Asymmetric Synthesis of Tetrahydropalmatine via Tandem 1,2-Addition/Cyclization
作者:Marine Boudou、Dieter Enders
DOI:10.1021/jo051554t
日期:2005.11.1
The enantioselective synthesis of both enantiomers of tetrahydropalmatine (2) (ee = 98%), a natural alkaloid belonging to the tetrahydroprotoberberine family, is described. The key step of this totalsynthesis is based on our tandem 1,2-addition/ring-closure methodologyemploying lithiated methylbenzamide and benzaldehyde SAMP or RAMPhydrazones as substrates. An initial route was investigated for