Strong base-induced intramolecular cycloaddition of homophthalic anhydrides: an efficient synthesis of polycyclic peri-hydroxy aromatic compounds
摘要:
A strong-base-induced intramolecular cycloaddition reaction of homophthalic anhydrides has been examined as a method for preparing nonlinear polycyclic peri-hydroxy aromatic compounds.
Reactions of some alkynyl halides with Samarium(II) iodide
作者:Zhihong Zhou、Denis Larouche、Sharon M. Bennett
DOI:10.1016/0040-4020(95)00703-b
日期:1995.10
Certain alkynyl halides (6-halo-1-ynes) react with samarium(II) iodide (SmI2) to give cyclized products (methylenecyclopentanes) in good yield. We have found some interesting evidence for the presence of radical and unstable organosamarium intermediates in these reductive cyclizations. Methyl 7-halohept-2-ynoates are not. however, good substrates for this cyclization methodology.