Cyclization Approaching to (−)-Lycojapodine A: Synthesis of Two Unnatural Alkaloids
作者:Yu-Rong Yang、Liang Shen、Kun Wei、Qin-Shi Zhao
DOI:10.1021/jo9026534
日期:2010.2.19
Two unnatural alkaloids were observed for the first time while attempting to initiate a plausibly biomimetic cyclization approaching to (−)-lycojapodine A, one of the newest Lycopodium alkaloids.
Asymmetric total synthesis of Lycopodium alkaloid (+)-lycopladine A
作者:Tao Xu、Xiu-Li Luo、Yu-Rong Yang
DOI:10.1016/j.tetlet.2013.03.097
日期:2013.5
Asymmetrictotalsynthesis of (+)-lycopladine A (1) has been achieved. Key elements of the synthesis include an efficient Helquist annulation to assemble the cis-fused 6/5 bicycle, Stille coupling reaction to elongate the allylic side chain, and Kröhnke pyridine synthesis to set the pyridine core at the final stage.
The first enantioselective total synthesis of (−)-8-deoxyserratinine has been achieved in 15 steps fromenone 4 with 7% overall yield. The key features include a highly efficient Helquist annulation to furnish the cis-fused 6/5 bicycle, facile construction of the aza nine-membered ring system employing double N-alkylation strategy, as well as asymmetric Shi epoxidation, delivering the desired β-epoxide