Efficient access to isomeric 2,3-dihydroxy lupanes: first synthesis of alphitolic acid
作者:Jia Hao、Xueli Zhang、Pu Zhang、Jun Liu、Luyong Zhang、Hongbin Sun
DOI:10.1016/j.tet.2009.07.047
日期:2009.9
Alphitolic acid (3) is a naturally occurring lupane type of pentacyclic triterpene, which possesses various pharmacological properties. Efficient synthesis of 3 has been accomplished in 10 steps with an overall yield of 19% starting from the readily available diketone 11. An alternative approach to the key intermediate 17 has also been developed, and based on this approach, 3 could be obtained in 10