Ring expansion with four C atoms by tandem (2 + 2)cycloaddition and electrocyclic ring opening
作者:Gertruda J. M. Vos、David N. Reinhoudt、Piet H. Benders、Sybolt Harkema、Gerrit J. van Hummel
DOI:10.1039/c39850000661
日期:——
A four-carbon ringexpansion is presented which involves reaction of enamines of cyclicketones with methylpropiolate followed by reaction of the resulting cis,cis-cycloalkadienes, also containing an ‘enamine’ type of double bond, with dimethyl acetylenediacarboxylate (DMAD).