β-methyl-25-nor-18α-olean-9-ene with silica or alumina
adsorbed ferric chloride.
onto silica gel or alumina, in excellent yields. In addition, allobetulin can be converted to
allobetulone with silica adsorbed ferric nitrate or to 19β, 28-epoxy-A-neo-18α-olean-3 (5)-
ene and 19β, 28-epoxy-A-neo-5β-methyl-25-nor-18α-olean-9-ene with silica or alumina
adsorbed ferric chloride.
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