6 gave the endo- and exo-diols 10 and 8. Acetalation of 8 furnished the bis(dioxolane) 11. Reduction of ketone 9 gave the trans-diol 12. Deblocking of 8 and 12 led the tetrol 15 or pentols 16 and 14. The structure of tetrol 4 was confirmed by X-ray diffraction. Compounds 4, 5 and 16 were devoid of antitumor or antiviral activity.
endo-5,6-exo-2,3-syn-7-降
冰片戊醇(5),endo-5-exo-2,3,6-syn-7-降
冰片戊醇(14)和7-exo-描述了2,3,5,6-降
冰片戊醇(16)。
7-叔丁氧基降冰片二烯(1)的顺式羟基氧化反应得到外二醇,内二醇3和四醇4。将后者脱保护得到
戊醇5。氧化烯烃6得到二酸7和两种次要产物:外二醇8和α-羟基酮9。顺式羟基化6得到内二醇和外二醇10和8。酯化8提供双(二
氧戊环)11。还原酮9得到反式二醇12。在图8和图12中,戊四醇15或
戊醇16和14处于主导地位。通过X射线衍射证实了戊四醇4的结构。化合物4、5和16没有抗肿瘤或抗病毒活性。