Thermal generation of 2-alkyl-3-carbethoxy-cyclopentadienones from angularly alkylated tricyclo[5.2.1.02,6]Decadienones. Their use in the synthesis of cyclopentenoids and dihydrosarkomycins
作者:J.H.M. Lange、A.J.H. Klunder、B. Zwanenburg
DOI:10.1016/s0040-4020(01)86426-7
日期:1991.1
these relatively stable cyclopentadienones with cyclopentadiene gives the novel tricyclodecadienone esters in excellent yields. Regio- and stereospecific enone reduction in with zinc in acetic acid, followed by Flash Vacuum Thermolysis (FVT) leads to cyclopentenoids ( and ) which upon catalytic hydrogenation afford dihydrosarkomycins ( and ) in high overall yields.
角烷基化的2-羰基乙氧基-三环[5.2.1.0 2,6 ]三环癸二烯在155°C的DMF中显示出一种简便而有效的热[4 + 2]-环还原反应,生成2-烷基-3-羰基乙氧基-环戊二烯酮。用环戊二烯捕获这些相对稳定的环戊二烯酮可得到优异的产率的新型三环癸二烯酮酯。用乙酸中的锌还原区域和立体特异性烯酮,然后进行闪蒸真空热解(FVT),生成环戊烯类化合物(和),该环戊烯类化合物在催化氢化后可提供较高的总收率的二氢沙眼霉素(和)。