The influence of hydrate formation on the Clemmensen reduction of pentacyclo [5.4.0.02,6.03,10.05,9]undecane-8,11-dione and pentacyclo[6.4.0.02,7.03,11.06,10]dodecane-9,12-dione
作者:Frans J.C. Martins、Agatha M. Viljoen、Marinda Coetzee、Louis Fourie、Philuphus L. Wessels
DOI:10.1016/s0040-4020(01)96209-x
日期:1991.11
Hydration of pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione led to the formation of a mixture of a geminal diol (80%) and a transannular hydrate (20%) and not to only the latter as previously accepted. Compounds with smaller intercarbonylic distances formed only transannular hydrates which promoted rearrangement reactions during Clemmensen reduction. The trans= annular hydrate of pentacyclo[6.4.0.02
五环[5.4.0.0 2,6 .0 3,10 .0 5,9 ]十一烷-8,11-二酮的水合导致双酚(80%)和跨环水合物(20%)的混合物形成),而不仅限于先前接受的后者。羰基间距离较小的化合物仅形成跨环的水合物,在Clemmensen还原过程中会促进重排反应。五环[6.4.0.0 2,7 .0 3,11 .0 6,10 ]十二烷-9,12-二酮的反式环状水合物生产的五环[6.4.0.0 2,6 .0 5,9 .0 4, 12 ] -2-十二烷醇。