New approaches for the synthesis of erythrinan alkaloids
作者:Fengzhi Zhang、Nigel S. Simpkins、Alexander J. Blake
DOI:10.1039/b900189a
日期:——
A concise asymmetric total synthesis of (+)-erysotramidine is described, using chiral base desymmetrisation of a meso-imide, N-acyliminium addition, retro-Diels–Alder cycloaddition and radical cyclisation as the key steps. A related route, starting from a cyclobutene-fused imide, was explored, and established a novel construction of the Erythrina alkaloid skeleton using a key ring-opening/ring-closing