Alkaloid synthesis via the intramolecular imidate methylide 1,3-dipolar cycloaddition reaction
作者:Richard Smith、Tom Livinghouse
DOI:10.1016/s0040-4020(01)96709-2
日期:1985.1
A concise synthesis for the neurotoxic physostigmine alkaloid d,l-eserethole is described which relys upon an intramolecular cycloaddition reaction involving a “non-stabilized” imidate methylide and an unactivated alkene. The facility of this cyclization is enhanced by the rigid alignment inforced upon the dipole and dipolarophile by their ortho-disposition on an aryl nucleus. The synthetic limitations