Synthetic studies toward the kempane diterpenes. Construction of a key tricyclic intermediate
作者:Guanglin Bao、Liang Zhao、D. Jean Burnell
DOI:10.1039/b509777k
日期:——
A synthetic sequence is described for construction of the tricyclic portion (35) of kempanediterpenes. The central stereochemistry was established by a Diels-Alder addition of 2,6-dimethyl-para-benzoquinone to a 5-membered, dithiane-protected diene, and the addition of acetylide, with very high chemoselectivity, provided a suitably functionalized handle that will be incorporated into the final seven-membered