Mv. Denisenko et al., RUTHENIUM TETROXIDE OXIDATION OF 3-BETA-ACETOXY-28-HYDROXY-18-LUPENE TO TRICYCLIC PRODUCTS, Tetrahedron letters, 37(29), 1996, pp. 5187-5190
By gradual addition 3 beta-acetoxy-28-hydroxy-18-lupene with stirring
at similar to 50 degrees C EtOAc-H2O biphase system, containing F3CCOO
H and RuO4, regenerated in situ from RuO2 . xH(2)O and NaIO4, satisfac
tory yields of 3 -28-nor-17,18;18,19-disecolupaan-17,19-dion-18-oic ac
id and 3 -19,20,21,22,28,29,30-heptanor-17,18-secolupan-17, 18-dioic a
cid were obtained. Copyright (C) 1996 Elsevier Science Ltd