A Novel Synthesis of (−)-Huperzine A via Tandem Intramolecular Aza-Prins Cyclization–Cyclobutane Fragmentation
作者:James D. White、Yang Li、Jungchul Kim、Miroslav Terinek
DOI:10.1021/ol400012s
日期:2013.2.15
The acetylcholinesterase inhibitor (−)-huperzine A was synthesized from (S)-4-hydroxycyclohex-2-enone in 17 steps by a route that involved two cyclobutane fragmentations. The first of these employed a retro-aldol cleavage to generate the α-pyridone ring of huperzine A, and the second invoked a novel intramolecular aza-Prins reaction in tandem with stereocontrolled scission of a cyclobutylcarbinyl cation