ent-3α-acetoxy-13-hydroxy-gibberella-1,16-dien-7-oic acid 7-mehyl ester 19,10-lactone 在
间氯过氧苯甲酸 作用下,
以
氯仿 为溶剂,
以1.5 g的产率得到methyl (1'S,2S,2'S,4a'R,4b'R,7'S,9a'R,10'S,10a'R)-2'-acetoxy-7'-hydroxy-1'-methyl-13'-oxo-1',2',4b',5',6',7',10',10a'-octahydro-9'H-spiro[oxirane-2,8'-[4a,1](epoxymethano)[7,9a]methanobenzo[a]azulene]-10'-carboxylate