Total Synthesis of Neo-Tanshinlactones through a Cascade Benzannulation-Lactonization as the Key Step
作者:Ketaki Ghosh、Raju Karmakar、Dipakranjan Mal
DOI:10.1002/ejoc.201300102
日期:2013.7
The cascade annulation-lactonization of phthalides with α-carboxyfurylacrylates in the presence of lithium hexamethyldisilazide (LiHMDS) provides both convergent and semiconvergent regioselective syntheses of neo-tanshinlactones in moderate yields. This methodology also offers an avenue for the direct syntheses of hitherto unreported 6-alkoxycarbonyl-substituted neo-tanshinlactones and their heterocyclic