A New Route toward 7-Oxo-13-hydroxy-8,11,13-podocarpatrienes from Labdane Diterpenes
作者:Enrique Alvarez-Manzaneda Roldán、Juan Luis Romera Santiago、Rachid Chahboun
DOI:10.1021/np0502847
日期:2006.4.1
Trinorlabdane 1,5-diketones (7, 10a, b, 13a,b), which are easily prepared from labdane diterpenes, are directly converted into the corresponding 7-oxo-13-hydroxy-8,11,13-podocarpatrienes, immediate precursors of bioactive compounds, under basic treatment. Utilizing this strategy, the first enantiospecific synthesis of 13-hydroxy-8,11,13-podocarpatriene (20), a constituent of Taiwania cryptomerioides, was achieved starting from (-)- sclareol ( 5) after a seven-step sequence in 55% overall yield.