Preparation of tetrahydrodibenzocyclooctene lignans and spirodienones by hypervalent iodine oxidation of phenolic dibenzylbutyrolactones.
作者:Robert S. Ward、Andrew Pelter、Atef Abd-El-Ghani
DOI:10.1016/0040-4020(95)00960-4
日期:1996.1
Treatment of the dibenzylbutyrolactone 18 with Phl(OCOCF3)2 in trifluoroethanol gives as the major product either the spirodienone 28 or the tetrahydrodibenzocyclooctene 29, depending upon the length of time allowed for the reaction. Reaction of a second dibenzylbutyrolactone 19 under the same conditions gives the products 33, 34, 36 and 38, while 20 gives 43 directly. These reactions provide the first
根据在反应中允许的时间长度,在三氟乙醇中用Phl(OCOCF 3)2处理二苄基丁内酯18,主要产物为螺二烯酮28或四氢二苯并环辛烯29。第二dibenzylbutyrolactone的反应19相同的条件下给出的产品33,34,36和38,而20给出了43直接。这些反应提供了螺二烯酮如28和33的第一批合成物,被假定为四氢二苯并环辛烯木脂素生物合成的中间体。