Synthesis of coruscanones A and B, metabolites of Piper coruscans, and related compounds
作者:O. P. Shestak、V. L. Novikov
DOI:10.1007/s11172-010-0048-9
日期:2010.1
Base-catalyzed rearrangements of both individual 4-(acylmethylidene)butenolides and their mixtures prepared by condensation of citraconic anhydride with various phosphoranes occur successfully only in the presence of 5.2% MeONa in MeOH (molar ratio MeONa: substrate ≤ 10: 1, room temperature, 1–2 h). Under these conditions, the yields of 2-cinnamoyl-4-methylcyclopent-4-ene-1,3-dione (coruscanone B)