Radical cyclization strategies to terpenoids; syntheses of (±)-β-cuparenone, (±)-laurene and epilaurenes
作者:A. Srikrishna、G. Sundarababu
DOI:10.1016/s0040-4020(01)90504-6
日期:1991.1
Radical cyclization of the bromide , obtained in 5 steps from the ketone , furnished exclusively 6-endo trig cyclization with out any observable amount of 5-exo trig product . 5-Exo dig radical cyclizatlon of the bromo acetate , prepared from the aldehyde , followed by routine transformations furnished the cyclopentenone , an immediate precursor to β-cuparenone (). Similarly, total synthesis of laurenes
从酮中分5步获得的溴化物的自由基环化仅提供6-内-trig环化,而没有任何可观察到的5-exo trig产物。由醛制得的乙酸溴的5-Exo dig自由基环氮杂苯,然后进行常规转化,得到了β-cuparenone()的直接前体-环戊烯酮。类似地,月桂酸酯的全合成并实现了从醛获得的黄原酸酯的5-exo dig自由基环化。