?Nichtcarbenoide? Zwischenstufen bei der Fragmentierung von ?-Cyclopropyltosylhydrazonen
作者:G. Ohloff、W. Pickenhagen
DOI:10.1002/hlca.19710540706
日期:1971.11.1
The sodium salts of the tricyclic tosylhydrazones 1, 4 and 5 yield by base-catalyzed fragmentation between 130–160° the monocyclic ring expansion products 2, 3 and 6. IR.-spectrometry suggests a diazoalkane A as the principal intermediate of the fragmentation. Besides the known carbene mechanism the reaction is considered to pass through a noncarbenoid intermediate.
Tricyclo[5.3.1.0]undecanols were transformed to bicyclo[5.3.1]undecanols in good yield by using pyridinium chlorochromate.
使用氯铬酸吡啶鎓将三环[5.3.1.0]十一烷醇以良好的收率转化为双环[5.3.1]十一烷醇。
Photoselective bond cleavage of tricyclo[5.3.1.01,7]undecane derivatives. A facile entry to carbocyclic taxane [A,B] ring system
作者:Janine Cossy、Samir BouzBouz
DOI:10.1016/s0040-4039(97)00249-9
日期:1997.3
The selective control cyclopropyl bond cleavage of tricyclo[5.3.1.01,7]undecan-2-one by photochemical electron transfer produces a new approach to the construction of the carbon skeleton of the [A,B] ringsystem of the carbocyclic frame of taxane.