The dehydrogenative coupling of maleic acids with alkynes proceeds smoothly accompanied by decarboxylation under rhodium catalysis to produce variously substituted a-pyrone derivatives. The catalyst system is also applicable to the coupling with 1,3-diynes and alkenes.
Rhodium(<scp>iii</scp>)-catalysed decarbonylative coupling of maleic anhydrides with alkynes
作者:Takanori Matsuda、Kentaro Suzuki
DOI:10.1039/c4ra06452f
日期:——
A formal [5 − 1 + 2] annulation for the preparation of substituted α-pyrones is reported. The reaction involves the decarbonylative coupling of substituted maleicanhydrides with internal alkynes in the presence of a rhodium(III) catalyst and a copper(II) salt, affording tri- and tetrasubstituted α-pyrones.