Competition between ester and formyl groups for control of torquoselectivity in cyclobutene electrocyclic reactions
作者:Satomi Niwayama、K.N. Houk
DOI:10.1016/s0040-4039(00)91566-1
日期:1992.2
Methyl 3-formylcyclobutene-3-carboxylate was synthesized in five steps from commercially available cyclobutane-1,1-dicarboxylic acid. Thermolysis afforded methyl (2H)-pyrane-5-carboxylate, which was formed by electrocyclization of the formyl-in, ester-out product of ring opening. This confirms theoretical predictions.