ent-(111S,5R)-15,11-epoxy-11β,12β,14,16α-tetrahydroxy-19β,114-isopropylidenedioxy-5r,6t-dimethyl-(13βH,17βH)-2,8-dioxa-1(12,3)-eudesmana-4(3,2)-pyridina-cyclooctaphane-18,3,8-trione 在
吡啶 、
sodium acetate 作用下,
以
溶剂黄146 为溶剂,
生成
ent-(111S,5R)-11β,12β,16α,18ξ-tetraacetoxy-15,11-epoxy-14,114-dihydroxy-5r,6t-dimethyl-(13βH,17βH)-2,8-dioxa-1(12,3)-eudesmana-4(3,2)-pyridina-cyclooctaphane-19,3,7-trione